1. 05 Dec, 2016 11 commits
  2. 02 Dec, 2016 2 commits
    • Ingo Molnar's avatar
      Merge tag 'perf-core-for-mingo-20161201' of... · e7af7b15
      Ingo Molnar authored
      Merge tag 'perf-core-for-mingo-20161201' 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:
      
       - Support AArch64 in the 'annotate' code, native/local and
         cross-arch/remote (Kim Phillips)
      
       - Allow considering just events in a given time interval, via the
         '--time start.s.ms,end.s.ms' command line, added to 'perf kmem',
         'perf report', 'perf sched timehist' and 'perf script' (David Ahern)
      
       - Add option to stop printing a callchain at one of a given group of
         symbol names (David Ahern)
      
       - Handle CPU migration events in 'perf sched timehist' (David Ahern)
      
       - Track memory freed in 'perf kmem stat' (David Ahern)
      
      Infrastructure:
      
       - Add initial support (and perf test entry) for tooling hooks, starting with
         'record_start' and 'record_end', that will have as its initial user the
         eBPF infrastructure, where perf_ prefixed functions will be JITed and
         run when such hooks are called (Wang Nan)
      
       - Remove redundant "test" and similar strings from 'perf test' descriptions
         (Arnaldo Carvalho de Melo)
      
       - Implement assorted libbpf improvements (Wang Nan)
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      e7af7b15
    • Ingo Molnar's avatar
      3782746a
  3. 01 Dec, 2016 19 commits
    • Linus Torvalds's avatar
      Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs · 2caceb32
      Linus Torvalds authored
      Pull overlayfs fix from Miklos Szeredi:
       "This fixes a regression introduced in 4.8"
      
      * 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
        ovl: fix d_real() for stacked fs
      2caceb32
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input · 92cf44e2
      Linus Torvalds authored
      Pull input fixes from Dmitry Torokhov: "We are disabling automatic
        probing of BYD touchpads as it results in too many false positives,
        and the hardware is not terribly popular and having the protocol
        support does not result in significantly improved user experience.
      
        We also change keycode for KEY_DATA to avoid clashing with
        KEY_FASTREVERSE. Luckily this newish code is used by CEC framework
        that is still in staging, so it is extremely unlikely that someone has
        already started using this keycode"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
        Input: change KEY_DATA from 0x275 to 0x277
        Input: psmouse - disable automatic probing of BYD touchpads
      92cf44e2
    • Nicolas Pitre's avatar
      kbuild: make sure autoksyms.h exists early · d3fc425e
      Nicolas Pitre authored
      Some people are able to trigger a race where autoksyms.h is used before
      its empty version is even created.  Let's create it at the same time as
      the directory holding it is created.
      Signed-off-by: default avatarNicolas Pitre <nico@linaro.org>
      Tested-by: default avatarPrarit Bhargava <prarit@redhat.com>
      Tested-by: default avatarJarod Wilson <jarod@redhat.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d3fc425e
    • Kim Phillips's avatar
      perf annotate: AArch64 support · 0fcb1da4
      Kim Phillips authored
      This is a regex converted version from the original:
      
      	https://lkml.org/lkml/2016/5/19/461
      
      Add basic support to recognise AArch64 assembly. This allows perf to
      identify AArch64 instructions that branch to other parts within the
      same function, thereby properly annotating them.
      
      Rebased onto new cross-arch annotation bits:
      
      	https://lkml.org/lkml/2016/11/25/546
      
      Sample output:
      
      security_file_permission  vmlinux
        5.80 │    ← ret                                                  ▒
             │70:   ldr    w0, [x21,#68]                                 ▒
        4.44 │    ↓ tbnz   d0                                            ▒
             │      mov    w0, #0x24                       // #36        ▒
        1.37 │      ands   w0, w22, w0                                   ▒
             │    ↑ b.eq   60                                            ▒
        1.37 │    ↓ tbnz   e4                                            ▒
             │      mov    w19, #0x20000                   // #131072    ▒
        1.02 │    ↓ tbz    ec                                            ▒
             │90:┌─→ldr    x3, [x21,#24]                                 ▒
        1.37 │   │  add    x21, x21, #0x10                               ▒
             │   │  mov    w2, w19                                       ▒
        1.02 │   │  mov    x0, x21                                       ▒
             │   │  mov    x1, x3                                        ▒
        1.71 │   │  ldr    x20, [x3,#48]                                 ▒
             │   │→ bl     __fsnotify_parent                             ▒
        0.68 │   │↑ cbnz   60                                            ▒
             │   │  mov    x2, x21                                       ▒
        1.37 │   │  mov    w1, w19                                       ▒
             │   │  mov    x0, x20                                       ▒
        0.68 │   │  mov    w5, #0x0                        // #0         ▒
             │   │  mov    x4, #0x0                        // #0         ▒
        1.71 │   │  mov    w3, #0x1                        // #1         ▒
             │   │→ bl     fsnotify                                      ▒
        1.37 │   │↑ b      60                                            ▒
             │d0:│  mov    w0, #0x0                        // #0         ▒
             │   │  ldp    x19, x20, [sp,#16]                            ▒
             │   │  ldp    x21, x22, [sp,#32]                            ▒
             │   │  ldp    x29, x30, [sp],#48                            ▒
             │   │← ret                                                  ▒
             │e4:│  mov    w19, #0x10000                   // #65536     ▒
             │   └──b      90                                            ◆
             │ec:   brk    #0x800                                        ▒
      Press 'h' for help on key bindings
      Signed-off-by: default avatarKim Phillips <kim.phillips@arm.com>
      Signed-off-by: default avatarChris Ryder <chris.ryder@arm.com>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Cc: Pawel Moll <pawel.moll@arm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Will Deacon <will.deacon@arm.com>
      Link: http://lkml.kernel.org/r/20161130092344.012e18e3e623bea395162f95@arm.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      0fcb1da4
    • Kim Phillips's avatar
      perf annotate: Use arch->objdump.comment_char in dec__parse() · 859afa6c
      Kim Phillips authored
      Presume neglected in commit 786c1b51 "perf annotate: Start supporting
      cross arch annotation".  This doesn't fix a bug since none of the
      affected arches support parsing dec/inc instructions yet.
      Signed-off-by: default avatarKim Phillips <kim.phillips@arm.com>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Chris Ryder <chris.ryder@arm.com>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Cc: Pawel Moll <pawel.moll@arm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Will Deacon <will.deacon@arm.com>
      Link: http://lkml.kernel.org/r/20161130092333.1cca5dd2c77e1790d61c1e9c@arm.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      859afa6c
    • David Ahern's avatar
      perf report: Add option to specify time window of interest · 46690a80
      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:
      
      Using the perf.data file captured via 'perf kmem record':
      
        # perf report --header-only
        # ========
        # captured on: Tue Nov 29 16:01:53 2016
        # hostname : jouet
        # os release : 4.8.8-300.fc25.x86_64
        # perf version : 4.9.rc6.g5a6aca
        # arch : x86_64
        # nrcpus online : 4
        # nrcpus avail : 4
        # cpudesc : Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz
        # cpuid : GenuineIntel,6,61,4
        # total memory : 20254660 kB
        # cmdline : /home/acme/bin/perf kmem record usleep 1
        # event : name = kmem:kmalloc, , id = { 931980, 931981, 931982, 931983 }, type = 2, size = 112, config = 0x1b9, { sample_period, sample_freq } = 1, sample_typ
        # event : name = kmem:kmalloc_node, , id = { 931984, 931985, 931986, 931987 }, type = 2, size = 112, config = 0x1b7, { sample_period, sample_freq } = 1, sampl
        # event : name = kmem:kfree, , id = { 931988, 931989, 931990, 931991 }, type = 2, size = 112, config = 0x1b5, { sample_period, sample_freq } = 1, sample_type
        # event : name = kmem:kmem_cache_alloc, , id = { 931992, 931993, 931994, 931995 }, type = 2, size = 112, config = 0x1b8, { sample_period, sample_freq } = 1, s
        # event : name = kmem:kmem_cache_alloc_node, , id = { 931996, 931997, 931998, 931999 }, type = 2, size = 112, config = 0x1b6, { sample_period, sample_freq } =
        # event : name = kmem:kmem_cache_free, , id = { 932000, 932001, 932002, 932003 }, type = 2, size = 112, config = 0x1b4, { sample_period, sample_freq } = 1, sa
        # HEADER_CPU_TOPOLOGY info available, use -I to display
        # HEADER_NUMA_TOPOLOGY info available, use -I to display
        # pmu mappings: cpu = 4, intel_pt = 7, intel_bts = 6, uncore_arb = 13, cstate_pkg = 15, breakpoint = 5, uncore_cbox_1 = 12, power = 9, software = 1, uncore_im
        # HEADER_CACHE info available, use -I to display
        # missing features: HEADER_BRANCH_STACK HEADER_GROUP_DESC HEADER_AUXTRACE HEADER_STAT
        # ========
        #
        # # Looking at just the histogram entries for the first event:
        #
        # perf report  | head -33
        # To display the perf.data header info, please use --header/--header-only options.
        #
        #
        # Total Lost Samples: 0
        #
        # Samples: 40  of event 'kmem:kmalloc'
        # Event count (approx.): 40
        #
        # Overhead  Trace output
        # ........  ...............................................................................................................
        #
          37.50%  call_site=ffffffffb91ad3c7 ptr=0xffff88895fc05000 bytes_req=4096 bytes_alloc=4096 gfp_flags=GFP_KERNEL
          10.00%  call_site=ffffffffb9258416 ptr=0xffff888a1dc61f00 bytes_req=240 bytes_alloc=256 gfp_flags=GFP_KERNEL|__GFP_ZERO
           7.50%  call_site=ffffffffb9258416 ptr=0xffff888a2640ac00 bytes_req=240 bytes_alloc=256 gfp_flags=GFP_KERNEL|__GFP_ZERO
           2.50%  call_site=ffffffffb92759ba ptr=0xffff888a26776000 bytes_req=4096 bytes_alloc=4096 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb9276864 ptr=0xffff8886f6b82600 bytes_req=136 bytes_alloc=192 gfp_flags=GFP_KERNEL|__GFP_ZERO
           2.50%  call_site=ffffffffb9276903 ptr=0xffff888aefcf0460 bytes_req=32 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb92ad0ce ptr=0xffff888756c98a00 bytes_req=392 bytes_alloc=512 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb92ad0ce ptr=0xffff888756c9ba00 bytes_req=504 bytes_alloc=512 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb92ad301 ptr=0xffff888a31747600 bytes_req=128 bytes_alloc=128 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb92ad511 ptr=0xffff888a9d26a2a0 bytes_req=28 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb936a7fb ptr=0xffff88873e8c11a0 bytes_req=24 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb936a7fb ptr=0xffff88873e8c12c0 bytes_req=24 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb936a7fb ptr=0xffff88873e8c1540 bytes_req=24 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb936a7fb ptr=0xffff88873e8c15a0 bytes_req=24 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb936a7fb ptr=0xffff88873e8c15e0 bytes_req=24 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb936a7fb ptr=0xffff88873e8c16e0 bytes_req=24 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb936a7fb ptr=0xffff88873e8c1c20 bytes_req=24 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb936a7fb ptr=0xffff888a9d26a2a0 bytes_req=24 bytes_alloc=32 gfp_flags=GFP_KERNEL
           2.50%  call_site=ffffffffb9373e66 ptr=0xffff8889f1931240 bytes_req=64 bytes_alloc=64 gfp_flags=GFP_ATOMIC|__GFP_ZERO
           2.50%  call_site=ffffffffb9373e66 ptr=0xffff8889f1931980 bytes_req=64 bytes_alloc=64 gfp_flags=GFP_ATOMIC|__GFP_ZERO
           2.50%  call_site=ffffffffb9373e66 ptr=0xffff8889f1931a00 bytes_req=64 bytes_alloc=64 gfp_flags=GFP_ATOMIC|__GFP_ZERO
      
        #
        # # And then limiting using the example for 'perf kmem stat --time' used
        # # in the previous changeset committer note we see that there were no
        # # kmem:kmalloc in that last part of the file, but there were some
        # # kmem:kmem_cache_alloc ones:
        #
        # perf report --time 20119.782088, --stdio
        #
        # Total Lost Samples: 0
        #
        # Samples: 0  of event 'kmem:kmalloc'
        # Event count (approx.): 0
        #
        # Overhead  Trace output
        # ........  ............
        #
      
        # Samples: 0  of event 'kmem:kmalloc_node'
        # Event count (approx.): 0
        #
        # Overhead  Trace output
        # ........  ............
        #
      
        # Samples: 0  of event 'kmem:kfree'
        # Event count (approx.): 0
        #
        # Overhead  Trace output
        # ........  ............
        #
      
        # Samples: 8  of event 'kmem:kmem_cache_alloc'
        # Event count (approx.): 8
        #
        # Overhead  Trace output
        # ........  ..................................................................................................................
        #
          75.00%  call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
          12.50%  call_site=ffffffffb90ad33a ptr=0xffff8889f071f6e0 bytes_req=160 bytes_alloc=160 gfp_flags=GFP_ATOMIC|__GFP_NOTRACK
          12.50%  call_site=ffffffffb9287cc1 ptr=0xffff8889b12722d8 bytes_req=104 bytes_alloc=104 gfp_flags=GFP_NOFS|__GFP_ZERO
        #
      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/1480439746-42695-7-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      46690a80
    • David Ahern's avatar
      perf kmem: Add option to specify time window of interest · 2a865bd8
      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 kmem record usleep 1
        [ perf record: Woken up 0 times to write data ]
        [ perf record: Captured and wrote 1.540 MB perf.data (2049 samples) ]
        # perf evlist
        kmem:kmalloc
        kmem:kmalloc_node
        kmem:kfree
        kmem:kmem_cache_alloc
        kmem:kmem_cache_alloc_node
        kmem:kmem_cache_free
        # Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
        #
        # # Use 'perf script' to get a first approach, select a chunk for then using
        # # with 'perf kmem stat --time'
        #
        # perf script | tail -15
          usleep 9889 [0] 20119.782088:  kmem:kmem_cache_free: (selinux_file_free_security+0x27) call_site=ffffffffb936aa07 ptr=0xffff888a1df49fc0
            perf 9888 [3] 20119.782088:  kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
            perf 9888 [3] 20119.782089: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
            perf 9888 [3] 20119.782090:  kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
            perf 9888 [3] 20119.782090: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
          usleep 9889 [0] 20119.782091: kmem:kmem_cache_alloc: (__sigqueue_alloc+0x4a) call_site=ffffffffb90ad33a ptr=0xffff8889f071f6e0 bytes_req=160 bytes_alloc=160 gfp_flags=GFP_ATOMIC|__GFP_NOTRACK
            perf 9888 [3] 20119.782091:  kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
            perf 9888 [3] 20119.782093:  kmem:kmem_cache_free: (__sigqueue_free.part.17+0x33) call_site=ffffffffb90ad3f3 ptr=0xffff8889f071f6e0
            perf 9888 [3] 20119.782098: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
            perf 9888 [3] 20119.782098:  kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
            perf 9888 [3] 20119.782099: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
            perf 9888 [3] 20119.782100: kmem:kmem_cache_alloc: (alloc_buffer_head+0x21) call_site=ffffffffb9287cc1 ptr=0xffff8889b12722d8 bytes_req=104 bytes_alloc=104 gfp_flags=GFP_NOFS|__GFP_ZERO
            perf 9888 [3] 20119.782101:  kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
            perf 9888 [3] 20119.782102: kmem:kmem_cache_alloc: (jbd2__journal_start+0x72) call_site=ffffffffb9333b42 ptr=0xffff888bdf1a39c0 bytes_req=48 bytes_alloc=48 gfp_flags=GFP_NOFS|__GFP_ZERO
            perf 9888 [3] 20119.782103:  kmem:kmem_cache_free: (jbd2_journal_stop+0x1a1) call_site=ffffffffb9334581 ptr=0xffff888bdf1a39c0
        #
        # # stats for the whole perf.data file, i.e. no interval specified
        #
        # perf kmem stat
      
        SUMMARY (SLAB allocator)
        ========================
        Total bytes requested: 172,628
        Total bytes allocated: 173,088
        Total bytes freed:     161,280
        Net total bytes allocated: 11,808
        Total bytes wasted on internal fragmentation: 460
        Internal fragmentation: 0.265761%
        Cross CPU allocations: 0/851
        #
        # # stats for an end open interval, after a certain time:
        #
        # perf kmem stat --time 20119.782088,
      
        SUMMARY (SLAB allocator)
        ========================
        Total bytes requested: 552
        Total bytes allocated: 552
        Total bytes freed:     448
        Net total bytes allocated: 104
        Total bytes wasted on internal fragmentation: 0
        Internal fragmentation: 0.000000%
        Cross CPU allocations: 0/8
        #
      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/1480439746-42695-6-git-send-email-dsahern@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      2a865bd8
    • 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
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · 43c4f67c
      Linus Torvalds authored
      Merge misc fixes from Andrew Morton:
       "7 fixes"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>:
        mm: fix false-positive WARN_ON() in truncate/invalidate for hugetlb
        kasan: support use-after-scope detection
        kasan: update kasan_global for gcc 7
        lib/debugobjects: export for use in modules
        zram: fix unbalanced idr management at hot removal
        thp: fix corner case of munlock() of PTE-mapped THPs
        mm, thp: propagation of conditional compilation in khugepaged.c
      43c4f67c
    • Kirill A. Shutemov's avatar
      mm: fix false-positive WARN_ON() in truncate/invalidate for hugetlb · 5cbc198a
      Kirill A. Shutemov authored
      Hugetlb pages have ->index in size of the huge pages (PMD_SIZE or
      PUD_SIZE), not in PAGE_SIZE as other types of pages.  This means we
      cannot user page_to_pgoff() to check whether we've got the right page
      for the radix-tree index.
      
      Let's introduce page_to_index() which would return radix-tree index for
      given page.
      
      We will be able to get rid of this once hugetlb will be switched to
      multi-order entries.
      
      Fixes: fc127da0 ("truncate: handle file thp")
      Link: http://lkml.kernel.org/r/20161123093053.mjbnvn5zwxw5e6lk@black.fi.intel.comSigned-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarDoug Nelson <doug.nelson@intel.com>
      Tested-by: default avatarDoug Nelson <doug.nelson@intel.com>
      Reviewed-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Cc: <stable@vger.kernel.org>	[4.8+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5cbc198a
    • Dmitry Vyukov's avatar
      kasan: support use-after-scope detection · 828347f8
      Dmitry Vyukov authored
      Gcc revision 241896 implements use-after-scope detection.  Will be
      available in gcc 7.  Support it in KASAN.
      
      Gcc emits 2 new callbacks to poison/unpoison large stack objects when
      they go in/out of scope.  Implement the callbacks and add a test.
      
      [dvyukov@google.com: v3]
        Link: http://lkml.kernel.org/r/1479998292-144502-1-git-send-email-dvyukov@google.com
      Link: http://lkml.kernel.org/r/1479226045-145148-1-git-send-email-dvyukov@google.comSigned-off-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Acked-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: <stable@vger.kernel.org>	[4.0+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      828347f8
    • Dmitry Vyukov's avatar
      kasan: update kasan_global for gcc 7 · 045d599a
      Dmitry Vyukov authored
      kasan_global struct is part of compiler/runtime ABI.  gcc revision
      241983 has added a new field to kasan_global struct.  Update kernel
      definition of kasan_global struct to include the new field.
      
      Without this patch KASAN is broken with gcc 7.
      
      Link: http://lkml.kernel.org/r/1479219743-28682-1-git-send-email-dvyukov@google.comSigned-off-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Acked-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: <stable@vger.kernel.org>	[4.0+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      045d599a
    • Chris Wilson's avatar
      lib/debugobjects: export for use in modules · f8ff04e2
      Chris Wilson authored
      Drivers, or other modules, that use a mixture of objects (especially
      objects embedded within other objects) would like to take advantage of
      the debugobjects facilities to help catch misuse.  Currently, the
      debugobjects interface is only available to builtin drivers and requires
      a set of EXPORT_SYMBOL_GPL for use by modules.
      
      I am using the debugobjects in i915.ko to try and catch some invalid
      operations on embedded objects.  The problem currently only presents
      itself across module unload so forcing i915 to be builtin is not an
      option.
      
      Link: http://lkml.kernel.org/r/20161122143039.6433-1-chris@chris-wilson.co.ukSigned-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Cc: "Du, Changbin" <changbin.du@intel.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Christian Borntraeger <borntraeger@de.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f8ff04e2
    • Takashi Iwai's avatar
      zram: fix unbalanced idr management at hot removal · 529e71e1
      Takashi Iwai authored
      The zram hot removal code calls idr_remove() even when zram_remove()
      returns an error (typically -EBUSY).  This results in a leftover at the
      device release, eventually leading to a crash when the module is
      reloaded.
      
      As described in the bug report below, the following procedure would
      cause an Oops with zram:
      
       - provision three zram devices via modprobe zram num_devices=3
       - configure a size for each device
         + echo "1G" > /sys/block/$zram_name/disksize
       - mkfs and mount zram0 only
       - attempt to hot remove all three devices
         + echo 2 > /sys/class/zram-control/hot_remove
         + echo 1 > /sys/class/zram-control/hot_remove
         + echo 0 > /sys/class/zram-control/hot_remove
           - zram0 removal fails with EBUSY, as expected
       - unmount zram0
       - try zram0 hot remove again
         + echo 0 > /sys/class/zram-control/hot_remove
           - fails with ENODEV (unexpected)
       - unload zram kernel module
         + completes successfully
       - zram0 device node still exists
       - attempt to mount /dev/zram0
         + mount command is killed
         + following BUG is encountered
      
       BUG: unable to handle kernel paging request at ffffffffa0002ba0
       IP: get_disk+0x16/0x50
       Oops: 0000 [#1] SMP
       CPU: 0 PID: 252 Comm: mount Not tainted 4.9.0-rc6 #176
       Call Trace:
         exact_lock+0xc/0x20
         kobj_lookup+0xdc/0x160
         get_gendisk+0x2f/0x110
         __blkdev_get+0x10c/0x3c0
         blkdev_get+0x19d/0x2e0
         blkdev_open+0x56/0x70
         do_dentry_open.isra.19+0x1ff/0x310
         vfs_open+0x43/0x60
         path_openat+0x2c9/0xf30
         do_filp_open+0x79/0xd0
         do_sys_open+0x114/0x1e0
         SyS_open+0x19/0x20
         entry_SYSCALL_64_fastpath+0x13/0x94
      
      This patch adds the proper error check in hot_remove_store() not to call
      idr_remove() unconditionally.
      
      Fixes: 17ec4cd9 ("zram: don't call idr_remove() from zram_remove()")
      Bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=1010970
      Link: http://lkml.kernel.org/r/20161121132140.12683-1-tiwai@suse.deSigned-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      Reviewed-by: default avatarDavid Disseldorp <ddiss@suse.de>
      Reported-by: default avatarDavid Disseldorp <ddiss@suse.de>
      Tested-by: default avatarDavid Disseldorp <ddiss@suse.de>
      Acked-by: default avatarMinchan Kim <minchan@kernel.org>
      Acked-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
      Cc: <stable@vger.kernel.org>    [4.4+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      529e71e1
    • Kirill A. Shutemov's avatar
      thp: fix corner case of munlock() of PTE-mapped THPs · 655548bf
      Kirill A. Shutemov authored
      The following program triggers BUG() in munlock_vma_pages_range():
      
      	// autogenerated by syzkaller (http://github.com/google/syzkaller)
      	#include <sys/mman.h>
      
      	int main()
      	{
      	  mmap((void*)0x20105000ul, 0xc00000ul, 0x2ul, 0x2172ul, -1, 0);
      	  mremap((void*)0x201fd000ul, 0x4000ul, 0xc00000ul, 0x3ul, 0x203f0000ul);
      	  return 0;
      	}
      
      The test-case constructs the situation when munlock_vma_pages_range()
      finds PTE-mapped THP-head in the middle of page table and, by mistake,
      skips HPAGE_PMD_NR pages after that.
      
      As result, on the next iteration it hits the middle of PMD-mapped THP
      and gets upset seeing mlocked tail page.
      
      The solution is only skip HPAGE_PMD_NR pages if the THP was mlocked
      during munlock_vma_page().  It would guarantee that the page is
      PMD-mapped as we never mlock PTE-mapeed THPs.
      
      Fixes: e90309c9 ("thp: allow mlocked THP again")
      Link: http://lkml.kernel.org/r/20161115132703.7s7rrgmwttegcdh4@black.fi.intel.comSigned-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Cc: Konstantin Khlebnikov <koct9i@gmail.com>
      Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: syzkaller <syzkaller@googlegroups.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: <stable@vger.kernel.org>	[4.5+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      655548bf
    • Jérémy Lefaure's avatar
      mm, thp: propagation of conditional compilation in khugepaged.c · e1465d12
      Jérémy Lefaure authored
      Commit b46e756f ("thp: extract khugepaged from mm/huge_memory.c")
      moved code from huge_memory.c to khugepaged.c.  Some of this code should
      be compiled only when CONFIG_SYSFS is enabled but the condition around
      this code was not moved into khugepaged.c.
      
      The result is a compilation error when CONFIG_SYSFS is disabled:
      
        mm/built-in.o: In function `khugepaged_defrag_store': khugepaged.c:(.text+0x2d095): undefined reference to `single_hugepage_flag_store'
        mm/built-in.o: In function `khugepaged_defrag_show': khugepaged.c:(.text+0x2d0ab): undefined reference to `single_hugepage_flag_show'
      
      This commit adds the #ifdef CONFIG_SYSFS around the code related to
      sysfs.
      
      Link: http://lkml.kernel.org/r/20161114203448.24197-1-jeremy.lefaure@lse.epita.frSigned-off-by: default avatarJérémy Lefaure <jeremy.lefaure@lse.epita.fr>
      Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Acked-by: default avatarHillf Danton <hillf.zj@alibaba-inc.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e1465d12
  4. 30 Nov, 2016 6 commits
  5. 29 Nov, 2016 2 commits
    • Linus Torvalds's avatar
      Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 · 22d3d4fb
      Linus Torvalds authored
      Pull CIFS fixes from Steve French:
       "A few misc important cifs fixes, including a fix for a 4.9 regression
        in posix_acl xattr handling"
      
      * 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
        CIFS: iterate over posix acl xattr entry correctly in ACL_to_cifs_posix()
        Call echo service immediately after socket reconnect
        CIFS: Fix BUG() in calc_seckey()
      22d3d4fb
    • Linus Torvalds's avatar
      Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · ab59d1f4
      Linus Torvalds authored
      Pull SCSI fixes from James Bottomley:
       "Four small fixes.
      
        The be2iscsi is a potential device overrun in consistent memory, which
        could have nasty consequences if the consistent allocations are
        packed.
      
        The hpsa one fixes a regression where older controllers can now get a
        numbering clash between the first internal disk and the controller.
      
        The libfc one is a regression in timespec conversions which causes a
        user visible issue in a command line tool and the mpt3sas one fixes a
        regression where the controller could remain permanently blocked after
        an ATA pass through command followed by a reset"
      
      * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
        scsi: be2iscsi: allocate enough memory in beiscsi_boot_get_sinfo()
        scsi: mpt3sas: Unblock device after controller reset
        scsi: hpsa: use bus '3' for legacy HBA devices
        scsi: libfc: fix seconds_since_last_reset miscalculation
      ab59d1f4