From: Andi Kleen <ak@linux.intel.com>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Jiri Olsa <jolsa@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 8/9] perf intel-pt: Update documentation about itrace G and L options
Date: Thu, 30 Apr 2020 05:28:58 -0700 [thread overview]
Message-ID: <20200430122858.GD874567@tassilo.jf.intel.com> (raw)
In-Reply-To: <0938999b-00c0-25cf-9a87-a7abc1cbac1c@intel.com>
> >
> > On Skylake/Goldmont the PEBS event contains the TSC and the time stamp reported by
> > perf should report the time the event was sampled based on that TSC.
> > Or is that not working for some reason?
>
> I guess it is not working like that, but perf tools would probably need
> special rules to sort the events because the they would break the rules of
> PERF_RECORD_FINISHED_ROUND, wouldn't they?
Yes it may violate finished round.
It should not be delayed longer than the next context switch though.
The documentation warning would be still correct, but only on Broadwell.
-Andi
next prev parent reply other threads:[~2020-04-30 12:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-29 15:07 [PATCH 0/9] perf intel-pt: Add support for synthesizing branch stacks for regular events Adrian Hunter
2020-04-29 15:07 ` [PATCH 1/9] perf thread-stack: Add branch stack support Adrian Hunter
2020-05-08 13:04 ` [tip: perf/core] " tip-bot2 for Adrian Hunter
2020-04-29 15:07 ` [PATCH 2/9] perf intel-pt: Consolidate thread-stack use condition Adrian Hunter
2020-05-08 13:04 ` [tip: perf/core] " tip-bot2 for Adrian Hunter
2020-04-29 15:07 ` [PATCH 3/9] perf intel-pt: Change branch stack support to use thread-stacks Adrian Hunter
2020-05-08 13:04 ` [tip: perf/core] " tip-bot2 for Adrian Hunter
2020-04-29 15:07 ` [PATCH 4/9] perf auxtrace: Add option to synthesize branch stack for regular events Adrian Hunter
2020-05-08 13:04 ` [tip: perf/core] " tip-bot2 for Adrian Hunter
2020-04-29 15:07 ` [PATCH 5/9] perf evsel: Add support for synthesized branch stack sample type Adrian Hunter
2020-05-08 13:04 ` [tip: perf/core] " tip-bot2 for Adrian Hunter
2020-04-29 15:07 ` [PATCH 6/9] perf thread-stack: Add thread_stack__br_sample_late() Adrian Hunter
2020-05-08 13:04 ` [tip: perf/core] " tip-bot2 for Adrian Hunter
2020-04-29 15:07 ` [PATCH 7/9] perf intel-pt: Add support for synthesizing branch stacks for regular events Adrian Hunter
2020-05-08 13:04 ` [tip: perf/core] " tip-bot2 for Adrian Hunter
2020-04-29 15:07 ` [PATCH 8/9] perf intel-pt: Update documentation about itrace G and L options Adrian Hunter
2020-04-29 23:03 ` Andi Kleen
2020-04-30 5:36 ` Adrian Hunter
2020-04-30 12:28 ` Andi Kleen [this message]
2020-05-08 13:04 ` [tip: perf/core] " tip-bot2 for Adrian Hunter
2020-04-29 15:07 ` [PATCH 9/9] perf intel-pt: Update documentation about using /proc/kcore Adrian Hunter
2020-05-08 13:04 ` [tip: perf/core] " tip-bot2 for Adrian Hunter
2020-04-29 18:29 ` [PATCH 0/9] perf intel-pt: Add support for synthesizing branch stacks for regular events Arnaldo Carvalho de Melo
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