From nobody Sun Feb 8 17:41:34 2026 Received: from m16.mail.126.com (m16.mail.126.com [117.135.210.8]) (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 F087B2FE58F for ; Thu, 13 Nov 2025 12:54:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763038494; cv=none; b=FXC2d90RD20/QfkbHKSIgkhL2fhX5DYYs3HkBwed1utKAeToS5MX2gTrUhdBJ3Q9faCycvn4rxDBOYKiy4ukeb6SrmoxvfFJ8sCIegYX8FfJO+IDNk3LMXQ2AtfcNTU0u9vARIOjRHI0Vo92noyjBCsev22WSa1HAX8uS2Nwvp0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763038494; c=relaxed/simple; bh=inMuMW2OtqRUfQ7VZG+edIgj9nDRzVyBr+EwN2nBIrs=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=prLWCCuMvGAHMYHDc7Vv2qgE7LqpCgtIgcLHMGIsayQRi1n7G0mY/zoCsmwwC6aaVN08IMJOEVwbNL9mETozDhv9nTbF1ny48VlyF00vqC7qfrxFSVbnhh/5MmjBilKHJiG9wVkmxa5nleESSaNRlm3UaZBACXx1A9jXZ05QSAc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=126.com; spf=pass smtp.mailfrom=126.com; dkim=pass (1024-bit key) header.d=126.com header.i=@126.com header.b=OU/cg4z0; arc=none smtp.client-ip=117.135.210.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=126.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=126.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=126.com header.i=@126.com header.b="OU/cg4z0" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=126.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=ra Fevk6H2Bk/ffRHdozuP35Zfc9D2yMlTPJd1mpdixc=; b=OU/cg4z0ZeD7I4wjiY e0fQTLA5vL7zFLBFEZnvRs0c0nc+/Vdf/o2pgpnOzr0yfBlzC7AICZoIPYVtJWH2 CQBt6/bEj+FI/be53lkhkw1lcoIzu25FKXYm5cXdvxCcSQWqVN1JbKJXLDJP61fV XY5rrsTRRnl21vOPlX0MXoX+c= Received: from localhost.localdomain (unknown []) by gzsmtp4 (Coremail) with SMTP id PykvCgCnT8Fv0hVpD537BQ--.46139S2; Thu, 13 Nov 2025 20:43:28 +0800 (CST) From: Honglei Wang 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 Cc: linux-kernel@vger.kernel.org Subject: [PATCH] sched/stats: correct the wait_start calculation logic Date: Thu, 13 Nov 2025 20:43:26 +0800 Message-Id: <20251113124326.27588-1-jameshongleiwang@126.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) 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: PykvCgCnT8Fv0hVpD537BQ--.46139S2 X-Coremail-Antispam: 1Uf129KBjvdXoWruFWDtFy5Gw47try5CF4Durg_yoWfGrb_ta yYvF1jkryUKrZxtFyrWw4xX3sYyw4DtF1DAa4DAF4UAFy5Jr98Jas8WF15XrnFgrsagF9r GrsxXFWkKFnFvjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IUUBMNUUUUUU== X-CM-SenderInfo: 5mdpv2pkrqwzphlzt0bj6rjloofrz/1tbirxgFrWkV0akMfwAAso Content-Type: text/plain; charset="utf-8" It's not necessary to do the delta-related subtraction if the task is not on rq migrating. Add the migrating related judgment back. Signed-off-by: Honglei Wang --- kernel/sched/stats.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/sched/stats.c b/kernel/sched/stats.c index d1c9429a4ac5..60560fb31e63 100644 --- a/kernel/sched/stats.c +++ b/kernel/sched/stats.c @@ -12,7 +12,8 @@ void __update_stats_wait_start(struct rq *rq, struct task= _struct *p, wait_start =3D rq_clock(rq); prev_wait_start =3D schedstat_val(stats->wait_start); =20 - if (p && likely(wait_start > prev_wait_start)) + if (p && task_on_rq_migrating(p) && + likely(wait_start > prev_wait_start)) wait_start -=3D prev_wait_start; =20 __schedstat_set(stats->wait_start, wait_start); --=20 2.33.0