linux-kernel - Re: [PATCH v2 1/2] perf cs-etm: Support unknown_thread in cs_etm

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Message-ID: <20180510035618.GD12205@leoy-ThinkPad-X240s>
Date:   Thu, 10 May 2018 11:56:18 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        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@...ts.linaro.org
Subject: Re: [PATCH v2 1/2] perf cs-etm: Support unknown_thread in
 cs_etm_auxtrace

On Wed, May 09, 2018 at 09:51:50AM -0600, Mathieu Poirier wrote:
> On Wed, May 09, 2018 at 12:15:11PM +0800, Leo Yan wrote:
> > CoreSight doesn't allocate thread structure for unknown_thread in etm
> > auxtrace, so unknown_thread is NULL pointer.  If the perf data doesn't
> > contain valid tid and then cs_etm__mem_access() uses unknown_thread
> > instead as thread handler, this results in segmentation fault when
> > thread__find_addr_map() accesses thread handler.
> > 
> > This commit creates new thread data which is used by unknown_thread, so
> > CoreSight tracing can roll back to use unknown_thread if perf data
> > doesn't include valid thread info.  This commit also releases thread
> > data for initialization failure case and for normal auxtrace free flow.
> 
> Hi Leo,
> 
> Arnaldo maintains the perf tools and he receives dozens of patches every day.
> If his name is not the first one to appear on the "To:" list, it is unlikely
> that his email filters will catch your patches.

Thanks for reminding, Mathieu.  Will resend patches for this.

Thanks,
Leo Yan