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From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
To: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	linux-kernel@vger.kernel.org, Will Deacon <will.deacon@arm.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Markus Metzger <markus.t.metzger@intel.com>
Subject: Re: [PATCH v2] perf: Suppress AUX/OVERWRITE records
Date: Fri, 4 May 2018 15:09:59 +0300	[thread overview]
Message-ID: <20180504120959.z6cik4zv6ragblxd@um.fi.intel.com> (raw)
In-Reply-To: <20180404145323.28651-1-alexander.shishkin@linux.intel.com>

On Wed, Apr 04, 2018 at 05:53:23PM +0300, Alexander Shishkin wrote:
> It has been pointed out to me many times that it is useful to be able
> to switch off AUX records to save the bandwidth for records that actually
> matter, for example, in AUX overwrite mode.
> 
> The usefulness of PERF_RECORD_AUX is in some of its flags, like the
> TRUNCATED flag that tells the decoder where exactly gaps in the trace are.
> The OVERWRITE flag, on the other hand will be set on every single record
> in overwrite mode. However, a PERF_RECORD_AUX[flags=OVERWRITE] is
> generated on every target task's sched_out, which over time adds up to
> a lot of useless information.
> 
> If any folks out there have userspace that depends on a constant stream of
> OVERWRITE records for a good reason, they'll have to let us know.
> 
> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
> Cc: Markus Metzger <markus.t.metzger@intel.com>
> Cc: Adrian Hunter <adrian.hunter@intel.com>

This one seems to be slipping through the cracks.

Cheers,
--
Alex

  reply	other threads:[~2018-05-04 12:10 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-14 12:30 [PATCH v1 0/4] perf: Allow suppressing useless AUX records Alexander Shishkin
2017-11-14 12:30 ` [PATCH v1 1/4] perf: Allow suppressing " Alexander Shishkin
2017-11-15 12:00   ` Peter Zijlstra
2018-01-15 15:00     ` [PATCH] " Alexander Shishkin
2018-03-29 11:54       ` Peter Zijlstra
2018-03-31  9:35         ` Ingo Molnar
2018-04-03 17:32           ` Will Deacon
2018-04-04 14:53             ` [PATCH v2] perf: Suppress AUX/OVERWRITE records Alexander Shishkin
2018-05-04 12:09               ` Alexander Shishkin [this message]
2018-05-04 15:35                 ` Arnaldo Carvalho de Melo
2018-05-04 15:36                   ` Arnaldo Carvalho de Melo
2018-09-25  9:27               ` [tip:perf/core] " tip-bot for Alexander Shishkin
2017-11-14 12:30 ` [PATCH v1 2/4] tools, perf_event.h: Synchronize Alexander Shishkin
2017-11-14 12:30 ` [PATCH v1 3/4] perf tools: Add 'suppress_aux' attribute bit definition and fallback Alexander Shishkin
2017-11-14 12:30 ` [PATCH v1 4/4] perf intel-pt, intel-bts: Suppress useless AUX records by default Alexander Shishkin

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