From nobody Fri Apr 17 06:17:18 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 934F2361DBA; Mon, 23 Feb 2026 10:25:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771842328; cv=none; b=PQdBUYhCx7OoxARpx6bZvPXU8iHxfX2zObQhw/mosCZJs2n9vXdAobAT6AbiOVCbccCdTpNZP3fKsX6tmGFOyjJhvZzhcCbZR6N9DDaWU4mWklrCGqw/YNf5IwGJ6kReeE1RTETpuG30LF3gp0NkQ9bEMvsTWaAWFEL1FH878Yc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771842328; c=relaxed/simple; bh=YQZWnOqgJFFAxbKGwKVHGUdpw22tZqQQtlDHoQHwTtw=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=mAzi+CqMfD2FU2zjFi62JrfyYJTH2S/NpCEdsavcYwBV0I1aeTdaVB2DWTiDGvKZ+AWMOkgm9hdGsVius3rueV/f/gszPkahDKFrTy5ThQ9fXfPQRba2RPgIfm0tWEnhap8OGzuQf5x7/261ABGgWiOLzKnztE54BfTCiPt4+E8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=aIN6AfTD; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=m2jdAHwD; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="aIN6AfTD"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="m2jdAHwD" Date: Mon, 23 Feb 2026 10:25:22 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1771842323; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JaJHZvhKCql9+OxnUa1SXmQE0JmjF8Cesjl9asflD+A=; b=aIN6AfTDORzBqeRkZv8m1zpNz25NXKCYKf2tMf+Hur/UHeExjDB6kbyKLLYsrpGIyDrQ43 hXqqOAUNf6fRyTMiUcaNBqSAYKqIY4h5lpIpOfRG0pfnl2s5jQlKvRlD7/fUorliy0MPpe oombHQ8Sgo4D/TFpymouPz9VQpwFMsVhjCXKrwnub90DGNzhyVIJN7+71Hua5Jt1DoTQr4 0WMIZvg7y/Tnv0w4W5q9Snk80wxL9OXDmXAEwKi3cF6T7Bs2o5RESDZ2df9khUpjo76pXW xynaJ8Ecenh+BrbVpV4eVxNaTC7bJ4J8cAjw4WliIKuEHkfNUy9+jCwnjdzBXQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1771842323; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JaJHZvhKCql9+OxnUa1SXmQE0JmjF8Cesjl9asflD+A=; b=m2jdAHwD1Jec/WpUUxi6JHgHR+at2oKjsjZdqFI/jeR4kmLaZMtYcyquLQ4Q3WrzR+jj6O cHm98Ohk5dvNCXBQ== From: "tip-bot2 for Wang Tao" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: sched/urgent] sched/eevdf: Update se->vprot in reweight_entity() Cc: Zhang Qiao , Wang Tao , "Peter Zijlstra (Intel)" , Vincent Guittot , K Prateek Nayak , Shubhang Kaushik , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20260120123113.3518950-1-wangtao554@huawei.com> References: <20260120123113.3518950-1-wangtao554@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <177184232257.1647592.11476735322518429138.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the sched/urgent branch of tip: Commit-ID: ff38424030f98976150e42ca35f4b00e6ab8fa23 Gitweb: https://git.kernel.org/tip/ff38424030f98976150e42ca35f4b00e6= ab8fa23 Author: Wang Tao AuthorDate: Tue, 20 Jan 2026 12:31:13=20 Committer: Peter Zijlstra CommitterDate: Mon, 23 Feb 2026 11:19:18 +01:00 sched/eevdf: Update se->vprot in reweight_entity() In the EEVDF framework with Run-to-Parity protection, `se->vprot` is an independent variable defining the virtual protection timestamp. When `reweight_entity()` is called (e.g., via nice/renice), it performs the following actions to preserve Lag consistency: 1. Scales `se->vlag` based on the new weight. 2. Calls `place_entity()`, which recalculates `se->vruntime` based on the new weight and scaled lag. However, the current implementation fails to update `se->vprot`, leading to mismatches between the task's actual runtime and its expected duration. Fixes: 63304558ba5d ("sched/eevdf: Curb wakeup-preemption") Suggested-by: Zhang Qiao Signed-off-by: Wang Tao Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Vincent Guittot Tested-by: K Prateek Nayak Tested-by: Shubhang Kaushik Link: https://patch.msgid.link/20260120123113.3518950-1-wangtao554@huawei.c= om --- kernel/sched/fair.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index f2b46c3..93fa5b8 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -3815,6 +3815,8 @@ static void reweight_entity(struct cfs_rq *cfs_rq, st= ruct sched_entity *se, unsigned long weight) { bool curr =3D cfs_rq->curr =3D=3D se; + bool rel_vprot =3D false; + u64 vprot; =20 if (se->on_rq) { /* commit outstanding execution time */ @@ -3822,6 +3824,11 @@ static void reweight_entity(struct cfs_rq *cfs_rq, s= truct sched_entity *se, update_entity_lag(cfs_rq, se); se->deadline -=3D se->vruntime; se->rel_deadline =3D 1; + if (curr && protect_slice(se)) { + vprot =3D se->vprot - se->vruntime; + rel_vprot =3D true; + } + cfs_rq->nr_queued--; if (!curr) __dequeue_entity(cfs_rq, se); @@ -3837,6 +3844,9 @@ static void reweight_entity(struct cfs_rq *cfs_rq, st= ruct sched_entity *se, if (se->rel_deadline) se->deadline =3D div_s64(se->deadline * se->load.weight, weight); =20 + if (rel_vprot) + vprot =3D div_s64(vprot * se->load.weight, weight); + update_load_set(&se->load, weight); =20 do { @@ -3848,6 +3858,8 @@ static void reweight_entity(struct cfs_rq *cfs_rq, st= ruct sched_entity *se, enqueue_load_avg(cfs_rq, se); if (se->on_rq) { place_entity(cfs_rq, se, 0); + if (rel_vprot) + se->vprot =3D se->vruntime + vprot; update_load_add(&cfs_rq->load, se->load.weight); if (!curr) __enqueue_entity(cfs_rq, se);