From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=220.197.31.4 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792665044; b=Rj5ArDV4j74nJV50cA0nzB3aN7BO7UmB91BLS6uUmZVymyRvpUdPzvaUolAXRSrWZyun UfUijQyP6ZNmH5y+mP3EhiGjctxip3v+LWls3342PCroFjWyO0v5MQkvslVK5r86R7T8b aTZH1uvYwX8vsEZqYdKDmayXGSBAPH/uLghJBRh3SXKtF1AycuV/ZJfCd9pYm7/T255VQ BlxTUXxsM1qLpYKOqr+gNTh780Kjy/zaxYu2WZcuzIrMVRGiOx0Ll43GXXbZ1MsmlVsc4 SCcQKK9TitfMW6jCW97X1r488Tm9zf0lls7zXt4FV1AywcvBk3kFldaebQmHiI91C0w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792665044; h=DMARC-Filter:DKIM-Signature:Received:From:To:Cc:Subject:In-Reply-To: References:Date:Message-ID:MIME-Version:Content-Type: Content-Transfer-Encoding:X-CM-TRANSID:X-Coremail-Antispam: X-CM-SenderInfo; bh=Fumisp5vEG1ryYjSSDkSp8Pk1yUKnUIHvB2FA3w89W0=; b=ApggIlMDd/ig2V84p88yuAfz2WJTZPdgcOSv5EcrOha7i+RAiqzJcoEuVYNA0w+pgnW7 Bd9oqXtlFBwl+dD7E6I0IYOUrDfBZQt1yn+hBMli8/t9Ut2TO94CDJU0EZRXUtjAMz/4K /nLE7dBr3N2nd/XaBd4qLHuLZtcL+wNgsfqTA5yLxv3k1V4AmdUBLULhxVr2lyCTNpLqZ TqxWaznKRBiHaPboxtYsICQBQQVXRChg/vbeegJM3PDTEW/37G6jrfu4bjgGeMMYlnOXp BblwqOzxsa5YLzCdW648D4StaZLifYICDy03N6uw8ysYrHMp5kKMI+5JOcwvZeFlnFw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass header.d=163.com header.i=@163.com header.a=rsa-sha256 header.s=s110527 header.b=UkphuVyC; arc=none smtp.remote-ip=220.197.31.4 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 63175606A31B for ; Thu, 22 Oct 2026 10:30:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 63175606A31B Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256 header.s=s110527 header.b=UkphuVyC DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; bh=Fumisp5vEG1ryYjSSDkSp8Pk1yUKnUIHvB2FA3w89W0=; b=UkphuVyCb8PzCZyAB4JfDbi9XYRoOuTlAO12yPt/In/cba1+Znl0hGxB9ORbEt lmHGJoTYUzzxXegRGfiFGJJ4gNLIkMYayriOb6U1D/TlTabZlTM7unmM9rgsyYix ovl4sQXkTFGaKv2aEFO1rDmfnFFFl0PBJy7DPkULRZgY0= Received: from localhost (unknown []) by gzga-smtp-mtada-g0-4 (Coremail) with SMTP id _____wD33zCM5dlqHTJkCA--.42129S2; Thu, 22 Oct 2026 18:29:33 +0800 (CST) From: Hui Su To: Vincent Guittot Cc: Ingo Molnar , Peter Zijlstra , Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , linux-kernel@vger.kernel.org Subject: Re: [PATCH] sched/pelt: Fix truncation of the PELT period count In-Reply-To: References: <20261022034930.225042-1-sh_def@163.com> Date: Thu, 22 Oct 2026 18:37:31 +0900 Message-ID: <20261022183731.03184d336c48-2-sh_def@163.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wD33zCM5dlqHTJkCA--.42129S2 X-Coremail-Antispam: 1Uf129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7v73 VFW2AGmfu7bjvjm3AaLaJ3UbIYCTnIWIevJa73UjIFyTuYvjxUO1v3DUUUU X-CM-SenderInfo: xvkbvvri6rljoofrz/xtbC6Q6tDWrZ5Y74ogAA3F 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