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: Wed, 29 Apr 2020 16:03:56 -0700 [thread overview]
Message-ID: <20200429230356.GB874567@tassilo.jf.intel.com> (raw)
In-Reply-To: <20200429150751.12570-9-adrian.hunter@intel.com>
> +One caveat with the G and L options is that they work poorly with "Large PEBS".
> +Large PEBS means PEBS records will be accumulated by hardware and the written
> +into the event buffer in one go. That reduces interrupts, but can give very
> +late timestamps. Because the Intel PT trace is synchronized by timestamps,
Are you refering to Broadwell here?
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?
-Andi
next prev parent reply other threads:[~2020-04-29 23:03 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 [this message]
2020-04-30 5:36 ` Adrian Hunter
2020-04-30 12:28 ` Andi Kleen
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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