From: Leo Yan <leo.yan@linaro.org>
To: Denis Nikitin <denik@google.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Mike Leach <mike.leach@linaro.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
John Garry <john.garry@huawei.com>, Will Deacon <will@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Jiri Olsa <jolsa@redhat.com>,
Namhyung Kim <namhyung@kernel.org>,
Daniel Kiss <daniel.kiss@arm.com>,
Coresight ML <coresight@lists.linaro.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-perf-users@vger.kernel.org
Subject: Re: [PATCH v1 0/3] coresight: Fix for snapshot mode
Date: Sat, 12 Jun 2021 11:27:21 +0800 [thread overview]
Message-ID: <20210612032721.GB36748@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <CAOYpmdE=pSaDGOm+4iCh611DXVD766eCr5dACQ+TgOnSO=4EOA@mail.gmail.com>
On Fri, Jun 11, 2021 at 01:31:41AM -0700, Denis Nikitin wrote:
> Hi Suzuki,
>
> On Thu, Jun 10, 2021 at 9:04 AM Suzuki K Poulose <suzuki.poulose@arm.com> wrote:
> >
> [...]
> >
> > Are you able to confirm if the patch 3 alone fixes the above issue ?
> > I am not convinced that Patch 1 is necessary.
> >
>
> Yes. "perf cs-etm: Remove callback cs_etm_find_snapshot()" alone fixes
> the issue.
Based on current testing result, we should give high priority for
patches 2 and 3.
The patch 1 is controversial for how to handle the trace data kept
in multiple AUX buffers; essentially it's up to how we understand the
snapshot definition. I confirmed Intel-PT and CoreSight have the same
behaviour for capturing trace data from multiple AUX ring buffers when
snapshot occurs.
I'd like to leave patch 1/3 out, and resend it if we get conclusion.
At the meantime, @Denis, if you have observed any profiling result
(or profiling quality) difference caused by patch 1, the feedback would
be very valuable.
Thanks a lot for Denis' testing and insight review from Suzuki!
Leo
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next prev parent reply other threads:[~2021-06-12 3:29 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-28 16:15 [PATCH v1 0/3] coresight: Fix for snapshot mode Leo Yan
2021-05-28 16:15 ` [PATCH v1 1/3] coresight: etm-perf: Correct buffer syncing for snapshot Leo Yan
2021-06-01 9:53 ` James Clark
2021-06-01 10:35 ` Leo Yan
2021-06-10 14:54 ` James Clark
2021-06-11 13:55 ` James Clark
2021-06-08 21:41 ` Mathieu Poirier
2021-06-09 1:35 ` Leo Yan
2021-06-09 1:39 ` Leo Yan
2021-05-28 16:15 ` [PATCH v1 2/3] coresight: tmc-etr: Use perf_output_handle::head for AUX ring buffer Leo Yan
2021-06-10 15:38 ` Suzuki K Poulose
2021-05-28 16:15 ` [PATCH v1 3/3] perf cs-etm: Remove callback cs_etm_find_snapshot() Leo Yan
2021-06-22 14:29 ` James Clark
2021-06-28 1:31 ` Leo Yan
2021-06-24 16:46 ` James Clark
2021-06-10 6:43 ` [PATCH v1 0/3] coresight: Fix for snapshot mode Denis Nikitin
2021-06-10 16:04 ` Suzuki K Poulose
2021-06-11 8:31 ` Denis Nikitin
2021-06-12 3:27 ` Leo Yan [this message]
2021-06-21 8:21 ` Denis Nikitin
2021-06-22 12:58 ` Leo Yan
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