From: Leo Yan <leo.yan@arm.com>
To: James Clark <james.clark@linaro.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@arm.com>,
John Garry <john.g.garry@oracle.com>,
Will Deacon <will@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
Suyash Mahar <smahar@meta.com>, Amir Ayupov <aaupov@fb.com>,
Leo Yan <leo.yan@linux.dev>,
linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
linux-doc@vger.kernel.org
Subject: Re: [PATCH v2 05/14] perf cs-etm: Increase default timestamp generation period
Date: Thu, 27 Aug 2026 15:27:14 +0100 [thread overview]
Message-ID: <20260827142714.GM8904@e132581.arm.com> (raw)
In-Reply-To: <20260821-james-cs-unformatted-per-thread-fix-v2-5-00c4fd0701b4@linaro.org>
On Fri, Aug 21, 2026 at 10:49:03AM +0100, James Clark wrote:
> The original purpose of timestamps in per-CPU mode was to roughly emit
> samples in the order they occurred across multiple CPUs, rather than
> emit all the trace from CPU 1 followed by all from CPU 2 etc.
> Previously there was no way to change the interval from the minimum of 1
> cycle, but custom intervals are now supported by the driver.
>
> Drastically reduce the number of timestamps emitted by increasing the
> interval, which is more than enough to interleave sample generation.
> This reduces the size of the trace generated.
>
> Signed-off-by: James Clark <james.clark@linaro.org>
Reviewed-by: Leo Yan <leo.yan@arm.com>
next prev parent reply other threads:[~2026-08-27 14:27 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-21 9:48 [PATCH v2 00/14] perf cs-etm: Per-thread mode fixes and snapshot wrap support James Clark
2026-08-21 9:48 ` [PATCH v2 01/14] perf cs-etm: Fix nVHE per-thread decoding James Clark
2026-08-26 15:01 ` Leo Yan
2026-08-21 9:49 ` [PATCH v2 02/14] perf cs-etm: Warn for invalid timestamp option James Clark
2026-08-26 15:04 ` Leo Yan
2026-08-21 9:49 ` [PATCH v2 03/14] perf cs-etm: Turn on context packet timestamps in per-thread mode James Clark
2026-08-26 15:36 ` Leo Yan
2026-08-21 9:49 ` [PATCH v2 04/14] perf cs-etm: Use per-CPU queues for " James Clark
2026-08-26 19:06 ` Leo Yan
2026-08-21 9:49 ` [PATCH v2 05/14] perf cs-etm: Increase default timestamp generation period James Clark
2026-08-27 14:27 ` Leo Yan [this message]
2026-08-21 9:49 ` [PATCH v2 06/14] perf auxtrace: Turn Intel BTS snapshot search into a generic one James Clark
2026-08-21 9:49 ` [PATCH v2 07/14] perf arm-spe: Use generic snapshot search James Clark
2026-08-27 16:16 ` Leo Yan
2026-08-21 9:49 ` [PATCH v2 08/14] perf auxtrace: intel-pt: Use new snapshot_has_wrapped callback James Clark
2026-08-21 9:49 ` [PATCH v2 09/14] perf cs-etm: Queue partial AUX records James Clark
2026-08-27 17:09 ` Leo Yan
2026-08-21 9:49 ` [PATCH v2 10/14] perf cs-etm: Don't print missing buffers in snapshot mode James Clark
2026-08-27 17:15 ` Leo Yan
2026-08-21 9:49 ` [PATCH v2 11/14] perf auxtrace: cs-etm: Capture wrapped snapshots James Clark
2026-08-24 12:21 ` Adrian Hunter
2026-08-24 14:32 ` James Clark
2026-08-27 18:21 ` Leo Yan
2026-08-21 9:49 ` [PATCH v2 12/14] perf test: Allow infinite named_thread loops James Clark
2026-08-21 9:49 ` [PATCH v2 13/14] perf test: Add test for per-thread mode James Clark
2026-08-21 9:49 ` [PATCH v2 14/14] perf cs-etm: Test multiple per-thread threads James Clark
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