From nobody Sun Dec 14 19:19:38 2025 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (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 5A7A121CC64 for ; Fri, 18 Apr 2025 19:34:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.177.32 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745004875; cv=none; b=R/KJe3CdJ//RjkmSA2czIBV/I9KEbpyoCTkMUhpmK1a7/8Lg5TwJXLNJxfIGzTVQsATS/IuGbItn6eoP7KaQLtqLUTpO9/aRQQFx4rzWTAN8qWrZoJrv3HHS4v4XMYPmYWZPhnDMkvULEWYO4NVpmg1x+gjbRnqCNCrjb5WG66w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745004875; c=relaxed/simple; bh=JRPNpxrZJesS5QZm+9qn4/l+3J4kbs3kiiEObTDlEew=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QcWLVuxkRHpjVBx16AQSaZQKNRpFoWIazQdt6OLcFBy5V7pQLBhF1D45o0Afs7Zv+zxJbbbwHfuBwVH5x3uO2ZSECNooLs2g+WcDVV2CMLBYGN/an+hreD7RkLwQw+5JDsgX3ZLh8kfRaa7hubhj+Avrn6V4XegBtaYZzqfe31I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=N8If/W8N; arc=none smtp.client-ip=205.220.177.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="N8If/W8N" Received: from pps.filterd (m0246630.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 53IJCe40005929; Fri, 18 Apr 2025 19:34:16 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=corp-2023-11-20; bh=HYM1W FhUNRWnr9m7RbnDdHVWykeNIG5BuW9k+n6uhJQ=; b=N8If/W8N1LAyzip2kgPFA 2KVhC3S0C/eWh9IkrWxkm0LwlFQFgexCGApjpHrT/AZJntyCisalqFOncDMTUHCh V1DEXKANLWgoOoba+oQdFGR3q3EyuYsNqHed+d6gkUEIHQY6M4tgBRqPuXfYcsQv WPeVaOL57OMP8ljH/MoSZnFaaTm9JLM3BXMtTbmBzOB7dG7WiN8GwbGtIk6jEyhb EsoMf70f0yHyOVZdQ+aQLQA61j3Rjg8Q88o6JjX8SAWSWGtrAiTF+il+shNGbjym vsSmssJ8pMGIjlpDWYOZvMInNeuPxnKQ1bjDHGC4sks3h4xekLcouFES7vLchPnF w== Received: from iadpaimrmta03.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta03.appoci.oracle.com [130.35.103.27]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 46185n0nuf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 18 Apr 2025 19:34:15 +0000 (GMT) Received: from pps.filterd (iadpaimrmta03.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta03.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 53IIn28l038828; Fri, 18 Apr 2025 19:34:15 GMT Received: from psang-work.osdevelopmeniad.oraclevcn.com (psang-work.allregionaliads.osdevelopmeniad.oraclevcn.com [100.100.253.35]) by iadpaimrmta03.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 460d4w8qqy-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 18 Apr 2025 19:34:15 +0000 From: Prakash Sangappa To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, tglx@linutronix.de, bigeasy@linutronix.de Subject: [PATCH V2 3/3] Sched: Add scheduler stat for cpu time slice extension Date: Fri, 18 Apr 2025 19:34:10 +0000 Message-ID: <20250418193410.2010058-4-prakash.sangappa@oracle.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250418193410.2010058-1-prakash.sangappa@oracle.com> References: <20250418193410.2010058-1-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:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-18_07,2025-04-17_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 suspectscore=0 spamscore=0 bulkscore=0 mlxscore=0 phishscore=0 malwarescore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2502280000 definitions=main-2504180148 X-Proofpoint-ORIG-GUID: 7JGZ84SkMdejhFq0dD7iB-kjSakjkkQB X-Proofpoint-GUID: 7JGZ84SkMdejhFq0dD7iB-kjSakjkkQB 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 c91856f908d6..2c5c928f1128 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 @@ -541,6 +542,7 @@ 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 7022729d02ee..d8e3bf126248 100644 --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -453,6 +453,7 @@ 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 59b381cef472..6a08e6ece98d 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -931,6 +931,11 @@ 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