1. 01 Dec, 2016 4 commits
    • David Ahern's avatar
      perf sched timehist: Add option to specify time window of interest · 853b7407
      David Ahern authored
      Add option to allow user to control analysis window. e.g., collect data
      for time window and analyze a segment of interest within that window.
      
      Committer notes:
      
      Testing it:
      
        # perf sched record -a usleep 1
        [ perf record: Woken up 1 times to write data ]
        [ perf record: Captured and wrote 1.593 MB perf.data (25 samples) ]
        #
        # perf sched timehist | head -18
        Samples do not have callchains.
                time    cpu   task name       wait time  sch delay  run time
                              [tid/pid]          (msec)     (msec)    (msec)
        ------------- ------  --------------- ---------  ---------  --------
         19818.635579 [0002]  <idle>              0.000      0.000     0.000
         19818.635613 [0000]  perf[9116]          0.000      0.000     0.000
         19818.635676 [0000]  <idle>              0.000      0.000     0.063
         19818.635678 [0000]  rcuos/2[29]         0.000      0.002     0.001
         19818.635696 [0002]  perf[9117]          0.000      0.004     0.116
         19818.635702 [0000]  <idle>              0.001      0.000     0.024
         19818.635709 [0002]  migration/2[25]     0.000      0.003     0.012
         19818.636263 [0000]  usleep[9117]        0.005      0.000     0.560
         19818.636316 [0000]  <idle>              0.560      0.000     0.053
         19818.636358 [0002]  <idle>              0.129      0.000     0.649
         19818.636358 [0000]  usleep[9117]        0.053      0.002     0.042
        #
      
        # perf sched timehist --time 19818.635696,
        Samples do not have callchains.
                 time    cpu  task name       wait time  sch delay  run time
                              [tid/pid]          (msec)     (msec)    (msec)
        ------------- ------  ---------------  --------  --------- ---------
         19818.635696 [0002]  perf[9117]          0.000      0.120     0.000
         19818.635702 [0000]  <idle>              0.019      0.000     0.006
         19818.635709 [0002]  migration/2[25]     0.000      0.003     0.012
         19818.636263 [0000]  usleep[9117]        0.005      0.000     0.560
         19818.636316 [0000]  <idle>              0.560      0.000     0.053
         19818.636358 [0002]  <idle>              0.129      0.000     0.649
         19818.636358 [0000]  usleep[9117]        0.053      0.002     0.042
        #
        # perf sched timehist --time 19818.635696,19818.635709
        Samples do not have callchains.
                 time    cpu  task name       wait time  sch delay  run time
                              [tid/pid]          (msec)     (msec)    (msec)
        ------------- ------  --------------- ---------  --------- ---------
         19818.635696 [0002]  perf[9117]          0.000      0.120     0.000
         19818.635702 [0000]  <idle>              0.019      0.000     0.006
         19818.635709 [0002]  migration/2[25]     0.000      0.003     0.012
         19818.635709 [0000]  usleep[9117]        0.005      0.000     0.006
        #
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/1480439746-42695-5-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      853b7407
    • David Ahern's avatar
      perf script: Add option to specify time window of interest · a91f4c47
      David Ahern authored
      Add option to allow user to control analysis window. e.g., collect data
      for some amount of time and analyze a segment of interest within that
      window.
      
      Committer notes:
      
      Testing it:
      
        # perf evlist -v
        cycles:ppp: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|CALLCHAIN|CPU|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1, precise_ip: 3, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1
        #
        # perf script --hide-call-graph | head -15
          swapper    0 [0] 9693.370039:      1 cycles:ppp: ffffffffb90072ad x86_pmu_enable (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [0] 9693.370044:      1 cycles:ppp: ffffffffb900ca1b intel_pmu_handle_irq (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [0] 9693.370046:      7 cycles:ppp: ffffffffb902fd93 native_sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [0] 9693.370048:    126 cycles:ppp: ffffffffb902fd93 native_sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [0] 9693.370049:   2701 cycles:ppp: ffffffffb902fd93 native_sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [0] 9693.370051:  58823 cycles:ppp: ffffffffb90cd2e0 idle_cpu (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [1] 9693.370059:      1 cycles:ppp: ffffffffb91a713a ctx_resched (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [1] 9693.370062:      1 cycles:ppp: ffffffffb900ca1b intel_pmu_handle_irq (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [1] 9693.370064:     13 cycles:ppp: ffffffffb902fd93 native_sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [1] 9693.370065:    250 cycles:ppp: ffffffffb902fd93 native_sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [1] 9693.370067:   5269 cycles:ppp: ffffffffb902fe79 sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [1] 9693.370069: 114602 cycles:ppp: ffffffffb90c1c5a atomic_notifier_call_chain (.../4.8.8-300.fc25.x86_64/vmlinux)
             perf 5124 [2] 9693.370076:      1 cycles:ppp: ffffffffb91a76c1 __perf_event_enable (.../4.8.8-300.fc25.x86_64/vmlinux)
             perf 5124 [2] 9693.370091:      1 cycles:ppp: ffffffffb900ca1b intel_pmu_handle_irq (.../4.8.8-300.fc25.x86_64/vmlinux)
             perf 5124 [2] 9693.370095:      3 cycles:ppp: ffffffffb902fd93 native_sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
        #
        # perf script --hide-call-graph --time ,9693.370048
          swapper    0 [0] 9693.370039:      1 cycles:ppp: ffffffffb90072ad x86_pmu_enable (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [0] 9693.370044:      1 cycles:ppp: ffffffffb900ca1b intel_pmu_handle_irq (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [0] 9693.370046:      7 cycles:ppp: ffffffffb902fd93 native_sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
        # perf script --hide-call-graph --time 9693.370064,9693.370076
          swapper    0 [1] 9693.370064:     13 cycles:ppp: ffffffffb902fd93 native_sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [1] 9693.370065:    250 cycles:ppp: ffffffffb902fd93 native_sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [1] 9693.370067:   5269 cycles:ppp: ffffffffb902fe79 sched_clock (.../4.8.8-300.fc25.x86_64/vmlinux)
          swapper    0 [1] 9693.370069: 114602 cycles:ppp: ffffffffb90c1c5a atomic_notifier_call_chain (.../4.8.8-300.fc25.x86_64/vmlinux)
        #
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/1480439746-42695-4-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      a91f4c47
    • David Ahern's avatar
      perf tools: Move parse_nsec_time to time-utils.c · c284d669
      David Ahern authored
      Code move only; no functional change intended.
      
      Committer notes:
      
      Fix the build on Ubuntu 16.04 x86-64 cross-compiling to S/390, with this
      set of auto-detected features:
      
        ...                         dwarf: [ on  ]
        ...            dwarf_getlocations: [ on  ]
        ...                         glibc: [ on  ]
        ...                          gtk2: [ OFF ]
        ...                      libaudit: [ OFF ]
        ...                        libbfd: [ OFF ]
        ...                        libelf: [ on  ]
        ...                       libnuma: [ OFF ]
        ...        numa_num_possible_cpus: [ OFF ]
        ...                       libperl: [ OFF ]
        ...                     libpython: [ OFF ]
        ...                      libslang: [ OFF ]
        ...                     libcrypto: [ OFF ]
        ...                     libunwind: [ OFF ]
        ...            libdw-dwarf-unwind: [ on  ]
        ...                          zlib: [ on  ]
        ...                          lzma: [ OFF ]
        ...                     get_cpuid: [ OFF ]
        ...                           bpf: [ on  ]
      
      Where it was failing with:
      
          CC       /tmp/build/perf/util/time-utils.o
        util/time-utils.c: In function 'parse_nsec_time':
        util/time-utils.c:17:13: error: implicit declaration of function 'strtoul' [-Werror=implicit-function-declaration]
          time_sec = strtoul(str, &end, 10);
                     ^
        util/time-utils.c:17:2: error: nested extern declaration of 'strtoul' [-Werror=nested-externs]
          time_sec = strtoul(str, &end, 10);
          ^
        util/time-utils.c: In function 'perf_time__parse_str':
        util/time-utils.c:93:2: error: implicit declaration of function 'free' [-Werror=implicit-function-declaration]
          free(str);
          ^
        util/time-utils.c:93:2: error: incompatible implicit declaration of built-in function 'free' [-Werror]
        util/time-utils.c:93:2: note: include '<stdlib.h>' or provide a declaration of 'free'
      
      Do as suggested and add a '#include <stdlib.h>' to get the free() and strtoul()
      declarations and fix the build.
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/1480439746-42695-3-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      c284d669
    • David Ahern's avatar
      perf tools: Add time-based utility functions · fdf9dc4b
      David Ahern authored
      Add function to parse a user time string of the form <start>,<stop>
      where start and stop are time in sec.nsec format. Both start and stop
      times are optional.
      
      Add function to determine if a sample time is within a given time
      time window of interest.
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/1480439746-42695-2-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      fdf9dc4b
  2. 29 Nov, 2016 7 commits
    • David Ahern's avatar
      perf script: Add option to stop printing callchain · 64eff7d9
      David Ahern authored
      Allow user to specify list of symbols which cause the dump of callchains
      to stop at that symbol.
      
      Committer notes:
      
      Testing it:
      
        # perf record -ag usleep 1
        [ perf record: Woken up 1 times to write data ]
        [ perf record: Captured and wrote 1.177 MB perf.data (33 samples) ]
        #
        # # Without it:
        #
        # perf script
        swapper   0 [000]  9693.370039:          1 cycles:ppp:
                        2072ad x86_pmu_enable (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a29d7 perf_pmu_enable.part.90 (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a713a ctx_resched (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a76c1 __perf_event_enable (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a0390 event_function (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a1cff remote_function (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        326978 flush_smp_call_function_queue (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        327413 generic_smp_call_function_single_interrupt (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        249b37 smp_call_function_single_interrupt (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        a04b2c call_function_single_interrupt (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        889427 cpuidle_enter (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        2e534a call_cpuidle (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        2e5730 cpu_startup_entry (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        9f5167 rest_init (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                       137ffeb start_kernel ([kernel.vmlinux].init.text)
                       137f2ca x86_64_start_reservations ([kernel.vmlinux].init.text)
                       137f419 x86_64_start_kernel ([kernel.vmlinux].init.text)
      
        swapper   0 [000]  9693.370044:          1 cycles:ppp:
                        20ca1b intel_pmu_handle_irq (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        205b0c perf_event_nmi_handler (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        22a14a nmi_handle (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        22a6b3 default_do_nmi (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        22a83c do_nmi (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        a03fb1 end_repeat_nmi (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a29d7 perf_pmu_enable.part.90 (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a713a ctx_resched (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a76c1 __perf_event_enable (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a0390 event_function (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a1cff remote_function (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        326978 flush_smp_call_function_queue (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        327413 generic_smp_call_function_single_interrupt (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        249b37 smp_call_function_single_interrupt (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        a04b2c call_function_single_interrupt (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        889427 cpuidle_enter (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        2e534a call_cpuidle (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        2e5730 cpu_startup_entry (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        9f5167 rest_init (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                       137ffeb start_kernel ([kernel.vmlinux].init.text)
                       137f2ca x86_64_start_reservations ([kernel.vmlinux].init.text)
        #
        # # Using it to see just what are the calls from the 'remote_function' function:
        #
        # perf script --stop-bt remote_function
        swapper   0 [000]  9693.370039:          1 cycles:ppp:
                        2072ad x86_pmu_enable (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a29d7 perf_pmu_enable.part.90 (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a713a ctx_resched (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a76c1 __perf_event_enable (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a0390 event_function (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a1cff remote_function (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
      
        swapper   0 [000]  9693.370044:          1 cycles:ppp:
                        20ca1b intel_pmu_handle_irq (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        205b0c perf_event_nmi_handler (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        22a14a nmi_handle (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        22a6b3 default_do_nmi (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        22a83c do_nmi (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        a03fb1 end_repeat_nmi (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a29d7 perf_pmu_enable.part.90 (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a713a ctx_resched (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a76c1 __perf_event_enable (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a0390 event_function (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
                        3a1cff remote_function (/usr/lib/debug/lib/modules/4.8.8-300.fc25.x86_64/vmlinux)
      Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/1480104021-36275-1-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      64eff7d9
    • David Ahern's avatar
      perf kmem stat: Track memory freed · aa58e9af
      David Ahern authored
      Track freed memory as well as allocations and show the net in the
      summary.
      
      Committer notes:
      
      Testing it:
      
        # perf kmem record usleep 1
        [ perf record: Woken up 0 times to write data ]
        [ perf record: Captured and wrote 1.626 MB perf.data (4208 samples) ]
        [root@jouet ~]# perf kmem stat --slab
      
        SUMMARY (SLAB allocator)
        ========================
        Total bytes requested: 234,011
        Total bytes allocated: 234,504
        Total bytes freed:     213,328                                 <------
        Net total bytes allocated: 21,176
        Total bytes wasted on internal fragmentation: 493
        Internal fragmentation: 0.210231%
        Cross CPU allocations: 4/1,963
        #
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/1480110133-37039-1-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      aa58e9af
    • Arnaldo Carvalho de Melo's avatar
      perf test: Remove "test" and similar strings from test descriptions · 030910c0
      Arnaldo Carvalho de Melo authored
      Having "test" in almost all test descriptions is redundant, simplify it
      removing and rewriting tests with such descriptions.
      
      End result:
      
        # perf test
         1: vmlinux symtab matches kallsyms            : Ok
         2: Detect openat syscall event                : Ok
         3: Detect openat syscall event on all cpus    : Ok
         4: Read samples using the mmap interface      : Ok
         5: Parse event definition strings             : Ok
         6: PERF_RECORD_* events & perf_sample fields  : Ok
         7: Parse perf pmu format                      : Ok
         8: DSO data read                              : Ok
         9: DSO data cache                             : Ok
        10: DSO data reopen                            : Ok
        11: Roundtrip evsel->name                      : Ok
        12: Parse sched tracepoints fields             : Ok
        13: syscalls:sys_enter_openat event fields     : Ok
        14: Setup struct perf_event_attr               : Ok
        15: Match and link multiple hists              : Ok
        16: 'import perf' in python                    : Ok
        17: Breakpoint overflow signal handler         : Ok
        18: Breakpoint overflow sampling               : Ok
        19: Number of exit events of a simple workload : Ok
        20: Software clock events period values        : Ok
        21: Object code reading                        : Ok
        22: Sample parsing                             : Ok
        23: Use a dummy software event to keep tracking: Ok
        24: Parse with no sample_id_all bit set        : Ok
        25: Filter hist entries                        : Ok
        26: Lookup mmap thread                         : Ok
        27: Share thread mg                            : Ok
        28: Sort output of hist entries                : Ok
        29: Cumulate child hist entries                : Ok
        30: Track with sched_switch                    : Ok
        31: Filter fds with revents mask in a fdarray  : Ok
        32: Add fd to a fdarray, making it autogrow    : Ok
        33: kmod_path__parse                           : Ok
        34: Thread map                                 : Ok
        35: LLVM search and compile                    :
        35.1: Basic BPF llvm compile                    : Ok
        35.2: kbuild searching                          : Ok
        35.3: Compile source for BPF prologue generation: Ok
        35.4: Compile source for BPF relocation         : Ok
        36: Session topology                           : Ok
        37: BPF filter                                 :
        37.1: Basic BPF filtering                      : Ok
        37.2: BPF prologue generation                  : Ok
        37.3: BPF relocation checker                   : Ok
        38: Synthesize thread map                      : Ok
        39: Synthesize cpu map                         : Ok
        40: Synthesize stat config                     : Ok
        41: Synthesize stat                            : Ok
        42: Synthesize stat round                      : Ok
        43: Synthesize attr update                     : Ok
        44: Event times                                : Ok
        45: Read backward ring buffer                  : Ok
        46: Print cpu map                              : Ok
        47: Probe SDT events                           : Ok
        48: is_printable_array                         : Ok
        49: Print bitmap                               : Ok
        50: perf hooks                                 : Ok
        51: x86 rdpmc                                  : Ok
        52: Convert perf time to TSC                   : Ok
        53: DWARF unwind                               : Ok
        54: x86 instruction decoder - new instructions : Ok
        55: Intel cqm nmi context read                 : Skip
        #
      
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-rx2lbfcrrio2yx1fxcljqy0e@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      030910c0
    • Wang Nan's avatar
      perf tools: Introduce perf hooks · a074865e
      Wang Nan authored
      Perf hooks allow hooking user code at perf events. They can be used for
      manipulation of BPF maps, taking snapshot and reporting results. In this
      patch two perf hook points are introduced: record_start and record_end.
      
      To avoid buggy user actions, a SIGSEGV signal handler is introduced into
      'perf record'. It turns off perf hook if it causes a segfault and report
      an error to help debugging.
      
      A test case for perf hook is introduced.
      
      Test result:
        $ ./buildperf/perf test -v hook
        50: Test perf hooks                                          :
        --- start ---
        test child forked, pid 10311
        SIGSEGV is observed as expected, try to recover.
        Fatal error (SEGFAULT) in perf hook 'test'
        test child finished with 0
        ---- end ----
        Test perf hooks: Ok
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Cc: Alexei Starovoitov <ast@fb.com>
      Cc: He Kuang <hekuang@huawei.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Joe Stringer <joe@ovn.org>
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/20161126070354.141764-5-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      a074865e
    • Wang Nan's avatar
      tools lib bpf: Retrive bpf_map through offset of bpf_map_def · 5a6acad1
      Wang Nan authored
      Add a new API to libbpf, caller is able to get bpf_map through the
      offset of bpf_map_def to 'maps' section.
      
      The API will be used to help jitted perf hook code find fd of a map.
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Cc: He Kuang <hekuang@huawei.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Joe Stringer <joe@ovn.org>
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/20161126070354.141764-4-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      5a6acad1
    • Wang Nan's avatar
      tools lib bpf: Add private field for bpf_object · 10931d24
      Wang Nan authored
      Similar to other classes defined in libbpf.h (map and program), allow
      'object' class has its own private data.
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Cc: He Kuang <hekuang@huawei.com>
      Cc: Joe Stringer <joe@ovn.org>
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/20161126070354.141764-3-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      10931d24
    • Wang Nan's avatar
      tools lib bpf: Add missing BPF functions · 9742da01
      Wang Nan authored
      Add more BPF map operations to libbpf. Also add bpf_obj_{pin,get}(). They
      can be used on not only BPF maps but also BPF programs.
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Cc: He Kuang <hekuang@huawei.com>
      Cc: Joe Stringer <joe@ovn.org>
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/20161126070354.141764-2-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      9742da01
  3. 25 Nov, 2016 17 commits
    • David Ahern's avatar
    • David Ahern's avatar
      perf sched timehist: Handle cpu migration events · 350f54fa
      David Ahern authored
      Add handlers for sched:sched_migrate_task event. Total number of
      migrations is added to summary display and -M/--migrations can be used
      to show migration events.
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Link: http://lkml.kernel.org/r/1480091321-35591-1-git-send-email-dsa@cumulusnetworks.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      350f54fa
    • Arnaldo Carvalho de Melo's avatar
      perf annotate: Show invalid jump offset in error message · 5252b1ae
      Arnaldo Carvalho de Melo authored
      To help in debugging when the wrong offset is being used, like in:
      
             │13d98: ↓ jne    13dd1 <lzma_lzma_preset@@XZ_5.0+0x28e1>
      
      That is the full line from objdump, and it seems what should be used is
      13dd1, not 28e1.
      
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-4nc0marsgst1ft6inmvqber7@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      5252b1ae
    • Arnaldo Carvalho de Melo's avatar
      perf ui helpline: Provide a printf variant · 9484b86e
      Arnaldo Carvalho de Melo authored
      To print some values, like in the annotation code with invalid jump
      offsets.
      
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-1vk0g5twas2ioswn1mmvnvwq@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      9484b86e
    • Ingo Molnar's avatar
      Merge tag 'perf-core-for-mingo-20161125' of... · 2471cece
      Ingo Molnar authored
      Merge tag 'perf-core-for-mingo-20161125' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
      
      Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:
      
      New features:
      
      - Improve ARM support in the annotation code, affecting 'perf annotate', 'perf
        report' and live annotation in 'perf top' (Kim Phillips)
      
      - Initial support for PowerPC in the annotation code (Ravi Bangoria)
      
      - Skip repetitive scheduler function on the top of the stack in
        'perf sched timehist' (Namhyung Kim)
      
      Fixes:
      
      - Fix maps resolution in libbpf (Eric Leblond)
      
      - Get the kernel signature via /proc/version_signature, available on
        Ubuntu systems, to make sure BPF proggies works, as the one provided
        via 'uname -r' doesn't (Wang Nan)
      
      - Fix segfault in 'perf record' when running with suid and kptr_restrict
        is 1 (Wang Nan)
      
      Infrastructure changes:
      
      - Support per-arch instruction tables, kept via a static or dynamic table
        (Arnaldo Carvalho de Melo)
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      2471cece
    • Eric Leblond's avatar
      tools lib bpf: Fix maps resolution · 4708bbda
      Eric Leblond authored
      It is not correct to assimilate the elf data of the maps section to an
      array of map definition. In fact the sizes differ. The offset provided
      in the symbol section has to be used instead.
      
      This patch fixes a bug causing a elf with two maps not to load
      correctly.
      
      Wang Nan added:
      
      This patch requires a name for each BPF map, so array of BPF maps is not
      allowed. This restriction is reasonable, because kernel verifier forbid
      indexing BPF map from such array unless the index is a fixed value, but
      if the index is fixed why not merging it into name?
      
      For example:
      
      Program like this:
        ...
        unsigned long cpu = get_smp_processor_id();
        int *pval = map_lookup_elem(&map_array[cpu], &key);
        ...
      
      Generates bytecode like this:
      
      0: (b7) r1 = 0
      1: (63) *(u32 *)(r10 -4) = r1
      2: (b7) r1 = 680997
      3: (63) *(u32 *)(r10 -8) = r1
      4: (85) call 8
      5: (67) r0 <<= 4
      6: (18) r1 = 0x112dd000
      8: (0f) r0 += r1
      9: (bf) r2 = r10
      10: (07) r2 += -4
      11: (bf) r1 = r0
      12: (85) call 1
      
      Where instruction 8 is the computation, 8 and 11 render r1 to an invalid
      value for function map_lookup_elem, causes verifier report error.
      Signed-off-by: default avatarEric Leblond <eric@regit.org>
      Cc: Alexei Starovoitov <ast@fb.com>
      Cc: He Kuang <hekuang@huawei.com>
      Cc: Wang Nan <wangnan0@huawei.com>
      [ Merge bpf_object__init_maps_name into bpf_object__init_maps.
        Fix segfault for buggy BPF script Validate obj->maps ]
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/20161115040617.69788-5-wangnan0@huawei.comSigned-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      4708bbda
    • Wang Nan's avatar
      perf tools: Add missing struct definition in probe_event.h · d6be1671
      Wang Nan authored
      Commit 0b3c2264 ("perf symbols: Fix kallsyms perf test on ppc64le")
      refers struct symbol in probe_event.h, but forgets to include its
      definition.  Gcc will complain about it when that definition is not
      added, by sheer luck, by some other header included before
      probe_event.h.
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Cc: Alexei Starovoitov <ast@fb.com>
      Cc: He Kuang <hekuang@huawei.com>
      Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/20161115040617.69788-4-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      d6be1671
    • Wang Nan's avatar
      perf record: Fix segfault when running with suid and kptr_restrict is 1 · 3dbe46c5
      Wang Nan authored
      Before this patch perf panics if kptr_restrict is set to 1 and perf is
      owned by root with suid set:
      
        $ whoami
        wangnan
        $ ls -l ./perf
        -rwsr-xr-x 1 root root 19781908 Sep 21 19:29 /home/wangnan/perf
        $ cat /proc/sys/kernel/kptr_restrict
        1
        $ cat /proc/sys/kernel/perf_event_paranoid
        -1
        $ ./perf record -a
        Segmentation fault (core dumped)
        $
      
      The reason is that perf assumes it is allowed to read kptr from
      /proc/kallsyms when euid is root, but in fact the kernel doesn't allow
      reading kptr when euid and uid do not match with each other:
      
        $ cp /bin/cat .
        $ sudo chown root:root ./cat
        $ sudo chmod u+s ./cat
        $ cat /proc/kallsyms | grep do_fork
        0000000000000000 T _do_fork          <--- kptr is hidden even euid is root
        $ sudo cat /proc/kallsyms | grep do_fork
        ffffffff81080230 T _do_fork
      
      See lib/vsprintf.c for kernel side code.
      
      This patch fixes this problem by checking both uid and euid.
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Alexei Starovoitov <ast@fb.com>
      Cc: He Kuang <hekuang@huawei.com>
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/20161115040617.69788-3-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      3dbe46c5
    • Wang Nan's avatar
      perf tools: Fix kernel version error in ubuntu · d18acd15
      Wang Nan authored
      On ubuntu the internal kernel version code is different from what can
      be retrived from uname:
      
       $ uname -r
       4.4.0-47-generic
       $ cat /lib/modules/`uname -r`/build/include/generated/uapi/linux/version.h
       #define LINUX_VERSION_CODE 263192
       #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
       $ cat /lib/modules/`uname -r`/build/include/generated/utsrelease.h
       #define UTS_RELEASE "4.4.0-47-generic"
       #define UTS_UBUNTU_RELEASE_ABI 47
       $ cat /proc/version_signature
       Ubuntu 4.4.0-47.68-generic 4.4.24
      
      The macro LINUX_VERSION_CODE is set to 4.4.24 (263192 == 0x40418), but
      `uname -r` reports 4.4.0.
      
      This mismatch causes LINUX_VERSION_CODE macro passed to BPF script become
      an incorrect value, results in magic failure in BPF loading:
      
       $ sudo ./buildperf/perf record -e ./tools/perf/tests/bpf-script-example.c ls
       event syntax error: './tools/perf/tests/bpf-script-example.c'
                            \___ Failed to load program for unknown reason
      
      According to Ubuntu document (https://wiki.ubuntu.com/Kernel/FAQ), the
      correct kernel version can be retrived through /proc/version_signature, which
      is ubuntu specific.
      
      This patch checks the existance of /proc/version_signature, and returns
      version number through parsing this file instead of uname. Version string
      is untouched (value returns from uname) because `uname -r` is required
      to be consistence with path of kbuild directory in /lib/module.
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Cc: Alexei Starovoitov <ast@fb.com>
      Cc: He Kuang <hekuang@huawei.com>
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/20161115040617.69788-2-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      d18acd15
    • Namhyung Kim's avatar
      perf sched timehist: Enlarge max stack depth by 2 · 8388deb3
      Namhyung Kim authored
      When it records callchains, they will always have 2 scheduler functions
      (__schedule + schedule or __schedule + preempt_schedule) and get
      ignored.  So it should collect 2 more functions to show the expected
      number of callchains to user.
      
      Committer Notes:
      
      Example of final result, using the same perf.data file as in the
      previous cset comment, but this time redirecting the output of 'perf
      sched timehist' to a file instead of copy'n'pasting from xterm:
      
        [root@jouet experimental]# perf sched timehist > /tmp/bla
        [root@jouet experimental]# cat /tmp/bla
            time  cpu task name        wait time sch delay run time
                       [tid/pid]            (msec) (msec) (msec)
        -------- ----  -------------------- ------ ------ -----
        6.494998 [01] <idle>                0.000  0.000  0.000
        6.495027 [02] perf[519]             0.000  0.000  0.000 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll
        6.495096 [03] <idle>                0.000  0.000  0.000
        6.495100 [03] rcuos/0[9]            0.000  0.005  0.003 rcu_nocb_kthread <- kthread <- ret_from_fork
        6.495113 [01] perf[520]             0.000  0.008  0.114 preempt_schedule_common <- _cond_resched <- wait_for_completion <- stop_one_cpu <- sched_exec <- do_execveat_common.isra.35
        6.495121 [00] <idle>                0.000  0.000  0.000
        6.495129 [01] migration/1[17]       0.000  0.003  0.016 smpboot_thread_fn <- kthread <- ret_from_fork
        6.496085 [02] <idle>                0.000  0.000  1.057
        6.496096 [02] kworker/u16:1[31169]  0.000  0.004  0.011 worker_thread <- kthread <- ret_from_fork
        6.496096 [03] <idle>                0.003  0.000  0.996
        6.496169 [02] <idle>                0.011  0.000  0.072
        6.496171 [00] ls[520]               0.008  0.000  1.049 do_exit <- do_group_exit <- [unknown] <- entry_SYSCALL_64_fastpath
        6.496172 [03] gnome-terminal-[4391] 0.000  0.003  0.076 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20161124011114.7102-3-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      8388deb3
    • Namhyung Kim's avatar
      perf sched timehist: Mark schedule function in callchains · cdeb01bf
      Namhyung Kim authored
      The sched_switch event always captured from the scheduler function.  So
      it'd be great omit them from the callchain.  This patch marks the
      functions to be omitted by later patch.
      
      Committer notes:
      
      Testing it:
      
      Before:
      
        [root@jouet experimental]# perf sched record -g ls
        Dockerfile  perf.data  x-mips64
        [ perf record: Woken up 1 times to write data ]
        [ perf record: Captured and wrote 1.355 MB perf.data (29 samples) ]
        [root@jouet experimental]# perf sched timehist
            time  cpu  task name         wait time sch delay run time
                       [tid/pid]             (msec) (msec) (msec)
        ----------- -----  ----------------- ------ ------ ------
        6.494998 [001] <idle>                0.000  0.000  0.000
        6.495027 [002] perf[519]             0.000  0.000  0.000 __schedule <- schedule <- schedule_hrtimeout_range_clock <- schedule_hrtimeou
        6.495096 [003] <idle>                0.000  0.000  0.000
        6.495100 [003] rcuos/0[9]            0.000  0.005  0.003 __schedule <- schedule <- rcu_nocb_kthread <- kthread <- ret_from_fork
        6.495113 [001] perf[520]             0.000  0.008  0.114 __schedule <- preempt_schedule_common <- _cond_resched <- wait_for_completion
        6.495121 [000] <idle>                0.000  0.000  0.000
        6.495129 [001] migration/1[17]       0.000  0.003  0.016 __schedule <- schedule <- smpboot_thread_fn <- kthread <- ret_from_fork
        6.496085 [002] <idle>                0.000  0.000  1.057
        6.496096 [002] kworker/u16:1[31169]  0.000  0.004  0.011 __schedule <- schedule <- worker_thread <- kthread <- ret_from_fork
        6.496096 [003] <idle>                0.003  0.000  0.996
        6.496169 [002] <idle>                0.011  0.000  0.072
        6.496171 [000] ls[520]               0.008  0.000  1.049 __schedule <- schedule <- do_exit <- do_group_exit <- [unknown]
        6.496172 [003] gnome-terminal-[4391] 0.000  0.003  0.076 __schedule <- schedule <- schedule_hrtimeout_range_clock <- schedule_hrtimeo
      
      After:
      
        [root@jouet experimental]# perf sched timehist
            time  cpu  task name         wait time sch delay run time
                       [tid/pid]            (msec)  (msec)  (msec)
        ----------- -----  ----------------- -----  -----  ------
        6.494998 [001] <idle>                0.000  0.000  0.000
        6.495027 [002] perf[519]             0.000  0.000  0.000 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_t
        6.495096 [003] <idle>                0.000  0.000  0.000
        6.495100 [003] rcuos/0[9]            0.000  0.005  0.003 rcu_nocb_kthread <- kthread <- ret_from_fork
        6.495113 [001] perf[520]             0.000  0.008  0.114 preempt_schedule_common <- _cond_resched <- wait_for_completion <- stop_one_c
        6.495121 [000] <idle>                0.000  0.000  0.000
        6.495129 [001] migration/1[17]       0.000  0.003  0.016 smpboot_thread_fn <- kthread <- ret_from_fork
        6.496085 [002] <idle>                0.000  0.000  1.057
        6.496096 [002] kworker/u16:1[31169]  0.000  0.004  0.011 worker_thread <- kthread <- ret_from_fork
        6.496096 [003] <idle>                0.003  0.000  0.996
        6.496169 [002] <idle>                0.011  0.000  0.072
        6.496171 [000] ls[520]               0.008  0.000  1.049 do_exit <- do_group_exit <- [unknown]
        6.496172 [003] gnome-terminal-[4391] 0.000  0.003  0.076 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_
        [root@jouet experimental]#
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20161124011114.7102-1-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      cdeb01bf
    • Namhyung Kim's avatar
      perf callchain: Add option to skip ignore symbol when printing callchains · 2d9bbf6e
      Namhyung Kim authored
      For tracepoint events, callchains always contain certain functions.
      Sometimes it'd be better to skip those functions as they have no value.
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20161124011114.7102-2-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      2d9bbf6e
    • Ravi Bangoria's avatar
      perf annotate: Initial PowerPC support · dbdebdc5
      Ravi Bangoria authored
      Support the PowerPC architecture using the ins_ops association
      method.
      
      Committer notes:
      
      Testing it with a perf.data file collected on a PowerPC machine and
      cross-annotated on a x86_64 workstation, using the associated vmlinux
      file:
      
      $ perf report -i perf.data.f22vm.powerdev --vmlinux vmlinux.powerpc
        .ktime_get  vmlinux.powerpc
              │      clrldi r9,r28,63
         8.57 │   ┌──bne    e0                   <- TUI cursor positioned here
              │54:│  lwsync
         2.86 │   │  std    r2,40(r1)
              │   │  ld     r9,144(r31)
              │   │  ld     r3,136(r31)
              │   │  ld     r30,184(r31)
              │   │  ld     r10,0(r9)
              │   │  mtctr  r10
              │   │  ld     r2,8(r9)
         8.57 │   │→ bctrl
              │   │  ld     r2,40(r1)
              │   │  ld     r10,160(r31)
              │   │  ld     r5,152(r31)
              │   │  lwz    r7,168(r31)
              │   │  ld     r9,176(r31)
         8.57 │   │  lwz    r6,172(r31)
              │   │  lwsync
         2.86 │   │  lwz    r8,128(r31)
              │   │  cmpw   cr7,r8,r28
         2.86 │   │↑ bne    48
              │   │  subf   r10,r10,r3
              │   │  mr     r3,r29
              │   │  and    r10,r10,r5
         2.86 │   │  mulld  r10,r10,r7
              │   │  add    r9,r10,r9
              │   │  srd    r9,r9,r6
              │   │  add    r9,r9,r30
              │   │  std    r9,0(r29)
              │   │  addi   r1,r1,144
              │   │  ld     r0,16(r1)
              │   │  ld     r28,-32(r1)
              │   │  ld     r29,-24(r1)
              │   │  ld     r30,-16(r1)
              │   │  mtlr   r0
              │   │  ld     r31,-8(r1)
              │   │← blr
         5.71 │e0:└─→mr     r1,r1
        11.43 │      mr     r2,r2
        11.43 │      lwz    r28,128(r31)
        Press 'h' for help on key bindings
      
        $ perf report -i perf.data.f22vm.powerdev --header-only
        # ========
        # captured on: Thu Nov 24 12:40:38 2016
        # hostname : pdev-f22-qemu
        # os release : 4.4.10-200.fc22.ppc64
        # perf version : 4.9.rc1.g6298ce
        # arch : ppc64
        # nrcpus online : 48
        # nrcpus avail : 48
        # cpudesc : POWER7 (architected), altivec supported
        # cpuid : 74,513
        # total memory : 4158976 kB
        # cmdline : /home/ravi/Workspace/linux/tools/perf/perf record -a
        # event : name = cycles:ppp, , size = 112, { sample_period, sample_freq } = 4000, sample_type = IP|TID|TIME|CPU|PERIOD, disabled = 1, inherit = 1, mmap = 1, comm = 1, freq = 1, task = 1, precise_ip = 3, sample_id_all = 1, exclude_guest = 1, mmap2 = 1, comm_exec = 1
        # HEADER_CPU_TOPOLOGY info available, use -I to display
        # HEADER_NUMA_TOPOLOGY info available, use -I to display
        # pmu mappings: cpu = 4, software = 1, tracepoint = 2, breakpoint = 5
        # missing features: HEADER_TRACING_DATA HEADER_BRANCH_STACK HEADER_GROUP_DESC HEADER_AUXTRACE HEADER_STAT HEADER_CACHE
        # ========
        #
        $
      Signed-off-by: default avatarRavi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
      Signed-off-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Kim Phillips <kim.phillips@arm.com>
      Link: http://lkml.kernel.org/n/tip-tbjnp40ddoxxl474uvhwi6g4@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      dbdebdc5
    • Arnaldo Carvalho de Melo's avatar
      perf annotate: Improve support for ARM · acc9bfb5
      Arnaldo Carvalho de Melo authored
      By using arch->init() to set up some regular expressions to associate
      ins_ops to ARM instructions, ditching that old table that has
      instructions not present on ARM.
      
      Take advantage of having an arch->init() to hide more arm specific stuff
      from the common code, like the objdump details.
      
      The regular expressions comes from a patch written by Kim Phillips.
      Reviewed-by: default avatarRavi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Chris Riyder <chris.ryder@arm.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Kim Phillips <kim.phillips@arm.com>
      Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
      Cc: Masami Hiramatsu <mhiramat@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
      Cc: Pawel Moll <pawel.moll@arm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Russell King <rmk+kernel@arm.linux.org.uk>
      Cc: Taeung Song <treeze.taeung@gmail.com>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-77m7lufz9ajjimkrebtg5ead@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      acc9bfb5
    • Arnaldo Carvalho de Melo's avatar
      perf annotate: Allow arches to have a init routine and a priv area · 0781ea92
      Arnaldo Carvalho de Melo authored
      Arches like ARM will want to use regular expressions when deciding what
      instructions to associate with what ins_ops, provide infrastructure for
      that.
      Reviewed-by: default avatarRavi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Chris Riyder <chris.ryder@arm.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Kim Phillips <kim.phillips@arm.com>
      Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
      Cc: Masami Hiramatsu <mhiramat@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
      Cc: Pawel Moll <pawel.moll@arm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Russell King <rmk+kernel@arm.linux.org.uk>
      Cc: Taeung Song <treeze.taeung@gmail.com>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-7dmnk9el2ipu3nxog092k9z5@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      0781ea92
    • Arnaldo Carvalho de Melo's avatar
      perf annotate: Introduce alternative method of keeping instructions table · 2a1ff812
      Arnaldo Carvalho de Melo authored
      Some arches may want to dynamically populate the table using regular
      expressions on the instruction names to associate them with a set of
      parsing/formatting/etc functions (struct ins_ops), so provide a fallback
      for when the ins__find() method fails.
      
      That fall back will be able to resize the arch->instructions, setting
      arch->nr_instructions appropriately, helper functions to associate an
      ins_ops to an instruction name, growing the arch->instructions if needed
      and resorting it are provided, all the arch specific callback needs to
      do is to decide if the missing instruction should be added to
      arch->instructions with a ins_ops association.
      Reviewed-by: default avatarRavi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Chris Riyder <chris.ryder@arm.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Kim Phillips <kim.phillips@arm.com>
      Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
      Cc: Masami Hiramatsu <mhiramat@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
      Cc: Pawel Moll <pawel.moll@arm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Russell King <rmk+kernel@arm.linux.org.uk>
      Cc: Taeung Song <treeze.taeung@gmail.com>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-auu13yradxf7g5dgtpnzt97a@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      2a1ff812
    • Arnaldo Carvalho de Melo's avatar
      perf annotate: Remove duplicate 'name' field from disasm_line · 75b49202
      Arnaldo Carvalho de Melo authored
      The disasm_line::name field is always equal to ins::name, being used
      just to locate the instruction's ins_ops from the per-arch instructions
      table.
      
      Eliminate this duplication, nuking that field and instead make
      ins__find() return an ins_ops, store it in disasm_line::ins.ops, and
      keep just in disasm_line::ins.name what was in disasm_line::name, this
      way we end up not keeping a reference to entries in the per-arch
      instructions table.
      
      This in turn will help supporting multiple ways to manage the per-arch
      instructions table, allowing resorting that array, for instance, when
      the entries will move after references to its addresses were made. The
      same problem is avoided when one grows the array with realloc.
      
      So architectures simply keeping a constant array will work as well as
      architectures building the table using regular expressions or other
      logic that involves resorting the table.
      Reviewed-by: default avatarRavi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Chris Riyder <chris.ryder@arm.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Kim Phillips <kim.phillips@arm.com>
      Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
      Cc: Masami Hiramatsu <mhiramat@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
      Cc: Pawel Moll <pawel.moll@arm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Russell King <rmk+kernel@arm.linux.org.uk>
      Cc: Taeung Song <treeze.taeung@gmail.com>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-vr899azvabnw9gtuepuqfd9t@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      75b49202
  4. 24 Nov, 2016 2 commits
    • Ingo Molnar's avatar
      Merge tag 'perf-core-for-mingo-20161123' of... · 47414424
      Ingo Molnar authored
      Merge tag 'perf-core-for-mingo-20161123' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
      
      Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:
      
      New tool:
      
      - 'perf sched timehist' provides an analysis of scheduling events.
      
        Example usage:
            perf sched record -- sleep 1
            perf sched timehist
      
        By default it shows the individual schedule events, including the wait
        time (time between sched-out and next sched-in events for the task), the
        task scheduling delay (time between wakeup and actually running) and run
        time for the task:
      
              time    cpu  task name         wait time  sch delay  run time
                           [tid/pid]            (msec)     (msec)    (msec)
          -------- ------  ----------------  ---------  ---------  --------
          1.874569 [0011]  gcc[31949]            0.014      0.000     1.148
          1.874591 [0010]  gcc[31951]            0.000      0.000     0.024
          1.874603 [0010]  migration/10[59]      3.350      0.004     0.011
          1.874604 [0011]  <idle>                1.148      0.000     0.035
          1.874723 [0005]  <idle>                0.016      0.000     1.383
          1.874746 [0005]  gcc[31949]            0.153      0.078     0.022
        ...
      
        Times are in msec.usec. (David Ahern, Namhyung Kim)
      
      Improvements:
      
      - Make 'perf c2c report' support -f/--force, to allow skipping the
        ownership check for root users, for instance, just like the other
        tools (Jiri Olsa)
      
      - Allow sorting cachelines by total number of HITMs, in addition to
        local and remote numbers (Jiri Olsa)
      
      Fixes:
      
      - Make sure errors aren't suppressed by the TUI reset at the end of
        a 'perf c2c report' session (Jiri Olsa)
      
      Infrastructure changes:
      
      - Initial work on having the annotate code better support multiple
        architectures, including the ability to cross-annotate, i.e. to
        annotate perf.data files collected on an ARM system on a x86_64
        workstation (Arnaldo Carvalho de Melo, Ravi Bangoria, Kim Phillips)
      
      - Use USECS_PER_SEC instead of hard coded number in libtraceevent (Steven Rostedt)
      
      - Add retrieval of preempt count and latency flags in libtraceevent (Steven Rostedt)
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      47414424
    • Ingo Molnar's avatar
      69e6cdd0
  5. 23 Nov, 2016 10 commits
    • Linus Torvalds's avatar
      Merge tag 'nfs-for-4.9-4' of git://git.linux-nfs.org/projects/anna/linux-nfs · 10b9dd56
      Linus Torvalds authored
      Pull NFS client bugfixes from Anna Schumaker:
       "Most of these fix regressions or races, but there is one patch for
        stable that Arnd sent me
      
        Stable bugfix:
         - Hide array-bounds warning
      
        Bugfixes:
         - Keep a reference on lock states while checking
         - Handle NFS4ERR_OLD_STATEID in nfs4_reclaim_open_state
         - Don't call close if the open stateid has already been cleared
         - Fix CLOSE rases with OPEN
         - Fix a regression in DELEGRETURN"
      
      * tag 'nfs-for-4.9-4' of git://git.linux-nfs.org/projects/anna/linux-nfs:
        NFSv4.x: hide array-bounds warning
        NFSv4.1: Keep a reference on lock states while checking
        NFSv4.1: Handle NFS4ERR_OLD_STATEID in nfs4_reclaim_open_state
        NFSv4: Don't call close if the open stateid has already been cleared
        NFSv4: Fix CLOSE races with OPEN
        NFSv4.1: Fix a regression in DELEGRETURN
      10b9dd56
    • Linus Torvalds's avatar
      Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile · 4d92c8d0
      Linus Torvalds authored
      Pull arch/tile bugfix from Chris Metcalf:
       "This fixes a bug that causes reboots after 208 days of uptime :-)"
      
      * 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
        tile: avoid using clocksource_cyc2ns with absolute cycle count
      4d92c8d0
    • Chris Metcalf's avatar
      tile: avoid using clocksource_cyc2ns with absolute cycle count · e658a6f1
      Chris Metcalf authored
      For large values of "mult" and long uptimes, the intermediate
      result of "cycles * mult" can overflow 64 bits.  For example,
      the tile platform calls clocksource_cyc2ns with a 1.2 GHz clock;
      we have mult = 853, and after 208.5 days, we overflow 64 bits.
      
      Since clocksource_cyc2ns() is intended to be used for relative
      cycle counts, not absolute cycle counts, performance is more
      importance than accepting a wider range of cycle values.  So,
      just use mult_frac() directly in tile's sched_clock().
      
      Commit 4cecf6d4 ("sched, x86: Avoid unnecessary overflow
      in sched_clock") by Salman Qazi results in essentially the same
      generated code for x86 as this change does for tile.  In fact,
      a follow-on change by Salman introduced mult_frac() and switched
      to using it, so the C code was largely identical at that point too.
      
      Peter Zijlstra then added mul_u64_u32_shr() and switched x86
      to use it.  This is, in principle, better; by optimizing the
      64x64->64 multiplies to be 32x32->64 multiplies we can potentially
      save some time.  However, the compiler piplines the 64x64->64
      multiplies pretty well, and the conditional branch in the generic
      mul_u64_u32_shr() causes some bubbles in execution, with the
      result that it's pretty much a wash.  If tilegx provided its own
      implementation of mul_u64_u32_shr() without the conditional branch,
      we could potentially save 3 cycles, but that seems like small gain
      for a fair amount of additional build scaffolding; no other platform
      currently provides a mul_u64_u32_shr() override, and tile doesn't
      currently have an <asm/div64.h> header to put the override in.
      
      Additionally, gcc currently has an optimization bug that prevents
      it from recognizing the opportunity to use a 32x32->64 multiply,
      and so the result would be no better than the existing mult_frac()
      until such time as the compiler is fixed.
      
      For now, just using mult_frac() seems like the right answer.
      
      Cc: stable@kernel.org [v3.4+]
      Signed-off-by: default avatarChris Metcalf <cmetcalf@mellanox.com>
      e658a6f1
    • Linus Torvalds's avatar
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · ded9b5dd
      Linus Torvalds authored
      Pull perf fixes from Ingo Molnar:
       "Six fixes for bugs that were found via fuzzing, and a trivial
        hw-enablement patch for AMD Family-17h CPU PMUs"
      
      * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        perf/x86/intel/uncore: Allow only a single PMU/box within an events group
        perf/x86/intel: Cure bogus unwind from PEBS entries
        perf/x86: Restore TASK_SIZE check on frame pointer
        perf/core: Fix address filter parser
        perf/x86: Add perf support for AMD family-17h processors
        perf/x86/uncore: Fix crash by removing bogus event_list[] handling for SNB client uncore IMC
        perf/core: Do not set cpuctx->cgrp for unscheduled cgroups
      ded9b5dd
    • David Ahern's avatar
      perf sched timehist: Add -V/--cpu-visual option · a407b067
      David Ahern authored
      The -V option provides a visual aid for sched switches by cpu:
      
        $ perf sched timehist -V
                   time    cpu  0123456789abc  task name              b/n time  sch delay   run time
                                               [tid/pid]                (msec)     (msec)     (msec)
        --------------- ------  -------------  --------------------  ---------  ---------  ---------
        ...
         2412598.429696 [0009]           i     <idle>                    0.000      0.000      0.000
         2412598.429767 [0002]    s            perf[7219]                0.000      0.000      0.000
         2412598.429783 [0009]           s     perf[7220]                0.000      0.006      0.087
         2412598.429794 [0010]            i    <idle>                    0.000      0.000      0.000
         2412598.429795 [0009]           s     migration/9[53]           0.000      0.003      0.011
         2412598.430370 [0010]            s    sleep[7220]               0.011      0.000      0.576
         2412598.432584 [0003]     i           <idle>                    0.000      0.000      0.000
        ...
      
      Committer notes:
      
      'i' marks idle time, 's' are scheduler events.
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20161116060634.28477-8-namhyung@kernel.org
      [ Add documentation based on above commit message ]
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      a407b067
    • David Ahern's avatar
      perf sched timehist: Add call graph options · 6c973c90
      David Ahern authored
      If callchains were recorded they are appended to the line with a default stack depth of 5:
      
        1.874569 [0011] gcc[31949]       0.014 0.000 1.148 wait_for_completion_killable <- do_fork <- sys_vfork <- stub_vfork <- __vfork
        1.874591 [0010] gcc[31951]       0.000 0.000 0.024 __cond_resched <- _cond_resched <- wait_for_completion <- stop_one_cpu <- sched_exec
        1.874603 [0010] migration/10[59] 3.350 0.004 0.011 smpboot_thread_fn <- kthread <- ret_from_fork
        1.874604 [0011] <idle>           1.148 0.000 0.035 cpu_startup_entry <- start_secondary
        1.874723 [0005] <idle>           0.016 0.000 1.383 cpu_startup_entry <- start_secondary
        1.874746 [0005] gcc[31949]       0.153 0.078 0.022 do_wait sys_wait4 <- system_call_fastpath <- __GI___waitpid
      
       --no-call-graph can be used to not show the callchains. --max-stack is used
      to control the number of frames shown (default of 5). -x/--excl options can
      be used to collapse redundant callchains to get more relevant data on screen.
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20161116060634.28477-7-namhyung@kernel.org
      [ Add documentation based on above commit message ]
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      6c973c90
    • David Ahern's avatar
      perf sched timehist: Add -w/--wakeups option · fc1469f1
      David Ahern authored
      The -w option is to show wakeup events with timehist.
      
        $ perf sched timehist -w
                   time    cpu  task name              b/n time  sch delay   run time
                                [tid/pid]                (msec)     (msec)     (msec)
        --------------- ------  --------------------  ---------  ---------  ---------
         2412598.429689 [0002]  perf[7219]                                             awakened: perf[7220]
         2412598.429696 [0009]  <idle>                    0.000      0.000      0.000
         2412598.429767 [0002]  perf[7219]                0.000      0.000      0.000
         2412598.429780 [0009]  perf[7220]                                             awakened: migration/9[53]
        ...
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20161116060634.28477-6-namhyung@kernel.org
      [ Add documentation based on above commit message ]
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      fc1469f1
    • David Ahern's avatar
      perf sched timehist: Add summary options · 52df138c
      David Ahern authored
      The -s/--summary option is to show process runtime statistics.  And the
       -S/--with-summary option is to show the stats with the normal output.
      
        $ perf sched timehist -s
      
        Runtime summary
                                  comm  parent   sched-in     run-time    min-run     avg-run     max-run  stddev
                                                  (count)       (msec)     (msec)      (msec)      (msec)       %
        ---------------------------------------------------------------------------------------------------------
                        ksoftirqd/0[3]       2          2        0.011      0.004       0.005       0.006   14.87
                        rcu_preempt[7]       2         11        0.071      0.002       0.006       0.017   20.23
                        watchdog/0[11]       2          1        0.002      0.002       0.002       0.002    0.00
                        watchdog/1[12]       2          1        0.004      0.004       0.004       0.004    0.00
        ...
      
        Terminated tasks:
                           sleep[7220]    7219          3        0.770      0.087       0.256       0.576   62.28
      
        Idle stats:
            CPU  0 idle for   2352.006  msec
            CPU  1 idle for   2764.497  msec
            CPU  2 idle for   2998.229  msec
            CPU  3 idle for   2967.800  msec
      
            Total number of unique tasks: 52
        Total number of context switches: 2532
                   Total run time (msec): 218.036
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20161116060634.28477-5-namhyung@kernel.org
      [ Add documentation from last commit, so that docs comes with the cset that introduces the feature ]
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      52df138c
    • David Ahern's avatar
      perf sched timehist: Introduce timehist command · 49394a2a
      David Ahern authored
      'perf sched timehist' provides an analysis of scheduling events.
      
      Example usage:
          perf sched record -- sleep 1
          perf sched timehist
      
      By default it shows the individual schedule events, including the wait
      time (time between sched-out and next sched-in events for the task), the
      task scheduling delay (time between wakeup and actually running) and run
      time for the task:
      
                  time    cpu  task name             wait time  sch delay   run time
                               [tid/pid]                (msec)     (msec)     (msec)
        -------------- ------  --------------------  ---------  ---------  ---------
          79371.874569 [0011]  gcc[31949]                0.014      0.000      1.148
          79371.874591 [0010]  gcc[31951]                0.000      0.000      0.024
          79371.874603 [0010]  migration/10[59]          3.350      0.004      0.011
          79371.874604 [0011]  <idle>                    1.148      0.000      0.035
          79371.874723 [0005]  <idle>                    0.016      0.000      1.383
          79371.874746 [0005]  gcc[31949]                0.153      0.078      0.022
      ...
      
      Times are in msec.usec.
      
      Committer note:
      
      Add above explanation as the 'perf sched timehist' entry for 'man
      perf-sched'.
      Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20161116060634.28477-4-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      49394a2a
    • Namhyung Kim's avatar
      perf evsel: Support printing callchains with arrows · 69b7e480
      Namhyung Kim authored
      The EVSEL__PRINT_CALLCHAIN_ARROW options can be used to print callchains
      with arrows for readability.  It will be used 'sched timehist' command
      like below:
      
          __schedule <- schedule <- schedule_timeout <- rcu_gp_kthread <- kthread <- ret_from_fork
          __schedule <- schedule <- schedule_timeout <- rcu_gp_kthread <- kthread <- ret_from_fork
          __schedule <- schedule <- worker_thread <- kthread <- ret_from_fork
      Suggested-and-Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20161116060634.28477-3-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      69b7e480