linux-kernel - Re: [PATCH v5 0/5] perf cs-etm: Fix synthesizing instruction samples

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Date:   Tue, 10 Mar 2020 08:45:03 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Robert Walker <robert.walker@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Coresight ML <coresight@...ts.linaro.org>
Subject: Re: [PATCH v5 0/5] perf cs-etm: Fix synthesizing instruction samples

Em Tue, Mar 10, 2020 at 01:43:05PM +0800, Leo Yan escreveu:
> Hi Arnaldo,
> 
> On Wed, Feb 19, 2020 at 10:18:06AM +0800, Leo Yan wrote:
> > This patch series is to address issues for synthesizing instruction
> > samples, especially when the instruction sample period is small enough,
> > the current logic cannot synthesize multiple instruction samples within
> > one instruction range packet.
> > 
> > Patch 0001 is to swap packets for instruction samples, so this allow
> > option '--itrace=iNNN' can work well.
> > 
> > Patch 0002 avoids to reset the last branches for every instruction
> > sample; if reset the last branches for every time generating sample, the
> > later samples in the same range packet cannot use the last branches
> > anymore.
> > 
> > Patch 0003 is the fixing for handling different instruction periods,
> > especially for small sample period.
> > 
> > Patch 0004 is an optimization for copying last branches; it only copies
> > last branches once if the instruction samples share the same last
> > branches.
> > 
> > Patch 0005 is a minor fix for unsigned variable comparison to zero.
> > 
> > This patch set has been rebased on the latest perf/core branch; and
> > verified on Juno board with below commands:
> > 
> >   # perf script --itrace=i2
> >   # perf script --itrace=i2il16
> >   # perf inject --itrace=i2il16 -i perf.data -o perf.data.new
> >   # perf inject --itrace=i100il16 -i perf.data -o perf.data.new
> 
> Could you pick up this patch set?  I confirmed this patch set can
> cleanly apply on top of the latest mainline kernel (5.6-rc5).
> 
> Or if you want me to resend this patch set, please feel free let me
> know.  Thanks!

Thanks, all build tested on x86 and arm64 (with CORESIGHT=1, etc), applied.

- Arnaldo