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From: Leo Yan <leo.yan@linaro.org>
To: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, coresight@lists.linaro.org
Subject: Re: [PATCH v2 1/2] perf cs-etm: Support unknown_thread in cs_etm_auxtrace
Date: Thu, 10 May 2018 11:56:18 +0800	[thread overview]
Message-ID: <20180510035618.GD12205@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <20180509155150.GC25559@xps15>

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

WARNING: multiple messages have this Message-ID (diff)
From: leo.yan@linaro.org (Leo Yan)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/2] perf cs-etm: Support unknown_thread in cs_etm_auxtrace
Date: Thu, 10 May 2018 11:56:18 +0800	[thread overview]
Message-ID: <20180510035618.GD12205@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <20180509155150.GC25559@xps15>

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

  reply	other threads:[~2018-05-10  3:56 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-09  4:15 [PATCH v2 1/2] perf cs-etm: Support unknown_thread in cs_etm_auxtrace Leo Yan
2018-05-09  4:15 ` Leo Yan
2018-05-09  4:15 ` [PATCH v2 2/2] perf cs-etm: Remove redundant space Leo Yan
2018-05-09  4:15   ` Leo Yan
2018-05-09 15:51 ` [PATCH v2 1/2] perf cs-etm: Support unknown_thread in cs_etm_auxtrace Mathieu Poirier
2018-05-09 15:51   ` Mathieu Poirier
2018-05-10  3:56   ` Leo Yan [this message]
2018-05-10  3:56     ` Leo Yan

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