1. 15 May, 2011 3 commits
    • Ingo Molnar's avatar
      Merge branch 'perf/urgent' of... · 52004ea7
      Ingo Molnar authored
      Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux-2.6 into perf/urgent
      52004ea7
    • Arnaldo Carvalho de Melo's avatar
      perf evlist: Fix per thread mmap setup · aece948f
      Arnaldo Carvalho de Melo authored
      The PERF_EVENT_IOC_SET_OUTPUT ioctl was returning -EINVAL when using
      --pid when monitoring multithreaded apps, as we can only share a ring
      buffer for events on the same thread if not doing per cpu.
      
      Fix it by using per thread ring buffers.
      
      Tested with:
      
      [root@felicio ~]# tuna -t 26131 -CP | nl
        1                      thread       ctxt_switches
        2    pid SCHED_ rtpri affinity voluntary nonvoluntary             cmd
        3 26131   OTHER     0      0,1  10814276      2397830 chromium-browse
        4  642    OTHER     0      0,1     14688            0 chromium-browse
        5  26148  OTHER     0      0,1    713602       115479 chromium-browse
        6  26149  OTHER     0      0,1    801958         2262 chromium-browse
        7  26150  OTHER     0      0,1   1271128          248 chromium-browse
        8  26151  OTHER     0      0,1         3            0 chromium-browse
        9  27049  OTHER     0      0,1     36796            9 chromium-browse
       10  618    OTHER     0      0,1     14711            0 chromium-browse
       11  661    OTHER     0      0,1     14593            0 chromium-browse
       12  29048  OTHER     0      0,1     28125            0 chromium-browse
       13  26143  OTHER     0      0,1   2202789          781 chromium-browse
      [root@felicio ~]#
      
      So 11 threads under pid 26131, then:
      
      [root@felicio ~]# perf record -F 50000 --pid 26131
      
      [root@felicio ~]# grep perf_event /proc/`pidof perf`/maps | nl
        1 7fa4a2538000-7fa4a25b9000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
        2 7fa4a25b9000-7fa4a263a000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
        3 7fa4a263a000-7fa4a26bb000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
        4 7fa4a26bb000-7fa4a273c000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
        5 7fa4a273c000-7fa4a27bd000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
        6 7fa4a27bd000-7fa4a283e000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
        7 7fa4a283e000-7fa4a28bf000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
        8 7fa4a28bf000-7fa4a2940000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
        9 7fa4a2940000-7fa4a29c1000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
       10 7fa4a29c1000-7fa4a2a42000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
       11 7fa4a2a42000-7fa4a2ac3000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
      [root@felicio ~]#
      
      11 mmaps, one per thread since we didn't specify any CPU list, so we need one
      mmap per thread and:
      
      [root@felicio ~]# perf record -F 50000 --pid 26131
      ^M
      ^C[ perf record: Woken up 79 times to write data ]
      [ perf record: Captured and wrote 20.614 MB perf.data (~900639 samples) ]
      
      [root@felicio ~]# perf report -D | grep PERF_RECORD_SAMPLE | cut -d/ -f2 | cut -d: -f1 | sort -n | uniq -c | sort -nr | nl
           1	 371310 26131
           2	  96516 26148
           3	  95694 26149
           4	  95203 26150
           5	   7291 26143
           6	     87 27049
           7	     76 661
           8	     60 29048
           9	     47 618
          10	     43 642
      [root@felicio ~]#
      
      Ok, one of the threads, 26151 was quiescent, so no samples there, but all the
      others are there.
      
      Then, if I specify one CPU:
      
      [root@felicio ~]# perf record -F 50000 --pid 26131 --cpu 1
      ^C[ perf record: Woken up 1 times to write data ]
      [ perf record: Captured and wrote 0.680 MB perf.data (~29730 samples) ]
      
      [root@felicio ~]# perf report -D | grep PERF_RECORD_SAMPLE | cut -d/ -f2 | cut -d: -f1 | sort -n | uniq -c | sort -nr | nl
           1	   8444 26131
           2	   2584 26149
           3	   2518 26148
           4	   2324 26150
           5	    123 26143
           6	      9 661
           7	      9 29048
      [root@felicio ~]#
      
      This machine has two cores, so fewer threads appeared on the radar, and:
      
      [root@felicio ~]# grep perf_event /proc/`pidof perf`/maps | nl
       1 7f484b922000-7f484b9a3000 rwxs 00000000 00:09 4064 anon_inode:[perf_event]
      [root@felicio ~]#
      
      Just one mmap, as now we can use just one per-cpu buffer instead of the
      per-thread needed in the previous case.
      
      For global profiling:
      
      [root@felicio ~]# perf record -F 50000 -a
      ^C[ perf record: Woken up 26 times to write data ]
      [ perf record: Captured and wrote 7.128 MB perf.data (~311412 samples) ]
      
      [root@felicio ~]# grep perf_event /proc/`pidof perf`/maps | nl
           1	7fb49b435000-7fb49b4b6000 rwxs 00000000 00:09 4064                       anon_inode:[perf_event]
           2	7fb49b4b6000-7fb49b537000 rwxs 00000000 00:09 4064                       anon_inode:[perf_event]
      [root@felicio ~]#
      
      It uses per-cpu buffers.
      
      For just one thread:
      
      [root@felicio ~]# perf record -F 50000 --tid 26148
      ^C[ perf record: Woken up 2 times to write data ]
      [ perf record: Captured and wrote 0.330 MB perf.data (~14426 samples) ]
      
      [root@felicio ~]# perf report -D | grep PERF_RECORD_SAMPLE | cut -d/ -f2 | cut -d: -f1 | sort -n | uniq -c | sort -nr | nl
           1	   9969 26148
      [root@felicio ~]#
      
      [root@felicio ~]# grep perf_event /proc/`pidof perf`/maps | nl
           1	7f286a51b000-7f286a59c000 rwxs 00000000 00:09 4064                       anon_inode:[perf_event]
      [root@felicio ~]#
      Tested-by: default avatarDavid Ahern <dsahern@gmail.com>
      Tested-by: default avatarLin Ming <ming.m.lin@intel.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      Link: http://lkml.kernel.org/r/20110426204401.GB1746@ghostprotocols.netSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      aece948f
    • Arnaldo Carvalho de Melo's avatar
      perf tools: Honour the cpu list parameter when also monitoring a thread list · b9019418
      Arnaldo Carvalho de Melo authored
      The perf_evlist__create_maps was discarding the --cpu parameter when a
      --pid or --tid was specified, fix that.
      
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      Link: http://lkml.kernel.org/r/20110426204401.GB1746@ghostprotocols.netSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      b9019418
  2. 11 May, 2011 1 commit
  3. 10 May, 2011 2 commits
  4. 09 May, 2011 27 commits
  5. 08 May, 2011 6 commits
  6. 07 May, 2011 1 commit