From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (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 F10EB145FE0 for ; Tue, 7 Apr 2026 19:21:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775589694; cv=none; b=AgZsS8oCEMZIPyO1YHZMYWz4KUNgKsLzk6oCB24iCgwC6f69dWd8Fz9SYedeBacSuUmsViP47Gn9zzF2n3NkXfBjZPTHz2slVYYUQHcfHo5E7I+t3ZJOeRlrHM8Z/mA63QirgIhPYa8kmLs+w9x44lSpdsTjEcUUoq6oOiBHt9k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775589694; c=relaxed/simple; bh=1HH0IDqJfr+bByCFARwjq8MnBfX6Qg7nDr7P9gyHMCM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WusdzefxFUZ3a7Z5HYHKupQAELDYpCoildBxwJzTKDHV8L0Gc97owt0PT494UAl29M7E4MvMZPvnYK6x60PSI6NYJ7WX1yFW+AZLW4nM3WiYn7Kd7RF7VprJtiUJJ6rx7H2iH+iU+MDiIUB8KdsCmtqPGXG4MaWLkgHCMuwoRuo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=BPS7KrSn; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="BPS7KrSn" Received: from pps.filterd (m0356517.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 637DtuJI2302957; Tue, 7 Apr 2026 19:21:11 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=E8zB3gNEfZWonsRz/ L9j8D9xAwORUWvVYSxIklrwLO4=; b=BPS7KrSnz9+3ciBzYUkdTsiBkjeBP/YGj 9bo7Hz5uTrbraG9okgSzZ7AkL05uju2U8tclMavQo/4MznTLJdtddRTiGlIAyQFv R088LsXvcgQ/LnxKy6CRasIsCsybzlUptd7ipxqI3Dgk8YzUsO0qTTv4R2EXMAuD 5cBDT26rMf7XKU0AHUoIPi69/InBRrhn1+v76NQLDhjj00fnMRzs7Q5zOAe4uE+m 1sLCq5MG8iok9Llxv4Niv6OPczZVv0XXySWEoOj11DiliPTGIUPEjc0S4Ub2U96h p0gKTDRZQBHqhTNtNsTwSjb9vKtRK2Q8LnOR5SPQBY7RBs2DfYM/A== Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4dcn2fcskp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 07 Apr 2026 19:21:10 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 637Ijtcw014352; Tue, 7 Apr 2026 19:21:09 GMT Received: from smtprelay04.fra02v.mail.ibm.com ([9.218.2.228]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 4dcmg4mhv9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 07 Apr 2026 19:21:09 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay04.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 637JL5OD7275004 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 7 Apr 2026 19:21:05 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A8B4D20040; Tue, 7 Apr 2026 19:21:05 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 39C4C2004B; Tue, 7 Apr 2026 19:21:01 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.39.20.194]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 7 Apr 2026 19:21:00 +0000 (GMT) From: Shrikanth Hegde To: linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, tglx@linutronix.de, yury.norov@gmail.com, gregkh@linuxfoundation.org Cc: sshegde@linux.ibm.com, pbonzini@redhat.com, seanjc@google.com, kprateek.nayak@amd.com, vschneid@redhat.com, iii@linux.ibm.com, huschle@linux.ibm.com, rostedt@goodmis.org, dietmar.eggemann@arm.com, mgorman@suse.de, bsegall@google.com, maddy@linux.ibm.com, srikar@linux.ibm.com, hdanton@sina.com, chleroy@kernel.org, vineeth@bitbyteword.org, joelagnelf@nvidia.com Subject: [PATCH v2 11/17] sched/debug: Add migration stats due to non preferred CPUs Date: Wed, 8 Apr 2026 00:49:44 +0530 Message-ID: <20260407191950.643549-12-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260407191950.643549-1-sshegde@linux.ibm.com> References: <20260407191950.643549-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA3MDE3NSBTYWx0ZWRfX2lpGAOqq0Zwm FT59tvAtSbjUEcmYU4jxvBiT7vua6RRoc+0pn8MprhAJ/B8aZBNH1jG4tbFjAx02rZ1lB+lXNPZ PTW1P1xrsc7FjARV6TGkoVx3LyKDOVStK0wkrSlyPoRaMgBuThfnDn1nq5lvl6ajFmSyusICWaK Ama9T0RrfOQJRPa5Esq6JMBu3+NifpO7kW0NVjWllJgsQD0kuQ8yLVfgPpMnkoIlS2XL5IzyhT8 MEkLGMP/JG1anhKeys0oAA8S/N3ERkvFTcc1bjjULfHB0qbT1TZfZSdJTRi59SNsFHQduSZz2BU qZdYY8AKqg7dp9gB5hW4VqDR6rM+6HLg8J5BsQhQHJ3OPaacTauwF+lQCW6q/tfXjPEQDDFGK0N Izkbhd/MBqw12X2niOiZlPQPAf/1Vegj3wr14TwnHA/+E66IhxCy9pctQ5risF03a2BYdMhaEWz F9gGpEFvmhDQFmH8rAg== X-Authority-Analysis: v=2.4 cv=FsY1OWrq c=1 sm=1 tr=0 ts=69d55926 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=-i9lZGrASMRMKgkbeRgA:9 X-Proofpoint-ORIG-GUID: zAG4Gw6epC61Ly-_eSNBmNig1vxdBUV1 X-Proofpoint-GUID: JnlGpYV2W7lK86SANkNUDLT9USjLmc_4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-07_04,2026-04-07_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 impostorscore=0 spamscore=0 phishscore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 malwarescore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604070175 Add new stats. - nr_migrations_cpu_non_preferred: number of migrations happened since a CPU was marked as non preferred due to high steal time. Signed-off-by: Shrikanth Hegde --- include/linux/sched.h | 1 + kernel/sched/core.c | 1 + kernel/sched/debug.c | 1 + 3 files changed, 3 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index 1eb3825bcaeb..6c0d5d36f21c 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -554,6 +554,7 @@ struct sched_statistics { u64 nr_failed_migrations_running; u64 nr_failed_migrations_hot; u64 nr_forced_migrations; + u64 nr_migrations_cpu_non_preferred; u64 nr_wakeups; u64 nr_wakeups_sync; diff --git a/kernel/sched/core.c b/kernel/sched/core.c index b375c500d49e..7a9442439eb2 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -11321,6 +11321,7 @@ void sched_push_current_non_preferred_cpu(struct rq *rq) local_irq_save(flags); get_task_struct(push_task); + schedstat_inc(push_task->stats.nr_migrations_cpu_non_preferred); rq_lock(rq, &rf); rq->push_task_work_done = 1; diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index f8a43fc13564..482c86a0ff80 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1305,6 +1305,7 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, P_SCHEDSTAT(nr_failed_migrations_running); P_SCHEDSTAT(nr_failed_migrations_hot); P_SCHEDSTAT(nr_forced_migrations); + P_SCHEDSTAT(nr_migrations_cpu_non_preferred); P_SCHEDSTAT(nr_wakeups); P_SCHEDSTAT(nr_wakeups_sync); P_SCHEDSTAT(nr_wakeups_migrate); -- 2.47.3