From nobody Fri Jul 24 21:53:41 2026 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D76F43F5BF3 for ; Thu, 23 Jul 2026 08:36:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784795801; cv=none; b=CAAH03j4ehuTFFY8BtbhoD5F9BkIR4vYYN4/cP7JCTHSzqlTf9QJerJG44tahLid2OUGLGnVZD+FlEuq0H1poNulN/bFj/vGo7YQmaSFQAGv8WG8Lh84hI3UEDnAn1B18+dGYD7frbInwUpq9NYPgqqzA2gcwvToXbPzC62XuUc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784795801; c=relaxed/simple; bh=AVqzeNSUa6gH1oQqhAntxC/c7U1iibuhGcRrF2MTHC0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=KiKNDjeARw5mvFEOY7QaQrJcSSj3QJNadFMg+WO/KoOFLEjzQ7eYUF/7HePh/JWx8tvOsUdg8DcLjaILgpyizqSzrez75zk7Fc00Ec+sXyY1ruIXEOhPIqDMgCQTInLKaCx7B3Ld0pH21LN3BZQEFKqG+F4Gd8G6TM1h1sB7I9E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=Pec4nNg2; arc=none smtp.client-ip=220.197.31.5 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) header.d=163.com header.i=@163.com header.b="Pec4nNg2" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=SB E36N/6eYT51uNDor+MQsb6dFUHe3j7OYN7jOxORqI=; b=Pec4nNg286WKCI3dFR wcG3kgSLoACFxJPS6LwoTg2gSiDxX+r0PV4JdXeCZ/irgmG9MJDIuDP2A9KfJonW x38DwtvhNuFtTJTrXs13eAH/PE+MyzuuGTXBYjFVdfo/erMiWNzfAjKJxRNvizH6 mqshvpIfRrQON8txL61rkRKzg= Received: from localhost.localdomain (unknown []) by gzga-smtp-mtada-g0-2 (Coremail) with SMTP id _____wBXR2pP0mFqaugiLA--.42284S2; Thu, 23 Jul 2026 16:35:30 +0800 (CST) From: Li kunyu To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com Cc: linux-kernel@vger.kernel.org, Li kunyu Subject: [PATCH] kernel/sched/fair: The CPU idle check can be placed before the CPU overload check Date: Thu, 23 Jul 2026 16:35:18 +0800 Message-ID: <20260723083518.117991-1-likunyu10@163.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _____wBXR2pP0mFqaugiLA--.42284S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7WrWrtry5KrWkCryxJw17GFg_yoW8Gr17pr sxKF48Wr48Gw1qq3yYvF4vg3y8Jw1xGayj9rs0kayfJr15Kas0gF95KF1a9FW0yryvvFnI yrySkrWa934UKF7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pi-eOPUUUUU= X-CM-SenderInfo: poln30d1xriqqrwthudrp/xtbC5BK7YGph0lL-VgAA3P Content-Type: text/plain; charset="utf-8" Similarly, the "if (cpu_overutilized(i))" check primarily focuses on checking for CFS task overload, including CPU overheating and wear caused by overload. When the "if (!nr_running && idle_cpu(i))" check is satisfied, overload issues are unlikely to occur. However, DL tasks are not within the scope of these two checks, and their potential impact is not considered. Signed-off-by: Li kunyu --- kernel/sched/fair.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index d78467ec6ee1..00fed021ea22 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -11819,9 +11819,6 @@ static inline void update_sg_lb_stats(struct lb_env= *env, nr_running =3D rq->nr_running; sgs->sum_nr_running +=3D nr_running; =20 - if (cpu_overutilized(i)) - sgs->group_overutilized =3D 1; - #ifdef CONFIG_SCHED_CACHE if (sched_cache_enabled()) { struct sched_domain *sd_tmp; @@ -11849,6 +11846,9 @@ static inline void update_sg_lb_stats(struct lb_env= *env, if (balancing_at_rd && nr_running > 1) *sg_overloaded =3D 1; =20 + if (cpu_overutilized(i)) + sgs->group_overutilized =3D 1; + #ifdef CONFIG_NUMA_BALANCING /* Only fbq_classify_group() uses this to classify NUMA groups */ if (sd_flags & SD_NUMA) { --=20 2.47.3