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Thu, 25 Jun 2026 12:48:37 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.39.20.6]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 25 Jun 2026 12:48:36 +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, yury.norov@gmail.com, kprateek.nayak@amd.com, iii@linux.ibm.com, corbet@lwn.net Cc: sshegde@linux.ibm.com, tglx@kernel.org, gregkh@linuxfoundation.org, pbonzini@redhat.com, seanjc@google.com, vschneid@redhat.com, huschle@linux.ibm.com, rostedt@goodmis.org, dietmar.eggemann@arm.com, maddy@linux.ibm.com, srikar@linux.ibm.com, hdanton@sina.com, chleroy@kernel.org, vineeth@bitbyteword.org, frederic@kernel.org, arighi@nvidia.com, pauld@redhat.com, christian.loehle@arm.com, tj@kernel.org, tommaso.cucinotta@gmail.com, maz@kernel.org, rafael@kernel.org, rdunlap@infradead.org, kernellwp@gmail.com, linux-doc@vger.kernel.org Subject: [PATCH v5 12/24] sched/debug: Add migration stats due to non preferred CPUs Date: Thu, 25 Jun 2026 18:16:36 +0530 Message-ID: <20260625124648.802832-13-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260625124648.802832-1-sshegde@linux.ibm.com> References: <20260625124648.802832-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-doc@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-ORIG-GUID: bqzwB4xBvzcMS_eiOryJxPrDp-n2dcPU X-Proofpoint-GUID: CzgkQ6NGyMZC-CI0s5yiDnlwdMZvLgFt X-Authority-Analysis: v=2.4 cv=Y4XIdBeN c=1 sm=1 tr=0 ts=6a3d23b3 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=-i9lZGrASMRMKgkbeRgA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjI1MDExMCBTYWx0ZWRfX8O468ZyFnkKW 3cUnMAk2NgM1oO1H0H4OCiLvlYOSjCbhJ6tBxVAwS6WFGmqBczOzPuU//xlnQIVLRE45TSNYXsi CR+Jig9h0+4MYgJ1CdBwrLvOaVcZssjlOEMVetPXdGLSEJM+hGvCPQPCpQosihGhdwARMBZZ7zk 0dTxRKjK9N044yshX8xyniMzAP54jtLyaSt+mgG9EwiZGld5Zm9SSJ5ffWIz6rebMkxv2bqh/OF WTA/zTaDbmjtcQU1afbRlNNqS7TP2MdyfbgjdEDqbSuyFLgCeQRmC2mj6EIAHyG9x3vC5E2h95H kbgttebK1tU5l/DAoQQZANqcDODQA2MbvdI8NHuXU3p24hdUZTtjtmBdacSMIgJ7WIM4jas9tv1 pZHEXanJMXTiZ9vRX2iruS59gXTQXytgEyxAX2aeaW9apbPekJfRRTbNTii/kGXkhrunKtek9RG +bBgq4AGctUNlOk6P7A== X-Proofpoint-Spam-Info: AW1haW4tMjYwNjI1MDExMCBTYWx0ZWRfX1GKHoKhNjU1H qRN7fHu+44QXQgSwnd8v/HyPcBM6tzktIoRSAqAA3zddZa/WqmfKeDc8VKkPuRnJjZkPQAr/VWy QpH3qLYu0nwInOlQKDk8hs5R9bGsd18= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-25_01,2026-06-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 spamscore=0 clxscore=1015 suspectscore=0 impostorscore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606250110 Add a new stat. - 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 | 4 +++- kernel/sched/debug.c | 1 + 3 files changed, 5 insertions(+), 1 deletion(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index 27dbf676113e..32f4743326f8 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 1e42078251d5..fdfefdca74dc 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -11336,8 +11336,10 @@ static int sched_non_preferred_cpu_push_stop(void *arg) context_unsafe_alias(rq); - if (task_rq(p) == rq && task_on_rq_queued(p)) + if (task_rq(p) == rq && task_on_rq_queued(p)) { rq = __migrate_task(rq, &rf, p, cpu); + schedstat_inc(p->stats.nr_migrations_cpu_non_preferred); + } rq_unlock(rq, &rf); raw_spin_unlock_irq(&p->pi_lock); diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index f3a033b34ba0..106b448cafb6 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1363,6 +1363,7 @@ 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