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Sun, 18 Oct 2026 23:42:44 -0700 (PDT) From: Yafang Shao To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, akpm@linux-foundation.org, david@kernel.org, gourry@gourry.net, tj@kernel.org, hannes@cmpxchg.org, mkoutny@suse.com, shakeel.butt@linux.dev, roman.gushchin@linux.dev, yu.c.chen@intel.com, zhao1.liu@intel.com, tim.c.chen@linux.intel.com, lizhe.67@bytedance.com Cc: bpf@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Yafang Shao Subject: [RFC PATCH v3 bpf-next 2/5] sched: use static_branch_likely() for the NUMA balancing tick check Date: Mon, 19 Oct 2026 14:41:54 +0800 Message-ID: <20261019064157.29885-3-laoar.shao@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20261019064157.29885-1-laoar.shao@gmail.com> References: <20261019064157.29885-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit task_tick_fair() checks sched_numa_balancing on every tick. The static_branch_unlikely() annotation reserves the nop for the disabled case, so the default configuration (NUMA_BALANCING_DEFAULT_ENABLED=y) pays a taken jump per tick. Flip the polarity to static_branch_likely() so that the fast path matches the default. Signed-off-by: Yafang Shao --- kernel/sched/fair.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 973647ad6c2d..71dc47d6114d 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -15351,7 +15351,7 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued) if (queued) return; - if (static_branch_unlikely(&sched_numa_balancing)) + if (static_branch_likely(&sched_numa_balancing)) task_tick_numa(rq, curr); task_tick_cache(rq, curr); -- 2.52.0