linux-kernel - Re: [PATCH v5 1/3] perf stat: Read tool events last

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Message-ID: <aR4IneHUTlFuyRhe@google.com>
Date: Wed, 19 Nov 2025 10:12:45 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
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@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Yang Li <yang.lee@...ux.alibaba.com>,
	James Clark <james.clark@...aro.org>,
	Thomas Falcon <thomas.falcon@...el.com>,
	Thomas Richter <tmricht@...ux.ibm.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>,
	Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: Re: [PATCH v5 1/3] perf stat: Read tool events last

On Tue, Nov 18, 2025 at 01:13:24PM -0800, Ian Rogers wrote:
> When reading a metric like memory bandwidth on multiple sockets, the
> additional sockets will be on CPUS > 0. Because of the affinity
> reading, the counters are read on CPU 0 along with the time, then the
> later sockets are read. This can lead to the later sockets having a
> bandwidth larger than is possible for the period of time. To avoid
> this move the reading of tool events to occur after all other events
> are read.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Applied this one to perf-tools-next first, thanks!

Best regards,
Namhyung