1. 21 6月, 2017 1 次提交
    • K
      perf stat: Add support to measure SMI cost · daefd0bc
      Kan Liang 提交于
      Implementing a new --smi-cost mode in perf stat to measure SMI cost.
      
      During the measurement, the /sys/device/cpu/freeze_on_smi will be set.
      
      The measurement can be done with one counter (unhalted core cycles), and
      two free running MSR counters (IA32_APERF and SMI_COUNT).
      
      In practice, the percentages of SMI core cycles should be more useful
      than absolute value. So the output will be the percentage of SMI core
      cycles and SMI#. metric_only will be set by default.
      
      SMI cycles% = (aperf - unhalted core cycles) / aperf
      
      Here is an example output.
      
       Performance counter stats for 'sudo echo ':
      
      SMI cycles%          SMI#
          0.1%              1
      
             0.010858678 seconds time elapsed
      
      Users who wants to get the actual value can apply additional
      --no-metric-only.
      Signed-off-by: NKan Liang <Kan.liang@intel.com>
      Acked-by: NJiri Olsa <jolsa@kernel.org>
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: Kan Liang <kan.liang@intel.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Robert Elliott <elliott@hpe.com>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1495825538-5230-3-git-send-email-kan.liang@intel.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      daefd0bc
  2. 23 3月, 2017 1 次提交
    • A
      perf stat: Output JSON MetricExpr metric · 37932c18
      Andi Kleen 提交于
      Add generic infrastructure to perf stat to output ratios for
      "MetricExpr" entries in the event lists. Many events are more useful as
      ratios than in raw form, typically some count in relation to total
      ticks.
      
      Transfer the MetricExpr information from the alias to the evsel.
      
      We mark the events that need to be collected for MetricExpr, and also
      link the events using them with a pointer. The code is careful to always
      prefer the right event in the same group to minimize multiplexing
      errors. At the moment only a single relation is supported.
      
      Then add a rblist to the stat shadow code that remembers stats based on
      the cpu and context.
      
      Then finally update and retrieve and print these values similarly to the
      existing hardcoded perf metrics. We use the simple expression parser
      added earlier to evaluate the expression.
      
      Normally we just output the result without further commentary, but for
      --metric-only this would lead to empty columns. So for this case use the
      original event as description.
      
      There is no attempt to automatically add the MetricExpr event, if it is
      missing, however we suggest it to the user, because the user tool
      doesn't have enough information to reliably construct a group that is
      guaranteed to schedule. So we leave that to the user.
      
        % perf stat -a -I 1000 -e '{unc_p_clockticks,unc_p_freq_max_os_cycles}'
             1.000147889        800,085,181      unc_p_clockticks
             1.000147889         93,126,241      unc_p_freq_max_os_cycles  #     11.6
             2.000448381        800,218,217      unc_p_clockticks
             2.000448381        142,516,095      unc_p_freq_max_os_cycles  #     17.8
             3.000639852        800,243,057      unc_p_clockticks
             3.000639852        162,292,689      unc_p_freq_max_os_cycles  #     20.3
      
        % perf stat -a -I 1000 -e '{unc_p_clockticks,unc_p_freq_max_os_cycles}' --metric-only
        #    time         freq_max_os_cycles %
             1.000127077      0.9
             2.000301436      0.7
             3.000456379      0.0
      
      v2: Change from DivideBy to MetricExpr
      v3: Use expr__ prefix.  Support more than one other event.
      v4: Update description
      v5: Only print warning message once for multiple PMUs.
      Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      Acked-by: NJiri Olsa <jolsa@kernel.org>
      Link: http://lkml.kernel.org/r/20170320201711.14142-11-andi@firstfloor.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      37932c18
  3. 07 6月, 2016 1 次提交
  4. 03 3月, 2016 1 次提交
  5. 17 2月, 2016 1 次提交
    • A
      perf stat: Abstract stat metrics printing · 140aeadc
      Andi Kleen 提交于
      Abstract the printing of shadow metrics. Instead of every metric calling
      fprintf directly and taking care of indentation, use two call backs: one
      to print metrics and another to start a new line.
      
      This will allow adding metrics to CSV mode and also using them for other
      purposes.
      
      The computation of padding is now done in the central callback, instead
      of every metric doing it manually.  This makes it easier to add new
      metrics.
      
      v2: Refactor functions, printout now does more. Move
      shadow printing. Improve fallback callbacks. Don't
      use void * callback data.
      v3: Remove unnecessary hunk. Add typedef for new_line
      v4: Remove unnecessary hunk. Don't print metrics for CSV/interval
      mode yet.  Move printout change to separate patch.
      v5: Fix bisect bugs. Avoid bogus frontend cycles printing.
      Fix indentation in different aggregation modes.
      v6: Delay newline handling
      Signed-off-by: NAndi Kleen <ak@linux.intel.com>
      Acked-by: NJiri Olsa <jolsa@redhat.com>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1454173616-17710-2-git-send-email-andi@firstfloor.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      140aeadc
  6. 26 1月, 2016 1 次提交
  7. 18 12月, 2015 2 次提交
  8. 20 10月, 2015 2 次提交
  9. 09 8月, 2015 1 次提交
  10. 07 8月, 2015 5 次提交
  11. 26 6月, 2015 9 次提交
  12. 16 6月, 2015 2 次提交
  13. 08 6月, 2015 3 次提交
  14. 02 5月, 2014 1 次提交
  15. 08 8月, 2013 1 次提交
  16. 18 9月, 2012 1 次提交