1. 19 Nov, 2014 5 commits
  2. 16 Nov, 2014 14 commits
  3. 12 Nov, 2014 1 commit
  4. 07 Nov, 2014 1 commit
  5. 06 Nov, 2014 4 commits
  6. 05 Nov, 2014 6 commits
    • Namhyung Kim's avatar
      perf tools: Make vmlinux short name more like kallsyms short name · 96d78059
      Namhyung Kim authored
      The previous patch changed kernel dso name from '[kernel.kallsyms]' to
      vmlinux.  However it might add confusion to old users accustomed to the
      old name.  So change the short name to '[kernel.vmlinux]' to reduce such
      confusion.
      
      Before:
        # Overhead  Command         Shared Object            Symbol
        # ........  ..............  .......................  ...............................
        #
             9.83%  swapper         vmlinux                  [k] intel_idle
             4.10%  awk             libc-2.20.so             [.] __strcmp_sse2
             1.86%  sed             libc-2.20.so             [.] __strcmp_sse2
             1.78%  netctl-auto     libc-2.20.so             [.] __strcmp_sse2
             1.23%  netctl-auto     libc-2.20.so             [.] __mbrtowc
             1.21%  firefox         libxul.so                [.] 0x00000000024b62bd
             1.20%  swapper         vmlinux                  [k] cpuidle_enter_state
             1.03%  sleep           vmlinux                  [k] copy_user_generic_unrolled
      
      After:
        # Overhead  Command         Shared Object            Symbol
        # ........  ..............  .......................  ...............................
        #
             9.83%  swapper         [kernel.vmlinux]         [k] intel_idle
             4.10%  awk             libc-2.20.so             [.] __strcmp_sse2
             1.86%  sed             libc-2.20.so             [.] __strcmp_sse2
             1.78%  netctl-auto     libc-2.20.so             [.] __strcmp_sse2
             1.23%  netctl-auto     libc-2.20.so             [.] __mbrtowc
             1.21%  firefox         libxul.so                [.] 0x00000000024b62bd
             1.20%  swapper         [kernel.vmlinux]         [k] cpuidle_enter_state
             1.03%  sleep           [kernel.vmlinux]         [k] copy_user_generic_unrolled
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-9-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      96d78059
    • Namhyung Kim's avatar
      perf tools: Fix build-id matching on vmlinux · b837a8bd
      Namhyung Kim authored
      There's a problem on finding correct kernel symbols when perf report
      runs on a different kernel.  Although a part of the problem was solved
      by the prior commit 0a7e6d1b ("perf tools: Check recorded kernel
      version when finding vmlinux"), there's a remaining problem still.
      
      When perf records samples, it synthesizes the kernel map using
      machine__mmap_name() and ref_reloc_sym like "[kernel.kallsyms]_text".
      You can easily see it using 'perf report -D' command.
      
      After finishing record, it goes through the recorded events to find
      maps/dsos actually used.  And then record build-id info of them.
      
      During this process, it needs to load symbols in a dso and it'd call
      dso__load_vmlinux_path() since the default value of the symbol_conf.
      try_vmlinux_path is true.  However it changes dso->long_name to a real
      path of the vmlinux file (e.g. /lib/modules/3.16.4/build/vmlinux) if one
      is running on a custom kernel.
      
      It resulted in that perf report reads the build-id of the vmlinux, but
      cannot use it since it only knows about the [kernel.kallsyms] map.  It
      then falls back to possible vmlinux paths by using the recorded kernel
      version (in case of a recent version) or a running kernel silently.
      
      Even with the recent tools, this still has a possibility of breaking
      the result.  As the build directory is a symbolic link, if one built a
      new kernel in the same directory with different source/config, the old
      link to vmlinux will point the new file.  So it's absolutely needed to
      use build-id when finding a kernel image.
      
      In this patch, it's now changed to try to search a kernel dso in the
      existing dso list which was constructed during build-id table parsing
      so it'll always have a build-id.  If not found, search "[kernel.kallsyms]".
      
      Before:
      
        $ perf report
        # Children      Self  Command  Shared Object      Symbol
        # ........  ........  .......  .................  ...............................
        #
            72.15%     0.00%  swapper  [kernel.kallsyms]  [k] set_curr_task_rt
            72.15%     0.00%  swapper  [kernel.kallsyms]  [k] native_calibrate_tsc
            72.15%     0.00%  swapper  [kernel.kallsyms]  [k] tsc_refine_calibration_work
            71.87%    71.87%  swapper  [kernel.kallsyms]  [k] module_finalize
         ...
      
      After (for the same perf.data):
      
            72.15%     0.00%  swapper  vmlinux  [k] cpu_startup_entry
            72.15%     0.00%  swapper  vmlinux  [k] arch_cpu_idle
            72.15%     0.00%  swapper  vmlinux  [k] default_idle
            71.87%    71.87%  swapper  vmlinux  [k] native_safe_halt
         ...
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Link: http://lkml.kernel.org/r/20140924073356.GB1962@gmail.com
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-8-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      b837a8bd
    • Namhyung Kim's avatar
      perf record: Do not save pathname in ./debug/.build-id directory for vmlinux · 00dc8657
      Namhyung Kim authored
      When perf record finishes a session, it pre-processes samples in order
      to write build-id info from DSOs that had samples.
      
      During this process it'll call map__load() for the kernel map, and it
      ends up calling dso__load_vmlinux_path() which replaces dso->long_name.
      
      But this function checks kernel's build-id before searching vmlinux path
      so it'll end up with a cryptic name, the pathname for the entry in the
      ~/.debug cache, which can be confusing to users.
      
      This patch adds a flag to skip the build-id check during record, so
      that it'll have the original vmlinux path for the kernel dso->long_name,
      not the entry in the ~/.debug cache.
      
      Before:
        # perf record -va sleep 3
        mmap size 528384B
        [ perf record: Woken up 1 times to write data ]
        [ perf record: Captured and wrote 0.196 MB perf.data (~8545 samples) ]
        Looking at the vmlinux_path (7 entries long)
        Using /home/namhyung/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551 for symbols
      
      After:
        # perf record -va sleep 3
        mmap size 528384B
        [ perf record: Woken up 1 times to write data ]
        [ perf record: Captured and wrote 0.193 MB perf.data (~8432 samples) ]
        Looking at the vmlinux_path (7 entries long)
        Using /lib/modules/3.16.4-1-ARCH/build/vmlinux for symbols
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-7-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      00dc8657
    • Namhyung Kim's avatar
      perf build-id: Move build-id related functions to util/build-id.c · e195fac8
      Namhyung Kim authored
      It'd be better managing those functions in a separate place as
      util/header.c file is already big.
      
      It now exports following 3 functions to others:
      
        bool perf_session__read_build_ids(struct perf_session *session, bool with_hits);
        int perf_session__write_buildid_table(struct perf_session *session, int fd);
        int perf_session__cache_build_ids(struct perf_session *session);
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
      Link: http://lkml.kernel.org/r/545733E7.6010105@intel.com
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-5-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      e195fac8
    • Namhyung Kim's avatar
      perf build-id: Rename dsos__write_buildid_table() · 714c9c4a
      Namhyung Kim authored
      The dsos__write_buildid_table() is not use struct dso and it mostly
      uses perf_session struct.
      
      So rename it to perf_session__write_buildid_ table() so that it
      corresponds to other related functions such as
      perf_session__read_build_ids() and perf_session__cache_build_ids().
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1415063674-17206-4-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      714c9c4a
    • Namhyung Kim's avatar
      perf tools: Add gzip decompression support for kernel module · e92ce12e
      Namhyung Kim authored
      Now my Archlinux box shows module symbols correctly.
      
      Before:
        $ perf report --stdio
        Failed to open /tmp/perf-3477.map, continuing without symbols
        no symbols found in /usr/bin/date, maybe install a debug package?
        No kallsyms or vmlinux with build-id 7b4ea0a49ae2111925857099aaf05c3246ff33e0 was found
        [drm] with build id 7b4ea0a49ae2111925857099aaf05c3246ff33e0 not found, continuing without symbols
        No kallsyms or vmlinux with build-id edd931629094b660ca9dec09a1b635c8d87aa2ee was found
        [jbd2] with build id edd931629094b660ca9dec09a1b635c8d87aa2ee not found, continuing without symbols
        No kallsyms or vmlinux with build-id a7b1eada671c34933e5610bb920b2ca4945a82c3 was found
        [ext4] with build id a7b1eada671c34933e5610bb920b2ca4945a82c3 not found, continuing without symbols
        No kallsyms or vmlinux with build-id d69511fa3e5840e770336ef45b06c83fef8d74e3 was found
        [scsi_mod] with build id d69511fa3e5840e770336ef45b06c83fef8d74e3 not found, continuing without symbols
        No kallsyms or vmlinux with build-id af0430af13461af058770ee9b87afc07922c2e77 was found
        [libata] with build id af0430af13461af058770ee9b87afc07922c2e77 not found, continuing without symbols
        No kallsyms or vmlinux with build-id aaeedff8160ce631a5f0333591c6ff291201d29f was found
        [libahci] with build id aaeedff8160ce631a5f0333591c6ff291201d29f not found, continuing without symbols
        No kallsyms or vmlinux with build-id c57907712becaf662dc4981824bb372c0441d605 was found
        [mac80211] with build id c57907712becaf662dc4981824bb372c0441d605 not found, continuing without symbols
        No kallsyms or vmlinux with build-id e0589077cc0ec8c3e4c40eb9f2d9e69d236bee8f was found
        [iwldvm] with build id e0589077cc0ec8c3e4c40eb9f2d9e69d236bee8f not found, continuing without symbols
        No kallsyms or vmlinux with build-id 2d86086bf136bf374a2f029cf85a48194f9b950b was found
        [cfg80211] with build id 2d86086bf136bf374a2f029cf85a48194f9b950b not found, continuing without symbols
        No kallsyms or vmlinux with build-id 4493c48599bdb3d91d0f8db5150e0be33fdd9221 was found
        [iwlwifi] with build id 4493c48599bdb3d91d0f8db5150e0be33fdd9221 not found, continuing without symbols
        ...
        #
        # Overhead  Command          Shared Object            Symbol
        # ........  ...............  .......................  ........................................................
        #
             0.03%  swapper          [ext4]                   [k] 0x000000000000fe2e
             0.03%  swapper          [kernel.kallsyms]        [k] account_entity_enqueue
             0.03%  swapper          [ext4]                   [k] 0x000000000000fc2b
             0.03%  irq/50-iwlwifi   [iwlwifi]                [k] 0x000000000000200b
             0.03%  swapper          [kernel.kallsyms]        [k] ktime_add_safe
             0.03%  swapper          [kernel.kallsyms]        [k] elv_completed_request
             0.03%  swapper          [libata]                 [k] 0x0000000000003997
             0.03%  swapper          [libahci]                [k] 0x0000000000001f25
             0.03%  swapper          [kernel.kallsyms]        [k] rb_next
             0.03%  swapper          [kernel.kallsyms]        [k] blk_finish_request
             0.03%  swapper          [ext4]                   [k] 0x0000000000010248
             0.00%  perf             [kernel.kallsyms]        [k] native_write_msr_safe
      
      After:
        $ perf report --stdio
        Failed to open /tmp/perf-3477.map, continuing without symbols
        no symbols found in /usr/bin/tr, maybe install a debug package?
        ...
        #
        # Overhead  Command          Shared Object                Symbol
        # ........  ...............  ...........................  ......................................................
        #
      
             0.04%  kworker/u16:3    [ext4]                       [k] ext4_read_block_bitmap
             0.03%  kworker/u16:0    [mac80211]                   [k] ieee80211_sta_reset_beacon_monitor
             0.02%  irq/50-iwlwifi   [mac80211]                   [k] ieee80211_get_bssid
             0.02%  firefox          [e1000e]                     [k] __ew32_prepare
             0.02%  swapper          [libahci]                    [k] ahci_handle_port_interrupt
             0.02%  emacs            libglib-2.0.so.0.4000.0      [.] g_mutex_unlock
             0.02%  swapper          [e1000e]                     [k] e1000_clean_tx_irq
             0.02%  dwm              [kernel.kallsyms]            [k] __schedule
             0.02%  gnome-terminal-  [vdso]                       [.] __vdso_clock_gettime
             0.02%  swapper          [e1000e]                     [k] e1000_alloc_rx_buffers
             0.02%  irq/50-iwlwifi   [mac80211]                   [k] ieee80211_rx
             0.01%  firefox          [vdso]                       [.] __vdso_gettimeofday
             0.01%  irq/50-iwlwifi   [iwlwifi]                    [k] iwl_pcie_rxq_restock.part.13
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Acked-by: default avatarJiri Olsa <jolsa@redhat.com>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Namhyung Kim <namhyung.kim@lge.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/87h9yexshi.fsf@sejong.aot.lge.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      e92ce12e
  7. 04 Nov, 2014 4 commits
  8. 03 Nov, 2014 5 commits