From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ms.lwn.net (ms.lwn.net [45.79.88.28]) (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 5DFFD392C34; Mon, 31 Aug 2026 21:46:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.79.88.28 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788212765; cv=none; b=Av21uEzB0I1WydvxNHYKfPXUNcazD9KDjpb3ITNNY1CMQm3xQTp1kk0hMJWkjQflViVsCa+Zlbsynk/O7/eFWhd43qMWV5+zkABy4w+eIc2DPu3EsmztAJh+Ckr7mnUJjHphUo/1w53fGhxNi3gFkyFPtUkjzBwsqOACgC4PELU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788212765; c=relaxed/simple; bh=5YBZk6+S6cGK32SKRwAHu3YWtc1M5v22W4q3G9pvIVY=; h=From:To:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=X+i7FCheohQTj5cCEZjJO0JRy/EOpWWkZdxaHiSp3rpH10wf0a+uyHtJv4ibJ4xIDqBIwJn+4oA+dAlby3yrScmgd/hRrDdW0WBZJb9oXgTvWPdJ6CxJx0bQrK1QklNDAK+6YfQxh95rN6oL1f+1dbZyQUqUx6/bd+w2aKx2y5k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lwn.net; spf=pass smtp.mailfrom=lwn.net; dkim=pass (2048-bit key) header.d=lwn.net header.i=@lwn.net header.b=Z52H/c91; arc=none smtp.client-ip=45.79.88.28 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lwn.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lwn.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lwn.net header.i=@lwn.net header.b="Z52H/c91" DKIM-Filter: OpenDKIM Filter v2.11.0 ms.lwn.net 9ED65408DB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lwn.net; s=20201203; t=1788212763; bh=EFGqfU9HkeIt9fcjWEdtnOhdwdCof1fhGIvVt3dD1GY=; h=From:To:Subject:In-Reply-To:References:Date:From; b=Z52H/c91Ib4UMjys/xRwrXd3qeLHRC0zf/KhkeQaiKWpNot068TIzCS5PV07d5Mvo vlmDMyRiuvh7Q4mGkgaPG7bLroa6SFpb+Qdxm6GQ2uJEzYu4YbELkfr+dz5v9SH2+5 3r1eMkR0/zix7ZRIu3s3tjry/9JOgkpIJMdSuE+HhUnwBf/p6IAVP+NumASVOfIcuv Os6RuSUPWMvMz5ZErokPIvFVAACfHP+8oP9d4J3AJwQyx5BJEuZMdH+k9sVupDnouR ENUf5WRIJbg2Ql84ALO3YXD6q4J28eMaQJ9VycJ3NwDr1CGmjCroTy/zsOxRAgBup8 MIJtoqDOKPkhw== Received: from localhost (unknown [IPv6:2601:280:4600:814::1fe]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by ms.lwn.net (Postfix) with ESMTPSA id 9ED65408DB; Mon, 31 Aug 2026 21:46:03 +0000 (UTC) From: Jonathan Corbet To: Costa Shulyupin , Shuah Khan , Randy Dunlap , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v1] docs: sysctl: timer_migration is for hrtimer only In-Reply-To: <20260826132921.294142-1-costa.shul@redhat.com> References: <20260826132921.294142-1-costa.shul@redhat.com> Date: Mon, 31 Aug 2026 15:46:02 -0600 Message-ID: <87se3uezfp.fsf@trenco.lwn.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Costa Shulyupin writes: > Since commit b2cf7507e1864 ("timers: Always queue timers on the local > CPU") __mod_timer() no longer depends on timers_migration_enabled. Only > high-resolution timer migration from isolated to housekeeping CPUs > depends on it. > > Update and clarify the documentation accordingly. > > Signed-off-by: Costa Shulyupin > --- > Documentation/admin-guide/sysctl/kernel.rst | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst > index b6328cd0f43e..fb38d654846d 100644 > --- a/Documentation/admin-guide/sysctl/kernel.rst > +++ b/Documentation/admin-guide/sysctl/kernel.rst > @@ -1609,8 +1609,10 @@ If a value outside of this range is written to ``threads-max`` an > timer_migration > =============== > > -When set to a non-zero value, attempt to migrate timers away from idle cpus to > -allow them to remain in low power states longer. > +When set to a non-zero value, attempt to migrate high-resolution timers from > +nohz isolated (nohz_full) to housekeeping CPUs. > +See Documentation/admin-guide/cpu-isolation.rst > +and Documentation/admin-guide/kernel-parameters.rst. Applied, thanks. jon