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Cc:     Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v2 0/7] PMU performance improvements
Date:   Tue, 17 Oct 2023 12:55:29 -0700
Message-ID: <169757198792.167943.8358990853717369246.b4-ty@kernel.org>
In-Reply-To: <20231012175645.1849503-1-irogers@google.com>
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On Thu, 12 Oct 2023 10:56:38 -0700, Ian Rogers wrote:
> Performance improvements to pmu scanning by holding onto the
> event/metric tables for a cpuid (avoid regular expression comparisons)
> and by lazily computing the default perf_event_attr for a PMU.
> 
> Before
> % Running 'internals/pmu-scan' benchmark:
> Computing performance of sysfs PMU event scan for 100 times
>   Average core PMU scanning took: 251.990 usec (+- 4.009 usec)
>   Average PMU scanning took: 3222.460 usec (+- 211.234 usec)
> % Running 'internals/pmu-scan' benchmark:
> Computing performance of sysfs PMU event scan for 100 times
>   Average core PMU scanning took: 260.120 usec (+- 7.905 usec)
>   Average PMU scanning took: 3228.995 usec (+- 211.196 usec)
> % Running 'internals/pmu-scan' benchmark:
> Computing performance of sysfs PMU event scan for 100 times
>   Average core PMU scanning took: 252.310 usec (+- 3.980 usec)
>   Average PMU scanning took: 3220.675 usec (+- 210.844 usec)
> 
> [...]

Applied to perf-tools-next, thanks!