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Fri, 8 Mar 2024 05:23:31 +0000 (GMT) From: Vishal Chourasia To: peterz@infradead.org, linux-kernel@vger.kernel.org Cc: Vishal Chourasia Subject: [RFC 1/1] sched: Deprecate DOUBLE_TICK feature Date: Fri, 8 Mar 2024 10:53:04 +0530 Message-ID: <20240308052304.1835792-2-vishalc@linux.ibm.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240308052304.1835792-1-vishalc@linux.ibm.com> References: <20240308052304.1835792-1-vishalc@linux.ibm.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-TM-AS-GCONF: 00 X-Proofpoint-GUID: BRCjc4IpKjfSfnqvEH0-kMM9kUzYQyof X-Proofpoint-ORIG-GUID: BRCjc4IpKjfSfnqvEH0-kMM9kUzYQyof X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-08_03,2024-03-06_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 adultscore=0 clxscore=1015 impostorscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 mlxscore=0 spamscore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2403080040 Content-Type: text/plain; charset="utf-8" The DOUBLE_TICK feature, introduced to manage the interaction between periodic and high-resolution timer ticks, has become obsolete following the removal of the check_preempt_tick method in commit 5e963f2bd465 ("sched/fair: Commit to EEVDF"). This change rendered the DOUBLE_TICK check in entity_tick pointless, as it no longer influences scheduling decisions. This commit removes the DOUBLE_TICK feature flag, simplifying the scheduler code and eliminating a now-unnecessary check. Signed-off-by: Vishal Chourasia --- kernel/sched/fair.c | 6 ------ kernel/sched/features.h | 1 - 2 files changed, 7 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 533547e3c90a..73e1372d1a0d 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5510,12 +5510,6 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_enti= ty *curr, int queued) resched_curr(rq_of(cfs_rq)); return; } - /* - * don't let the period tick interfere with the hrtick preemption - */ - if (!sched_feat(DOUBLE_TICK) && - hrtimer_active(&rq_of(cfs_rq)->hrtick_timer)) - return; #endif } =20 diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 143f55df890b..f2671bf8d6ab 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -28,7 +28,6 @@ SCHED_FEAT(WAKEUP_PREEMPTION, true) =20 SCHED_FEAT(HRTICK, false) SCHED_FEAT(HRTICK_DL, false) -SCHED_FEAT(DOUBLE_TICK, false) =20 /* * Decrement CPU capacity based on time not spent running tasks --=20 2.43.0