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Wed, 1 Jul 2026 14:19:20 +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 v6 10/23] sched/debug: Add migration stats due to non preferred CPUs Date: Wed, 1 Jul 2026 19:46:41 +0530 Message-ID: <20260701141654.500125-11-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260701141654.500125-1-sshegde@linux.ibm.com> References: <20260701141654.500125-1-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-GUID: JzIWF3PXm9U8KQwVZvjwcbtfeQFPduse X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAxMDE1MCBTYWx0ZWRfX5BA3mgGd75mW bSx9XV0rXE+JA6GGpYwST54Ds7cVr7dzOEQcCqVwaINLOAvYd71Hi/ktvSeJYQgOCr5Z97nhYf5 tfNN5PCzV1qF4hQP59oxoRMsH4NpifU= X-Authority-Analysis: v=2.4 cv=edsNubEH c=1 sm=1 tr=0 ts=6a4521fb cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=reV6gSKdhkwKWsx3P_QA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAxMDE1MCBTYWx0ZWRfX6Vvo9BaXhmGB iYVm+GLpRTz2pyQyhG7kysM8UxzOcsvYWKiw39geR4DFRn7PTgR/viM+MPOjofCfI32AxK2IDn9 t5dsgOiiZQCRlHqJbGWcb0Q7F/LDLYhXvRCKuCFP7IvFRKjeMOKgC6gJE7rXcS9wBWWK8i0Cd6W UJ0wK+kF8oSsPgQS5aPUL7b7haUGpOag10njBvfEpJNnpjk2rE7NNQ95CtkNdWSd2oXDD9r64Hz mfnSoIRBf/b9nJA6Rq3L23fRfYa6hudYYPLl2llMsWYwLVX4aJ7rXA63o4Gul/taBMHmoXQIynJ jVvK4OUfdatD6phGRakDe9iptnIHwopXz0ZxxjfrMGBbVM5Au47nkNy4cXJpop5KBBvntNcdgJh UmBBBFV4EeOTivGg8VbvD93tYcEDqrMRcqHZmmWb5IV+l1hkqhEHder2vLsNnwCo9EiQNKKAcL1 GlXVG9Nod96aUTxqpdw== X-Proofpoint-ORIG-GUID: Ou7pV8CBfav8729r7y0TCIzGYGtyDLuv 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=2026-07-01_03,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 adultscore=0 impostorscore=0 bulkscore=0 spamscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607010150 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 968b18a7f470..37849d2f1dbd 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 56905bac9525..0dffa3a722f2 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -11348,8 +11348,10 @@ 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 72236db67983..5ebb2055e6d5 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1446,6 +1446,7 @@ 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