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Re: [PATCH 0/3]measure SMI cost

From Andi Kleen <ak@linux.intel.com>
Newsgroups linux.kernel
Subject Re: [PATCH 0/3]measure SMI cost
Date 2017-03-24 12:50 +0100
Message-ID <tovTb-VO-15@gated-at.bofh.it> (permalink)
References <tofOp-6a9-23@gated-at.bofh.it> <tot4Z-7ku-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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> > A new --smi-cost mode in perf stat is implemented to measure the SMI cost
> > by calculating cycles and aperf results. In practice, the percentages of
> > SMI cycles should be more useful than absolute value.
> 
> That's only true for performance oriented analysis, but for analyzing the
> root cause of latencies the actual cycles are definitely interesting.

perf stat also prints the absolute cycles of course (unless you do --metric-only)

It cannot print individual cycles (per SMI occurrence), the only
way to do that would be to poll constantly.

-Andi

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[PATCH 0/3]measure SMI cost kan.liang@intel.com - 2017-03-23 19:40 +0100
  [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI kan.liang@intel.com - 2017-03-23 19:40 +0100
    Re: [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI Peter Zijlstra <peterz@infradead.org> - 2017-03-23 21:40 +0100
      Re: [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI Thomas Gleixner <tglx@linutronix.de> - 2017-03-24 09:40 +0100
        RE: [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI "Liang, Kan" <kan.liang@intel.com> - 2017-03-24 15:20 +0100
          Re: [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI Peter Zijlstra <peterz@infradead.org> - 2017-03-24 15:30 +0100
    Re: [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI Peter Zijlstra <peterz@infradead.org> - 2017-03-23 21:40 +0100
      RE: [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI "Liang, Kan" <kan.liang@intel.com> - 2017-03-23 21:50 +0100
      Re: [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI Andi Kleen <ak@linux.intel.com> - 2017-03-23 23:30 +0100
        Re: [PATCH 1/3] perf/x86: add sysfs entry to freeze counter on SMI Peter Zijlstra <peterz@infradead.org> - 2017-03-24 09:20 +0100
  [PATCH 3/3] perf stat: Add support to measure SMI cost kan.liang@intel.com - 2017-03-23 19:40 +0100
  Re: [PATCH 0/3]measure SMI cost Thomas Gleixner <tglx@linutronix.de> - 2017-03-24 09:50 +0100
    Re: [PATCH 0/3]measure SMI cost Andi Kleen <ak@linux.intel.com> - 2017-03-24 12:50 +0100
      Re: [PATCH 0/3]measure SMI cost Thomas Gleixner <tglx@linutronix.de> - 2017-03-24 13:10 +0100
        RE: [PATCH 0/3]measure SMI cost "Liang, Kan" <kan.liang@intel.com> - 2017-03-24 15:20 +0100

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