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  1. 12 1月, 2016 8 次提交
  3. 11 1月, 2016 1 次提交
  5. 09 1月, 2016 8 次提交
  7. 08 1月, 2016 19 次提交
  9. 07 1月, 2016 4 次提交
    • A
      perf tests: No need to set attr.sample_freq in the perf time to TSC test · 4f4ba0e6
      由 Arnaldo Carvalho de Melo 提交于 
      We were asking for a 4kHz sample_freq, making the test fail needlessly
when the system reduced /proc/sys/kernel/perf_event_max_sample_rate
below that.

In this test we only look at the PERF_SAMPLE_TIME fields in PERF_RECORD_
meta events, no need to set sample_freq.

Thanks to Namhyung for suggesting that max_sample_rate could be the
reason for the test failure, seeing the 'perf test -vv' output I sent.

Before:

  # echo 1000 > /proc/sys/kernel/perf_event_max_sample_rate
  # perf test TSC
  45: Test converting perf time to TSC   : FAILED!

After:

  # perf test TSC
  45: Test converting perf time to TSC   : Ok
  # cat /proc/sys/kernel/perf_event_max_sample_rate
  1000

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-lcob05qhawkuvsyuu9g1fld5@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      4f4ba0e6
    • S
      perf pmu: fix alias->snapshot missing initialization bug · 84530920
      由 Stephane Eranian 提交于 
      This patch fixes a bug in __perf_pmu__new_alias() whereby the
alias->snapshot field was not initialized to false. This led to random
alias->snapshot value for an alias and was breaking some measurements
such as:

  $ perf stat -a -e uncore_imc/data_reads/ -I 1000 sleep 100

Because the event ended up being treated as snapshot mode, when it is
not.
Signed-off-by: NStephane Eranian <eranian@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1452106201-13073-1-git-send-email-eranian@google.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      84530920
    • J
      perf script: Add stat-cpi.py script · b8a1962d
      由 Jiri Olsa 提交于 
      Adding stat-cpi.py as an example of how to do stat scripting.

It computes the CPI metrics from cycles and instructions events.

The CPI is based performance metric showing the Cycles Per Instructions
ratio, which helps to identify cycles-hungry code.

Following stat record/report/script combinations could be used:

- get CPI for given workload

    $ perf stat -e cycles,instructions record ls

    SNIP

     Performance counter stats for 'ls':

             2,904,431      cycles
             3,346,878      instructions              #    1.15  insns per cycle

           0.001782686 seconds time elapsed

    $ perf script -s ./scripts/python/stat-cpi.py
           0.001783: cpu -1, thread -1 -> cpi 0.867803 (2904431/3346878)

    $ perf stat -e cycles,instructions record ls | perf script -s ./scripts/python/stat-cpi.py

    SNIP

           0.001730: cpu -1, thread -1 -> cpi 0.869026 (2928292/3369627)

- get CPI systemwide:

    $ perf stat -e cycles,instructions -a -I 1000 record sleep 3
    #           time             counts unit events
         1.000158618        594,274,711      cycles                     (100.00%)
         1.000158618        441,898,250      instructions
         2.000350973        567,649,705      cycles                     (100.00%)
         2.000350973        432,669,206      instructions
         3.000559210        561,940,430      cycles                     (100.00%)
         3.000559210        420,403,465      instructions
         3.000670798            780,105      cycles                     (100.00%)
         3.000670798            326,516      instructions

    $ perf script -s ./scripts/python/stat-cpi.py
           1.000159: cpu -1, thread -1 -> cpi 1.344823 (594274711/441898250)
           2.000351: cpu -1, thread -1 -> cpi 1.311972 (567649705/432669206)
           3.000559: cpu -1, thread -1 -> cpi 1.336669 (561940430/420403465)
           3.000671: cpu -1, thread -1 -> cpi 2.389178 (780105/326516)

    $ perf stat -e cycles,instructions -a -I 1000 record sleep 3 | perf script -s ./scripts/python/stat-cpi.py
           1.000202: cpu -1, thread -1 -> cpi 1.035091 (940778881/908885530)
           2.000392: cpu -1, thread -1 -> cpi 1.442600 (627493992/434974455)
           3.000545: cpu -1, thread -1 -> cpi 1.353612 (741463930/547766890)
           3.000622: cpu -1, thread -1 -> cpi 2.642110 (784083/296764)
Signed-off-by: NJiri Olsa <jolsa@kernel.org>
Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: NKan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1452077397-31958-4-git-send-email-jolsa@kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      b8a1962d
    • J
      perf script: Display stat events by default · 36e33c53
      由 Jiri Olsa 提交于 
      If no script is specified for stat data, display stat events in raw
form.

  $ perf stat record ls

  SNIP

   Performance counter stats for 'ls':

            0.851585      task-clock (msec)         #    0.717 CPUs utilized
                   0      context-switches          #    0.000 K/sec
                   0      cpu-migrations            #    0.000 K/sec
                 114      page-faults               #    0.134 M/sec
           2,620,918      cycles                    #    3.078 GHz
     <not supported>      stalled-cycles-frontend
     <not supported>      stalled-cycles-backend
           2,714,111      instructions              #    1.04  insns per cycle
             542,434      branches                  #  636.970 M/sec
              15,946      branch-misses             #    2.94% of all branches

         0.001186954 seconds time elapsed

  $ perf script
  CPU   THREAD             VAL             ENA             RUN            TIME EVENT
   -1    26185          851585          851585          851585         1186954 task-clock
   -1    26185               0          851585          851585         1186954 context-switches
   -1    26185               0          851585          851585         1186954 cpu-migrations
   -1    26185             114          851585          851585         1186954 page-faults
   -1    26185         2620918          853340          853340         1186954 cycles
   -1    26185               0               0               0         1186954 stalled-cycles-frontend
   -1    26185               0               0               0         1186954 stalled-cycles-backend
   -1    26185         2714111          853340          853340         1186954 instructions
   -1    26185          542434          853340          853340         1186954 branches
   -1    26185           15946          853340          853340         1186954 branch-misses
Signed-off-by: NJiri Olsa <jolsa@kernel.org>
Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: NKan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1452077397-31958-3-git-send-email-jolsa@kernel.org
[ Rename 'time' parameter to 'tstamp' to fix build on older distros ]
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      36e33c53