From nobody Sun Feb 8 05:59:45 2026 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) (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 2BA012BEC4A for ; Thu, 8 Jan 2026 03:13:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=60.244.123.138 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767842006; cv=none; b=GSNHg4ocwFrtMGS+IV8j4cWKaDCUoWehjuJTHKJYCoqld8fYQCXgZIGGKcHLWD12Htx1VhJA90tGHmw6JVNLALa6Z8puzEVMXidkKlZPKVYD+5SjGptRsKIDFGryv6Y59XX7TLZSoLxZP5Pd4RHWDGs5uLW3jMOxwX1qMoAcq/U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767842006; c=relaxed/simple; bh=pfGoZyJxgO4QTf+WhF942nD9I1yVOXdaCD0GU2lhOJQ=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=OOyIlniSabdTAW4N4BeQfCGAVuKGZUybmHqzCMbI5pUatbVGkKAbm1toRcdiTru8R0vGUMEGUblUWAQ7DCIdamskqimI21VSSE0YXrL4xwagFKdU6Qj/naywzXpGw+SxeqB5kyP1Ofi8jm6WZ19PxsAKA0VbRaepLrcx34a/2xA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=N7oLt+zL; arc=none smtp.client-ip=60.244.123.138 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="N7oLt+zL" X-UUID: f98e7a66ec3f11f0942a039f3f28ce95-20260108 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=6pxfiPpStKTinNfI3yLuxNFmLirLijh17vubfs0MnKI=; b=N7oLt+zLYi0RJ7WZB/tpdu2rN9lcziTFqMkz0jsuz1UICNQeSgrf+gIAYfvG23GqFhKtooXZbgZsqtgu6J4Xd7iWLSTRx3TPmcWs0P6Tt2TPADMI99/vRY+LolYnaEqzYXrqoCiNHAJbWYEq0rZ7JrmvTsqJU8j7M71vyNHIA5M=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.9,REQID:49532ae9-8480-42d5-b3ab-2f534a5e445e,IP:0,UR L:0,TC:0,Content:0,EDM:0,RT:1,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION:r elease,TS:1 X-CID-META: VersionHash:5047765,CLOUDID:ea268a79-8c8a-4fc4-88c0-3556e7711556,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102|836|888|898,TC:-5,Content:0|15|5 0,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OS A:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: f98e7a66ec3f11f0942a039f3f28ce95-20260108 Received: from mtkmbs09n1.mediatek.inc [(172.21.101.35)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1986375853; Thu, 08 Jan 2026 11:13:16 +0800 Received: from mtkmbs13n1.mediatek.inc (172.21.101.193) by mtkmbs11n1.mediatek.inc (172.21.101.185) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Thu, 8 Jan 2026 11:13:14 +0800 Received: from gcnsap21.gcn.mediatek.inc (10.17.81.22) by mtkmbs13n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.2562.29 via Frontend Transport; Thu, 8 Jan 2026 11:13:14 +0800 From: Dengjun Su To: CC: , , , , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Matthias Brugger , AngeloGioacchino Del Regno , , Subject: [PATCH] sched/rt: fix incorrect schedstats for rt thread Date: Thu, 8 Jan 2026 11:13:07 +0800 Message-ID: <20260108031309.2754003-1-dengjun.su@mediatek.com> X-Mailer: git-send-email 2.43.0 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-MTK: N Content-Type: text/plain; charset="utf-8" For RT thread, only 'set_next_task_rt' will call 'update_stats_wait_end_rt' to update schedstats information. However, during the RT migration process, 'update_stats_wait_start_rt' will be called twice, which will cause the values of wait_max and wait_sum to be incorrect. The specific output as follows: $ cat /proc/6046/task/6046/sched | grep wait wait_start : 0.000000 wait_max : 496717.080029 wait_sum : 7921540.776553 Add 'update_stats_wait_end_rt' in 'update_stats_dequeue_rt' to update schedstats information when dequeue_task. Signed-off-by: Dengjun Su --- kernel/sched/rt.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index f1867fe8e5c5..12f2efddca9f 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1302,13 +1302,18 @@ update_stats_dequeue_rt(struct rt_rq *rt_rq, struct= sched_rt_entity *rt_se, int flags) { struct task_struct *p =3D NULL; + struct rq *rq =3D rq_of_rt_rq(rt_rq); =20 if (!schedstat_enabled()) return; =20 - if (rt_entity_is_task(rt_se)) + if (rt_entity_is_task(rt_se)) { p =3D rt_task_of(rt_se); =20 + if (p !=3D rq->curr) + update_stats_wait_end_rt(rt_rq, rt_se); + } + if ((flags & DEQUEUE_SLEEP) && p) { unsigned int state; =20 --=20 2.43.0