From: Leo Yan <leo.yan@linaro.org>
To: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Arnaldo Carvalho de Melo <acme@kernel.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>,
Mark Rutland <mark.rutland@arm.com>, Jiri Olsa <jolsa@redhat.com>,
Namhyung Kim <namhyung@kernel.org>,
Daniel Kiss <Daniel.Kiss@arm.com>,
Denis Nikitin <denik@chromium.org>,
Coresight ML <coresight@lists.linaro.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v1 3/7] perf cs-etm: Calculate per CPU metadata array size
Date: Sat, 16 Jan 2021 08:50:46 +0800 [thread overview]
Message-ID: <20210116005046.GB5418@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <20210115224658.GC375055@xps15>
Hi Mathieu,
On Fri, Jan 15, 2021 at 03:46:58PM -0700, Mathieu Poirier wrote:
> On Mon, Jan 11, 2021 at 12:09:12PM +0000, Mike Leach wrote:
> > Hi Leo,
> >
> > I think there is an issue here in that your modification assumes that
> > all cpus in the system are of the same ETM type. The original routine
> > allowed for differing ETM types, thus differing cpu ETM field lengths
> > between ETMv4 / ETMv3, the field size was used after the relevant
> > magic number for the cpu ETM was read.
> >
> > You have replaced two different sizes - with a single calculated size.
>
> I usually go through an entire patchset before looking at the comments people
> have made. In this case Mike and I are coming to the exact same conclusion.
Agreed, now this work depends on Mike's patch for extending metadata
version; otherwise if without Mike's patch, it will cause compability
issue.
> I will look at Mike's patch on Monday.
Cool!
Thanks for review,
Leo
next prev parent reply other threads:[~2021-01-16 0:52 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-09 7:44 [PATCH v1 0/7] coresight: etm-perf: Fix pid tracing with VHE Leo Yan
2021-01-09 7:44 ` [PATCH v1 1/7] coresight: etm-perf: Add support for PID tracing for kernel at EL2 Leo Yan
2021-01-11 16:22 ` Mike Leach
2021-01-12 7:22 ` Leo Yan
2021-01-12 8:58 ` Leo Yan
2021-01-12 11:03 ` Suzuki K Poulose
2021-01-12 11:23 ` Mike Leach
2021-01-12 14:14 ` Leo Yan
2021-01-12 23:43 ` Mike Leach
2021-01-15 22:30 ` Mathieu Poirier
2021-01-19 7:05 ` Suzuki K Poulose
2021-01-09 7:44 ` [PATCH v1 2/7] perf cs_etm: Use pid tracing explicitly instead of contextid Leo Yan
2021-01-15 22:44 ` Mathieu Poirier
2021-01-19 2:32 ` Leo Yan
2021-01-09 7:44 ` [PATCH v1 3/7] perf cs-etm: Calculate per CPU metadata array size Leo Yan
2021-01-11 7:28 ` Suzuki K Poulose
2021-01-11 12:09 ` Mike Leach
2021-01-11 15:06 ` Leo Yan
2021-01-13 0:00 ` Mike Leach
2021-01-13 2:27 ` Leo Yan
2021-01-15 22:46 ` Mathieu Poirier
2021-01-16 0:50 ` Leo Yan [this message]
2021-01-09 7:44 ` [PATCH v1 4/7] perf cs-etm: Add PID format into metadata Leo Yan
2021-01-11 9:45 ` Suzuki K Poulose
2021-01-11 13:12 ` Leo Yan
2021-01-09 7:44 ` [PATCH v1 5/7] perf cs-etm: Fixup PID_FMT when it is zero Leo Yan
2021-01-11 9:47 ` Suzuki K Poulose
2021-01-09 7:44 ` [PATCH v1 6/7] perf cs-etm: Add helper cs_etm__get_pid_fmt() Leo Yan
2021-01-11 9:55 ` Suzuki K Poulose
2021-01-09 7:44 ` [PATCH v1 7/7] perf cs-etm: Detect pid in VMID for kernel running at EL2 Leo Yan
2021-01-11 10:07 ` Suzuki K Poulose
2021-01-11 13:10 ` Leo Yan
2021-01-11 18:16 ` [PATCH v1 0/7] coresight: etm-perf: Fix pid tracing with VHE Mathieu Poirier
2021-01-12 7:23 ` Leo Yan
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