From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 2F847358378; Fri, 4 Sep 2026 06:20:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788502857; cv=none; b=i2D2uNZFI2Qb7CPh3Wd+soOqysobgPdDDWmEnSpzBcPfmGLT8mucikXJ3lFvu2OzzBjRRfj086i2gDHGXvGU4VNNBlHlDdrLO9nUyhIsS7c4mOFmSFr5S9N+eEfbdcSJCPnrk+OV1gOgac4uks5VCUW62EvfAleDGgdoJVSMzVI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788502857; c=relaxed/simple; bh=OfT3XxWYJYsLyekUE8AYRGRGg/tCiDb56aMjQq9HR74=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=O90GUS3kzVgz/TjiugMju2bldU/immtqK4xAWUsX6MxxihLFAmJ0DVcsWavE+ODKLZs++jHM6CfnOZq/7h32UDH/Pzv4hE4FTSIUe4+tQw3fUkoKIViY34MpnCO5SoIq+64QVghzTHWCgwOL5Gnn9kWr5MEHyd9tPWE10EapVf4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: c1f55886a82811f19a56ed5b684f684d-20260904 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NO_NAME, HR_CTE_8B, HR_CTT_MISS HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_DIGIT_LEN, HR_FROM_NAME HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT HR_TO_NO_NAME, IP_TRUSTED, SRC_TRUSTED, DN_TRUSTED, SA_EXISTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_GOOD CIE_GOOD_SPF, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU, AMN_GOOD ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.19,REQID:9d7a1e0c-694a-456e-9df9-882ad9aeb903,IP:10, URL:0,TC:0,Content:-5,EDM:25,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:30 X-CID-INFO: VERSION:1.3.19,REQID:9d7a1e0c-694a-456e-9df9-882ad9aeb903,IP:10,UR L:0,TC:0,Content:-5,EDM:25,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:30 X-CID-META: VersionHash:7db8b62,CLOUDID:762f98f57e8331037737a825e3a18d9a,BulkI D:260904140159BPD4Y87M,BulkQuantity:2,SF:17|19|66|78|81|82|102|127|136|850 |865|898,TC:nil,Content:0|15|50|99,EDM:5|-100,IP:-2,URL:0,File:nil,RT:nil, Bulk:40,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR :0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: c1f55886a82811f19a56ed5b684f684d-20260904 X-User: liuzhe1@kylinos.cn Received: from localhost.localdomain [(223.70.159.239)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 217919923; Fri, 04 Sep 2026 14:20:43 +0800 From: Zhe Liu To: mkoutny@suse.com Cc: bsegall@google.com, cgroups@vger.kernel.org, corbet@lwn.net, dietmar.eggemann@arm.com, hannes@cmpxchg.org, juri.lelli@redhat.com, kprateek.nayak@amd.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, liuzhe1@kylinos.cn, mgorman@suse.de, mingo@redhat.com, peterz@infradead.org, rostedt@goodmis.org, skhan@linuxfoundation.org, tj@kernel.org, vincent.guittot@linaro.org, vschneid@redhat.com, stable@vger.kernel.org Subject: [PATCH v2 1/3] sched/fair: Remove the write-order dependency between cpu.max and cpu.max.burst Date: Fri, 4 Sep 2026 14:20:11 +0800 Message-Id: <20260904062013.504236-2-liuzhe1@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260904062013.504236-1-liuzhe1@kylinos.cn> References: <20260904062013.504236-1-liuzhe1@kylinos.cn> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Keep the configured burst independent of the current quota and cap it when CFS refills runtime. This allows quota and burst updates in either order. Fixes: f4183717b370 ("sched/fair: Introduce the burstable CFS controller") Cc: stable@vger.kernel.org Signed-off-by: Zhe Liu --- kernel/sched/core.c | 3 +-- kernel/sched/fair.c | 3 ++- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index f78275192036..5269b8cfcf7f 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -10159,8 +10159,7 @@ static int tg_set_bandwidth(struct task_group *tg, if (quota_us != RUNTIME_INF && quota_us > max_bw_runtime_us) return -EINVAL; - if (quota_us != RUNTIME_INF && (burst_us > quota_us || - burst_us + quota_us > max_bw_runtime_us)) + if (burst_us > max_bw_runtime_us) return -EINVAL; #ifdef CONFIG_CFS_BANDWIDTH diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6d881e530f89..488de18d477e 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6627,7 +6627,8 @@ void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b) cfs_b->nr_burst++; } - cfs_b->runtime = min(cfs_b->runtime, cfs_b->quota + cfs_b->burst); + cfs_b->runtime = min(cfs_b->runtime, + cfs_b->quota + min(cfs_b->burst, cfs_b->quota)); cfs_b->runtime_snap = cfs_b->runtime; } -- 2.25.1