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Date: Fri, 4 May 2018 12:35:34 -0300
From: Arnaldo Carvalho de Melo <acme@redhat.com>
To: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Ingo Molnar <mingo@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
Message-ID: <20180504153534.GB2700@redhat.com>
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Em Fri, May 04, 2018 at 03:09:59PM +0300, Alexander Shishkin escreveu:
> 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.

So, did you got Acked-by  or tested-by from anyone?


- Arnaldo