From nobody Wed Feb 11 05:22:47 2026 Received: from sender-of-o51.zoho.eu (sender-of-o51.zoho.eu [136.143.169.51]) (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 A0988145B1E for ; Sun, 31 Mar 2024 16:02:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.169.51 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711900949; cv=pass; b=RAuAxJWdl+gbeiiTCsHZ5WVSmQZ78ugYRms9WGIikFubJFvv8SD1AEzd2xe9Pkj23QeeMI7JaWTeKbxaxYvzulp65PJyR8fGhAFpbaVHrv00hFAmTBm3qoOPcAil22YG+oDRPT2z8ruAQ35F5ayMWbrGb9GJ/prdgYP0lDg0V/0= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711900949; c=relaxed/simple; bh=7UriqIK5rF+laeCwYFZ6FEfSLpeqjqBoWq+9Dbpj8RE=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=H21a7/GUFQyQCsd4Fjf3HXPHi7LmaQV3nQNMDvI26RHaa34sv79ZzB8CKuA4sfwm1BhqurYfssttwMbnXMZBmEdo/YzEInDFlxvmDYwOYcIIAsrL0TmybhdXioAx2baoIdl2qgf7L57Lfi/jBb1ChSJb5xVJc9Jbhm92g0q+RFg= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=bursov.com; spf=pass smtp.mailfrom=bursov.com; dkim=pass (1024-bit key) header.d=bursov.com header.i=vitaly@bursov.com header.b=cgdXFN2b; arc=pass smtp.client-ip=136.143.169.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=bursov.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bursov.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=bursov.com header.i=vitaly@bursov.com header.b="cgdXFN2b" ARC-Seal: i=1; a=rsa-sha256; t=1711900922; cv=none; d=zohomail.eu; s=zohoarc; b=BtVoi6YDJhPfA0QR3VMk8rTo/NyjF0EHmIVw7hKKEZZmzS0UqS5F/gmcdghvMC5msm5qiBXgtqH56DFJ2Wpjk1zY9KxhHCT4rqqARukhH8oALHrQ3yGHRuC65Q9fn1xSmYiJVoQNj8yu8ZNDImiKfrW/q+9IaDJtl5MyQII3vz8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.eu; s=zohoarc; t=1711900922; h=Content-Transfer-Encoding:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To:Cc; bh=NUqGMZkK65kGj/RodGIbLreaTB54XBuS98+nAYke6Zk=; b=BmSdmxBQrUTW+fiWkkvmJZjM3pukz0uHYBiOAp56Jkl9vNv16lZRY1JZES7Xct8E0eSa1shu7dz0MXs9ePImUMgSXjELRgb2W4pLSly/wZ/I7qfRrjqQbGFCi2aTOUdwW7gqQaqoNaGlRMhJGC255tnJNSWrNWvReCzzseH3mVI= ARC-Authentication-Results: i=1; mx.zohomail.eu; dkim=pass header.i=bursov.com; spf=pass smtp.mailfrom=vitaly@bursov.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1711900922; s=zoho; d=bursov.com; i=vitaly@bursov.com; h=From:From:To:To:Subject:Subject:Date:Date:Message-Id:Message-Id:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Reply-To:Cc; bh=NUqGMZkK65kGj/RodGIbLreaTB54XBuS98+nAYke6Zk=; b=cgdXFN2bdwUwcxvRZPtnRVFPokwYLVYzaFIVaDvcidAtxJJ63Y1hsIeOF1L4+caB mmxT82ikSSl+lZGFyKZVoDIiskbwK3fFAfRYxC2yPhKdAd08EDcF8dPATFdsQs7Cp9z 7U+9WBunfZ3BAMT80UUrmo+vaTx6S9MG5mk8C5XE= Received: from localhost.localdomain (217.20.170.230 [217.20.170.230]) by mx.zoho.eu with SMTPS id 1711900920516823.7166383685085; Sun, 31 Mar 2024 18:02:00 +0200 (CEST) From: Vitalii Bursov To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , linux-kernel@vger.kernel.org, Vitalii Bursov Subject: [PATCH v2 1/3] sched/fair: allow disabling sched_balance_newidle with sched_relax_domain_level Date: Sun, 31 Mar 2024 19:01:47 +0300 Message-Id: X-Mailer: git-send-email 2.39.2 In-Reply-To: References: 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-ZohoMailClient: External Content-Type: text/plain; charset="utf-8" Change relax_domain_level checks so that it would be possible to include or exclude all domains from newidle balancing. This matches the behavior described in the documentation: -1 no request. use system default or follow request of others. 0 no search. 1 search siblings (hyperthreads in a core). "2" enables levels 0 and 1, level_max excludes the last (level_max) level, and level_max+1 includes all levels. Fixes: 9ae7ab20b483 ("sched/topology: Don't set SD_BALANCE_WAKE on cpuset d= omain relax") Signed-off-by: Vitalii Bursov Reviewed-by: Vincent Guittot --- kernel/cgroup/cpuset.c | 2 +- kernel/sched/topology.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 4237c8748..da24187c4 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -2948,7 +2948,7 @@ bool current_cpuset_is_being_rebound(void) static int update_relax_domain_level(struct cpuset *cs, s64 val) { #ifdef CONFIG_SMP - if (val < -1 || val >=3D sched_domain_level_max) + if (val < -1 || val > sched_domain_level_max + 1) return -EINVAL; #endif =20 diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 63aecd2a7..67a777b31 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -1475,7 +1475,7 @@ static void set_domain_attribute(struct sched_domain = *sd, } else request =3D attr->relax_domain_level; =20 - if (sd->level > request) { + if (sd->level >=3D request) { /* Turn off idle balance on this domain: */ sd->flags &=3D ~(SD_BALANCE_WAKE|SD_BALANCE_NEWIDLE); } --=20 2.20.1 From nobody Wed Feb 11 05:22:47 2026 Received: from sender-of-o51.zoho.eu (sender-of-o51.zoho.eu [136.143.169.51]) (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 A0947145B14 for ; Sun, 31 Mar 2024 16:02:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.169.51 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711900949; cv=pass; b=pgLnE6Oh4/cdwtUmbXiG0TEtj2IkFSJ9eHgymftnwm3JWn7bxBn1vXRa32ZNCnazhHFA1KmXEUkHMCCgOShUB5M9BPMYBCMz7BXX0lcsmZissAj+detOD8b+EB8eSZQ2WWtBfRS1BU/+qH+pqHldmZ8JteJgSI359y0Omua9SSY= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711900949; c=relaxed/simple; bh=prLx6gsZJs5Wv0DMByRz8ryTqBfhCeklEU78XQxEff0=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=tCkOzkkP5C4nRD0sdE4svYWxVm38ehB5zfboC6D0po58eL1azhmkzDUdy9h/KwkCrjmLjoelCQT33wWECRzN5yVU4gfas7RsIXDHM/tbktKrM/u/blAauy0ihaLgdbw3bMuleC9LMk2Z3qP0FEcNGKLzBO6yIt6K1HEtmETypv0= ARC-Authentication-Results: i=2; 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charset="utf-8" Knowing domain's level exactly can be useful when setting relax_domain_level or cpuset.sched_relax_domain_level Usage: cat /debug/sched/domains/cpu0/domain1/level to dump cpu0 domain1's level. Signed-off-by: Vitalii Bursov --- kernel/sched/debug.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 8d5d98a58..c1eb9a1af 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -425,6 +425,7 @@ static void register_sd(struct sched_domain *sd, struct= dentry *parent) =20 debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops); debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd= _flags_fops); + debugfs_create_u32("level", 0444, parent, (u32 *)&sd->level); } =20 void update_sched_domain_debugfs(void) --=20 2.20.1 From nobody Wed Feb 11 05:22:47 2026 Received: from sender-of-o51.zoho.eu (sender-of-o51.zoho.eu [136.143.169.51]) (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 D1F8B148FF5 for ; Sun, 31 Mar 2024 16:02:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.169.51 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711900954; cv=pass; b=T9FamtZOJXTiAliY59sR5XIAOa5QNwaXlDWuu99P4JbxXBXrjYAj9H8qXypuMIhVpngBlLvP63xDQGoR2QQE4U2sNXzZiLD/iu3q92EsBadESxU4EyDs6XLn3rEodPFuCi7jSZO5/4ZBoQYHUbq4OqTi544k8Sh9g4OjzemNHoE= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711900954; c=relaxed/simple; bh=avuhYgLWVdEz3QPjIiNeZFxgxLHoyXJgRiOZcBkekdw=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=jtPdSNpfA82MVn2HKdC/11tNo8r3jglt8FZmlKZZZqqjqolLaBi7tuIUdFvLK9P8mhBOjQ2WE50EPT2aj0YFfNMuJzy4H7oU5FwPe5Tc8TygQAezVXsuGMjebmMp7jnTyFCcpVCO55ETn+BLOXxSbgb3sy8u9JGyTIa14F49u+8= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=bursov.com; spf=pass smtp.mailfrom=bursov.com; dkim=pass (1024-bit key) header.d=bursov.com header.i=vitaly@bursov.com header.b=uchmRoTk; arc=pass smtp.client-ip=136.143.169.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=bursov.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bursov.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=bursov.com header.i=vitaly@bursov.com header.b="uchmRoTk" ARC-Seal: i=1; a=rsa-sha256; t=1711900922; cv=none; d=zohomail.eu; s=zohoarc; b=PsvDzgAZjqv/CGOdUo7+sNE76xXHYRqnRVS2yZF/m5tTlKa0ZDz1nEQl4ikI7hvfixnXO3zg13zcp+twDOgw1fpmpbjFhDpz3TcFjFQj/b7EDSfLzj6/Ed7lf7+MnfjRL8BcSWbbizkOrN9Okb5GbN/p7nlXIHVvrI8Xa0Ng7N0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.eu; s=zohoarc; t=1711900922; h=Content-Transfer-Encoding:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To:Cc; bh=dFZ+Th39mFALLRRNFXdhDn/IaGd1DyCaJm+9g0YLcTE=; b=ATRz63owEmLA2j5An83ZBB8Ie2qE+YpTEJZ2rxuyN1RjLM/VIjtyIiSF3jBJIq8GDe49Rl2JKkw1AqAR8Q1asLfuEtIkXeZNdho94piVknOz2rOE2B4GOYMuGjurT6qgeiaFq1kTARwckIOSYTU3JKb7JKQ2MjncYrWlj2ZHc1U= ARC-Authentication-Results: i=1; mx.zohomail.eu; dkim=pass header.i=bursov.com; spf=pass smtp.mailfrom=vitaly@bursov.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1711900922; s=zoho; d=bursov.com; i=vitaly@bursov.com; h=From:From:To:To:Subject:Subject:Date:Date:Message-Id:Message-Id:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Reply-To:Cc; bh=dFZ+Th39mFALLRRNFXdhDn/IaGd1DyCaJm+9g0YLcTE=; b=uchmRoTkP9LYdMA/S+sP/onU+WdnM2ASKLPkH5aCJgTmaiui0CWY7OsjXVPEW52u 8fnogrOj15IRRfNUNX102nsqYKTu35wHyglaQgjiOTgqa5XpA1hvhdaFUqI2jmPCBEz 0YSWeBn3XLNdK3gTa0OfUTvGM9Hs06qk/u2AFKlI= Received: from localhost.localdomain (217.20.170.230 [217.20.170.230]) by mx.zoho.eu with SMTPS id 1711900922174361.44191369435737; Sun, 31 Mar 2024 18:02:02 +0200 (CEST) From: Vitalii Bursov To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , linux-kernel@vger.kernel.org, Vitalii Bursov Subject: [PATCH v2 3/3] docs: cgroup-v1: clarify that domain levels are system-specific Date: Sun, 31 Mar 2024 19:01:49 +0300 Message-Id: X-Mailer: git-send-email 2.39.2 In-Reply-To: References: 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-ZohoMailClient: External Content-Type: text/plain; charset="utf-8" Add a clarification that domain levels are system-specific and where to check for system details. Add CPU clusters to the scheduler domain levels table. Signed-off-by: Vitalii Bursov --- Documentation/admin-guide/cgroup-v1/cpusets.rst | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/Documentation/admin-guide/cgroup-v1/cpusets.rst b/Documentatio= n/admin-guide/cgroup-v1/cpusets.rst index 7d3415eea..d16a3967d 100644 --- a/Documentation/admin-guide/cgroup-v1/cpusets.rst +++ b/Documentation/admin-guide/cgroup-v1/cpusets.rst @@ -568,19 +568,25 @@ on the next tick. For some applications in special s= ituation, waiting =20 The 'cpuset.sched_relax_domain_level' file allows you to request changing this searching range as you like. This file takes int value which -indicates size of searching range in levels ideally as follows, +indicates size of searching range in levels approximately as follows, otherwise initial value -1 that indicates the cpuset has no request. =20 =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D -1 no request. use system default or follow request of others. 0 no search. 1 search siblings (hyperthreads in a core). - 2 search cores in a package. - 3 search cpus in a node [=3D system wide on non-NUMA system] - 4 search nodes in a chunk of node [on NUMA system] - 5 search system wide [on NUMA system] + 2 search cpu clusters + 3 search cores in a package. + 4 search cpus in a node [=3D system wide on non-NUMA system] + 5 search nodes in a chunk of node [on NUMA system] + 6 search system wide [on NUMA system] =3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20 +Not all levels can be present and values can change depending on the +system architecture and kernel configuration. Check +/sys/kernel/debug/sched/domains/cpu*/domain*/ for system-specific +details. + The system default is architecture dependent. The system default can be changed using the relax_domain_level=3D boot parameter. =20 --=20 2.20.1