From nobody Sun Feb 8 09:27:07 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 AD8EB20897E; Mon, 2 Dec 2024 11:14:49 +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=1733138091; cv=none; b=LOJmGlvNjjUSs5/vdSTEwLFu8DZOkBnNvZsntX1Qft1uvZTa9pjlVE/mqtPTPeridy3h27Nth9jDNbknKKj8ymUzxTpcxLtz+pihCGBSTlLx2wDr0otRqOYTL+H8CmZW+dNHLXKOBh7/q8zlKCJvRveZvumxecitB/SmM4IZdKE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733138091; c=relaxed/simple; bh=ADP+Op/2sDIC+Sq51CifTqfRCa4ABhRCOJH80YTdZys=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=oIHfSJvhJ+ZqKpoIz9daCtDmKkWDqbjS7cXJk2onaDnqecM6vM5ljZ9Rnp/nJliYooVHXTXh7fOlM5+7vgPeuA6nwhDH4QSAV2G10thEereWWZdx/BniaVIA8ru6KWLPVz5hLsUyNRhHe+s/FET2N/HKpz1Wa9nwGU1H91TayOQ= 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=2lWPyglh; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=WCmRHRL3; 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="2lWPyglh"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="WCmRHRL3" Date: Mon, 02 Dec 2024 11:14:47 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1733138088; 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=XSxss/MTd3EUUDl49RIxuV17IF2K3lVlXhUxg5+FocU=; b=2lWPyglhLAxSmfXSsBKs3Db2DsYcdmQZnlP1Kg71R+aXiqtIS5UrZXgBWysVWP5ioeUd1R X/4E5koY+PC/N0Etsk7RRCb4yxnEzLYM6pc49AaPA6Sb2whJNfoxMsovH+/oy/rN9IbqRL GSoLnU5h1Dhlr82jJUymeSgkaLCWvY28B7s1yP0DNKE42oeYZavUnkcaMIILXFc+bDJnI+ h1pGaNI9BOEisK0JjIQ4SLAwDycKsUvG2kdZlX6tvMuIZHgFchkbk5yoSH5tsZj6oMxg7l wUoThkoz5MfmvI+rg55isOr51QtV/r8LFq6UnG5rKSWNGiSwfZNZRDDF3E1SGA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1733138088; 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=XSxss/MTd3EUUDl49RIxuV17IF2K3lVlXhUxg5+FocU=; b=WCmRHRL3qoZK53yViDrKdOVm7c8dMOAPxRtximNqTdIJZcSliZaylhrxJtOfkpcBU8n2du 90GXPKmLdARv2UAQ== From: "tip-bot2 for Sebastian Andrzej Siewior" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: sched/core] sched/core: Update kernel boot parameters for LAZY preempt. Cc: Shrikanth Hegde , Sebastian Andrzej Siewior , "Peter Zijlstra (Intel)" , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20241122173557.MYOtT95Q@linutronix.de> References: <20241122173557.MYOtT95Q@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <173313808754.412.8236870383786854735.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/core branch of tip: Commit-ID: f66e4a996582d59b6f5ce88078b0ad2a328aa532 Gitweb: https://git.kernel.org/tip/f66e4a996582d59b6f5ce88078b0ad2a3= 28aa532 Author: Sebastian Andrzej Siewior AuthorDate: Fri, 22 Nov 2024 18:35:57 +01:00 Committer: Peter Zijlstra CommitterDate: Mon, 02 Dec 2024 12:01:28 +01:00 sched/core: Update kernel boot parameters for LAZY preempt. Update the documentation for the `preempt=3D' parameter which now also accepts `lazy'. Fixes: 7c70cb94d29cd ("sched: Add Lazy preemption model") Reported-by: Shrikanth Hegde Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Shrikanth Hegde Link: https://lore.kernel.org/r/20241122173557.MYOtT95Q@linutronix.de --- Documentation/admin-guide/kernel-parameters.txt | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentatio= n/admin-guide/kernel-parameters.txt index dc663c0..3872bc6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4822,6 +4822,11 @@ can be preempted anytime. Tasks will also yield contended spinlocks (if the critical section isn't explicitly preempt disabled beyond the lock itself). + lazy - Scheduler controlled. Similar to full but instead + of preempting the task immediately, the task gets + one HZ tick time to yield itself before the + preemption will be forced. One preemption is when the + task returns to user space. =20 print-fatal-signals=3D [KNL] debug: print fatal signals