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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 4 May 2018 12:35:34 -0300
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Will Deacon <will.deacon@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Markus Metzger <markus.t.metzger@...el.com>
Subject: Re: [PATCH v2] perf: Suppress AUX/OVERWRITE records

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@...ux.intel.com>
> > Cc: Markus Metzger <markus.t.metzger@...el.com>
> > Cc: Adrian Hunter <adrian.hunter@...el.com>
> 
> This one seems to be slipping through the cracks.

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


- Arnaldo