linux-kernel - Re: [PATCH v2] perf lock contention: Account contending locks too

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Date: Fri,  1 Mar 2024 11:30:21 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
	bpf@...r.kernel.org,
	Song Liu <song@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...nel.org>,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2] perf lock contention: Account contending locks too

On Tue, 27 Feb 2024 21:33:35 -0800, Namhyung Kim wrote:
> Currently it accounts the contention using delta between timestamps in
> lock:contention_begin and lock:contention_end tracepoints.  But it means
> the lock should see the both events during the monitoring period.
> 
> Actually there are 4 cases that happen with the monitoring:
> 
>                 monitoring period
>             /                       \
>             |                       |
>  1:  B------+-----------------------+--------E
>  2:    B----+-------------E         |
>  3:         |           B-----------+----E
>  4:         |     B-------------E   |
>             |                       |
>             t0                      t1
> 
> [...]

Applied to perf-tools-next, thanks!

Best regards,
-- 
Namhyung Kim <namhyung@...nel.org>