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Mon, 10 Aug 2026 04:54:46 -0700 (PDT) Received: from lima-kdev.local ([85.99.180.157]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4995e9f060bsm299389935e9.7.2026.08.10.04.54.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Aug 2026 04:54:45 -0700 (PDT) From: Kayra Cizmeci To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak Cc: Kayra Cizmeci , linux-kernel@vger.kernel.org Subject: [PATCH] sched/fair: Drop min_vruntime() call from set_protect_slice() Date: Mon, 10 Aug 2026 14:54:22 +0300 Message-ID: <20260810115422.38390-1-kayracizmeci@gmail.com> X-Mailer: git-send-email 2.53.0 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 Content-Type: text/plain; charset="utf-8" The branch is only taken when slice is not equal to se->slice, and that means se->slice is bigger than slice, since after the min() call, slice is assigned the smaller one of se->slice and slice. The min_vruntime comparison always picks the calculated value, since it is smaller. So, skip the comparison by not calling min_vruntime and assign the calculated value directly to vprot. No functional change intended. Signed-off-by: Kayra Cizmeci --- I only did a boot test on x86 (Zen 3), since the change is well below my no= ise floor. kernel/sched/fair.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index d78467ec6ee1..97506b2edf7d 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1090,8 +1090,13 @@ static inline void set_protect_slice(struct cfs_rq *= cfs_rq, struct sched_entity slice =3D cfs_rq_min_slice(cfs_rq); =20 slice =3D min(slice, se->slice); + /* + * slice < se->slice, so the calculated value + * is always before se->deadline. + * No comparison needed. + */ if (slice !=3D se->slice) - vprot =3D min_vruntime(vprot, se->vruntime + calc_delta_fair(slice, se)); + vprot =3D se->vruntime + calc_delta_fair(slice, se); =20 se->vprot =3D vprot; } --=20 2.53.0