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Sat, 15 Feb 2025 00:54:45 +0000 From: Prakash Sangappa To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, tglx@linutronix.de, prakash.sangappa@oracle.com Subject: [PATCH 2/2] Sched: Add scheduler stat for cpu time slice extension Date: Sat, 15 Feb 2025 00:54:14 +0000 Message-ID: <20250215005414.224409-3-prakash.sangappa@oracle.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250215005414.224409-1-prakash.sangappa@oracle.com> References: <20250215005414.224409-1-prakash.sangappa@oracle.com> 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-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-14_10,2025-02-13_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 malwarescore=0 adultscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2501170000 definitions=main-2502150006 X-Proofpoint-GUID: 7NwTSfwcjNPxo4w9kb6DqxVzy74ord1B X-Proofpoint-ORIG-GUID: 7NwTSfwcjNPxo4w9kb6DqxVzy74ord1B Content-Type: text/plain; charset="utf-8" Add scheduler stat to record number of times the thread was granted cpu time slice extension. Signed-off-by: Prakash Sangappa --- include/linux/sched.h | 2 ++ kernel/rseq.c | 1 + kernel/sched/core.c | 5 +++++ kernel/sched/debug.c | 1 + 4 files changed, 9 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index 75abe260de72..927d54b665e6 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -327,6 +327,7 @@ extern void io_schedule_finish(int token); extern long io_schedule_timeout(long timeout); extern void io_schedule(void); extern void hrtick_local_start(u64 delay); +extern void update_stat_preempt_delayed(struct task_struct *t); =20 /** * struct prev_cputime - snapshot of system and user cputime @@ -538,6 +539,7 @@ struct sched_statistics { u64 nr_wakeups_affine_attempts; u64 nr_wakeups_passive; u64 nr_wakeups_idle; + u64 nr_preempt_delay_granted; =20 #ifdef CONFIG_SCHED_CORE u64 core_forceidle_sum; diff --git a/kernel/rseq.c b/kernel/rseq.c index 9f83d47253ce..230cb84036b1 100644 --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -451,6 +451,7 @@ bool rseq_delay_resched(void) return false; =20 t->rseq_sched_delay =3D 1; + update_stat_preempt_delayed(t); =20 return true; } diff --git a/kernel/sched/core.c b/kernel/sched/core.c index cee50e139723..034c76f0514c 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -924,6 +924,11 @@ void hrtick_local_start(u64 delay) rq_unlock(rq, &rf); } =20 +void update_stat_preempt_delayed(struct task_struct *t) +{ + schedstat_inc(t->stats.nr_preempt_delay_granted); +} + static void hrtick_rq_init(struct rq *rq) { #ifdef CONFIG_SMP diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index ef047add7f9e..e160e14b348f 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1213,6 +1213,7 @@ void proc_sched_show_task(struct task_struct *p, stru= ct pid_namespace *ns, P_SCHEDSTAT(nr_wakeups_affine_attempts); P_SCHEDSTAT(nr_wakeups_passive); P_SCHEDSTAT(nr_wakeups_idle); + P_SCHEDSTAT(nr_preempt_delay_granted); =20 avg_atom =3D p->se.sum_exec_runtime; if (nr_switches) --=20 2.43.5