Re: [PATCH v2] perf: Suppress AUX/OVERWRITE records

[Alexander Shishkin]

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@xxxxxxxxxxxxxxx>
> Cc: Markus Metzger <markus.t.metzger@xxxxxxxxx>
> Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>

This one seems to be slipping through the cracks.

Cheers,
--
Alex