linux-kernel - Re: [PATCH v5 1/1] events/core: fix failure case for accounting child_total_enable

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Message-ID: <20250327110319.GE604566@e132581.arm.com>
Date: Thu, 27 Mar 2025 11:03:19 +0000
From: Leo Yan <leo.yan@....com>
To: Yeoreum Yun <yeoreum.yun@....com>
Cc: peterz@...radead.org, mingo@...hat.com, mingo@...nel.org,
	acme@...nel.org, namhyung@...nel.org, mark.rutland@....com,
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
	irogers@...gle.com, adrian.hunter@...el.com,
	kan.liang@...ux.intel.com, elver@...gle.com, james.clark@...aro.org,
	suzuki.poulose@....com, mike.leach@....com,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/1] events/core: fix failure case for accounting
 child_total_enable_time at task exit

On Wed, Mar 26, 2025 at 08:20:03AM +0000, Yeoreum Yun wrote:

[...]

> After this patch, this problem is gone like:
> 
> sudo ./perf stat -vvv -e armv8_pmuv3_0/event=0x08/ -e armv8_pmuv3_1/event=0x08/ -- stress-ng --pthread=2 -t 10s
> ...
> armv8_pmuv3_0/event=0x08/: 15396770398 32157963940 21898169000
> armv8_pmuv3_1/event=0x08/: 22428964974 32157963940 10259794940
> 
>  Performance counter stats for 'stress-ng --pthread=2 -t 10s':
> 
>     15,396,770,398      armv8_pmuv3_0/event=0x08/                                               (68.10%)
>     22,428,964,974      armv8_pmuv3_1/event=0x08/                                               (31.90%)
> 
> Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
> Suggested-by: Peter Zijlstra <peterz@...radead.org>
> Fixes: ef54c1a476aef ("perf: Rework perf_event_exit_event()")

Tested-by: Leo Yan <leo.yan@....com>