linux-kernel - Re: [PATCH V2 00/11] perf intel-pt: Add perf event clocks to better support VM tracing

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Date:   Tue, 1 Mar 2022 13:06:53 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        kvm@...r.kernel.org, H Peter Anvin <hpa@...or.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Leo Yan <leo.yan@...aro.org>
Subject: Re: [PATCH V2 00/11] perf intel-pt: Add perf event clocks to better
 support VM tracing

On 21/02/2022 08:54, Adrian Hunter wrote:
> On 14/02/2022 13:09, Adrian Hunter wrote:
>> Hi
>>
>> These patches add 2 new perf event clocks based on TSC for use with VMs.
>>
>> The first patch is a minor fix, the next 2 patches add each of the 2 new
>> clocks.  The remaining patches add minimal tools support and are based on
>> top of the Intel PT Event Trace tools' patches.
>>
>> The future work, to add the ability to use perf inject to inject perf
>> events from a VM guest perf.data file into a VM host perf.data file,
>> has yet to be implemented.
>>
>>
>> Changes in V2:
>>       perf/x86: Fix native_perf_sched_clock_from_tsc() with __sched_clock_offset
>> 	  Add __sched_clock_offset unconditionally
>>
>>       perf/x86: Add support for TSC as a perf event clock
>> 	  Use an attribute bit 'ns_clockid' to identify non-standard clockids
>>
>>       perf/x86: Add support for TSC in nanoseconds as a perf event clock
>> 	  Do not affect use of __sched_clock_offset
>> 	  Adjust to use 'ns_clockid'
> 
> Any comments on version 2?

☺/