• 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
perf-kmem.txt 1.71 KB