linux-kernel - Re: [PATCH v3] perf bpf_counter: Fix opening of "any"(-1) CPU events

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Message-ID: <aO5Y1PSs_KOuuy32@google.com>
Date: Tue, 14 Oct 2025 23:06:12 +0900
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>,
	Tengda Wu <wutengda@...weicloud.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] perf bpf_counter: Fix opening of "any"(-1) CPU events

On Thu, Oct 09, 2025 at 06:29:11AM -0700, Ian Rogers wrote:
> The bperf BPF counter code doesn't handle "any"(-1) CPU events, always
> wanting to aggregate a count against a CPU, which avoids the need for
> atomics so let's not change that. Force evsels used for BPF counters
> to require a CPU when not in system-wide mode so that the "any"(-1)
> value isn't used during map propagation and evsel's CPU map matches
> that of the PMU.
> 
> Fixes: b91917c0c6fa ("perf bpf_counter: Fix handling of cpumap fixing hybrid")
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Applied to perf-tools-next, thanks!

Best regards,
Namhyung