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joel@joelfernandes.org, joshdon@google.com, juri.lelli@redhat.com, kprateek.nayak@amd.com, linux-kernel@vger.kernel.org, mgorman@suse.de, mingo@kernel.org, patrick.bellasi@matbug.net, pavel@ucw.cz, pjt@google.com, qperret@google.com, qyousef@layalina.io, rostedt@goodmis.org, tglx@linutronix.de, tim.c.chen@linux.intel.com, timj@gnu.org, vincent.guittot@linaro.org, youssefesmat@chromium.org, yu.c.chen@intel.com, daniel.m.jordan@oracle.com Subject: [PATCH] sched/fair: Preserve PLACE_DEADLINE_INITIAL deadline Date: Tue, 3 Oct 2023 21:17:37 -0400 Message-ID: <20231004011737.188682-1-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230531124604.068911180@infradead.org> References: <20230531124604.068911180@infradead.org> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BLAPR03CA0059.namprd03.prod.outlook.com (2603:10b6:208:32d::34) To SA1PR10MB5711.namprd10.prod.outlook.com (2603:10b6:806:23e::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email 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4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: qz4nsFrMSfHl/zWyCJDzhvMV/vY4Sp5xDrwidmV2XT+IU5BI+ILJ6/bDb80kO1SJf0wERFgGklCBh2GUmBC1BgH5knRNIjgi4tqdajAIb8w= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR10MB4828 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-03_20,2023-10-02_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxscore=0 spamscore=0 phishscore=0 bulkscore=0 mlxlogscore=999 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310040006 X-Proofpoint-ORIG-GUID: beeKUWdsc7izn8Fb1HwvACZsWLl7iaCL X-Proofpoint-GUID: beeKUWdsc7izn8Fb1HwvACZsWLl7iaCL Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" An entity is supposed to get an earlier deadline with PLACE_DEADLINE_INITIAL when it's forked, but the deadline gets overwritten soon after in enqueue_entity() the first time a forked entity is woken so that PLACE_DEADLINE_INITIAL is effectively a no-op. Placing in task_fork_fair() seems unnecessary since none of the values that get set (slice, vruntime, deadline) are used before they're set again at enqueue time, so get rid of that and just pass ENQUEUE_INITIAL to enqueue_entity() via wake_up_new_task(). Fixes: e8f331bcc270 ("sched/smp: Use lag to simplify cross-runqueue placeme= nt") Signed-off-by: Daniel Jordan --- Tested on top of peterz/sched/eevdf from 2023-10-03. kernel/sched/core.c | 2 +- kernel/sched/fair.c | 1 - 2 files changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 779cdc7969c81..500e2dbfd41dd 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4854,7 +4854,7 @@ void wake_up_new_task(struct task_struct *p) update_rq_clock(rq); post_init_entity_util_avg(p); =20 - activate_task(rq, p, ENQUEUE_NOCLOCK); + activate_task(rq, p, ENQUEUE_INITIAL | ENQUEUE_NOCLOCK); trace_sched_wakeup_new(p); wakeup_preempt(rq, p, WF_FORK); #ifdef CONFIG_SMP diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index a0b4dac2662c9..5872b8a3f5891 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -12446,7 +12446,6 @@ static void task_fork_fair(struct task_struct *p) curr =3D cfs_rq->curr; if (curr) update_curr(cfs_rq); - place_entity(cfs_rq, se, ENQUEUE_INITIAL); rq_unlock(rq, &rf); } =20 --=20 2.41.0