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From: Hui Su <sh_def@163.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
	Valentin Schneider <vschneid@redhat.com>,
	K Prateek Nayak <kprateek.nayak@amd.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sched/pelt: Fix truncation of the PELT period count
Date: Thu, 22 Oct 2026 18:37:31 +0900	[thread overview]
Message-ID: <20261022183731.03184d336c48-2-sh_def@163.com> (raw)
In-Reply-To: <CAKfTPtDQbNgC=gEe87v5kMnz_pB2AEU+ihp2PM5izno6pkNeZA@mail.gmail.com>

On Thu, Oct 22, 2026, Vincent Guittot wrote:

> Did you face this problem, or did you find it only during a code review?

I found it during code review, not from a production failure.

I reproduced it with a KUnit test that advances PELT by exactly 2^32 periods.
Before the fix, util_avg remained 43 instead of 1024; after the fix, the test
passed. A standalone harness confirmed the same result.

Thanks for the review.

Thanks,
Hui


  reply	other threads:[~2026-10-22 10:30 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-22  3:49 Hui Su
2026-10-22  8:34 ` K Prateek Nayak
2026-10-22  8:39   ` Vincent Guittot
2026-10-22  9:37   ` Hui Su
2026-10-22  8:37 ` Vincent Guittot
2026-10-22  9:37   ` Hui Su [this message]
2026-10-22 14:27 ` Kayra Cizmeci

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