From nobody Mon Feb 9 01:45:36 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 09FAC1DF759 for ; Fri, 22 Nov 2024 17:36:00 +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=1732296965; cv=none; b=l6Hvt7dsYYQk9MQ8ialnSjAVRMa1LgWyffm1LvT1BTFK69jB4XvCbC247G2oKJ1dPFS7eJUgKeBgJE6m7kr82yy0WdEnFd+k6PX9Q+dLVQs6KeQR2ImhScN0KA16Vc4cOPWkGLc3q7lpKpAYHI/a3xIanBAccdYukNKceP/caf8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732296965; c=relaxed/simple; bh=ru+qPh0+fdD+3UW9gAXU/j1CZeYHpqdK62PLYgcPt5k=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=H+rwhq+QXx0bFD7Ea49HTBldFdugfr0LyZVUEp2xmZFVjRXMpnDYf3bAkGg3MGVTHxgvr9J8S39W53l39AV7oxUm87wH8LcptuCTCzfgutJpm22hZefZm3rYEYO8Nk1rc2C9JEkfjGnO3nePiVaVqixDlLTZI2wSTsEL13BPmlo= 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=QKeBLGEM; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=9TVtjVhh; 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="QKeBLGEM"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="9TVtjVhh" Date: Fri, 22 Nov 2024 18:35:57 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1732296958; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type; bh=g4uvewhN/5RRhM9hjcyM70QtZWjMssi/swMDzE0BVRw=; b=QKeBLGEMjP6TnnXW75toiUe3cbQouwkf6BgPyg3lB33SawM3/A0/Xkfax9FLfcAIDI/0tj B+wjJ8Wux/p0ZL/XrbUJZ8TmcVAojnaxsnxE5tCmpKMrhf8qUczSZKMci0if4JNM+9Tjb6 6GnASzqzY6GWiXn57b3DkWC4HK+hggTZJwfvwQtKYlVTUFLBf/VQ/L9/rTFJiN2IrcLoxL 5klOzT4R6xPSbvMtaAv53bZJEZsYz0AFyJCEnSn2I8nDd1aYqsvsn2r5jKCrTy+uczB0tB +X04vqJDTMvmAQPBK6XBVqcp1bFbPlvsvgrpCuVHffU5DrLJdTmtvwNGMeUWhg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1732296958; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type; bh=g4uvewhN/5RRhM9hjcyM70QtZWjMssi/swMDzE0BVRw=; b=9TVtjVhh6+StipzZIRP1zvt2VFdHfjpvNze3jL14H4p+SSTSqUdTYWbeezjyvab55hveyx qRbmrPjoZOd/j7BQ== From: Sebastian Andrzej Siewior To: Peter Zijlstra , linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, Shrikanth Hegde , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider Subject: [PATCH] sched/core: Update kernel boot parameters for LAZY preempt. Message-ID: <20241122173557.MYOtT95Q@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Shrikanth Hegde --- 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 9cd9cd06538bf..23d9bd5ea7e47 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4818,6 +4818,11 @@ 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 --=20 2.45.2