From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.4]) (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 9ABFD407CF6 for ; Fri, 4 Sep 2026 08:53:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.4 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788512039; cv=none; b=kh7A92idpmTL3UStVCZZLdk4bnqhzhjzJ/WB6iNqp5qvZlnG8KboZl/+Qb+IsBp0N7NtFdvnXeGWHPOPG5Dblc63qB009FO9/GDyI1K4VaXtkG4q8er8Psk/Q4Mw25Hab7NnOcCBGbLxksBBbAcXR3DHwfoTXQHHqD921Zk3zoU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788512039; c=relaxed/simple; bh=KkG7bTYiub/KZcutJMSAzwPmE080XoSZe9sBHx4wg7M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=h2+AyDFkGJLgikFAe+QafhASunu58vwbDleJzmpdfechYH8D/DcqKQttloNWneJC1Mf2RZDMsmK3/G/SbtPylePmX3lMKuaM0xNg7/VCsgO5f/Eb3DEmoaHZ1Ds9IFIBTQ47k32ItHJD6MrushScyeXKcjgtEvK0y8vtgk9gGEs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=Q8i2bPUT; arc=none smtp.client-ip=220.197.31.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="Q8i2bPUT" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=hA x8w5AcMi7n+SFwKUZWgCYZLD2AoFWcDhf8c+ycqro=; b=Q8i2bPUT9VuiSlo2MG TULRZo0TqBFgH+ytd9iobBrtGQD9fl2C5Nn3r3bi+yj6px5iw26eHXIN7KjThvVT rgWBo1yrNmt9wKjoTTiQ3zBGkD0DJy0x82gM00aYbQjk2Ot9z7yb/A1staI9/ze9 4HQ2KOigjd9syaIKdV3JHddCw= Received: from localhost (unknown []) by gzga-smtp-mtada-g0-1 (Coremail) with SMTP id _____wDn9+fehppqOQ1sAg--.49843S2; Fri, 04 Sep 2026 16:52:47 +0800 (CST) From: Hui Su To: peterz@infradead.org, mingo@redhat.com, tim.c.chen@linux.intel.com, yu.c.chen@intel.com, kprateek.nayak@amd.com Cc: juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, connoro@google.com, jstultz@google.com, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/2] sched/numa: Drive NUMA task tick from execution context Date: Fri, 4 Sep 2026 16:52:43 +0800 Message-ID: <20260904085244.799276-2-sh_def@163.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260904085244.799276-1-sh_def@163.com> References: <20260904085244.799276-1-sh_def@163.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 X-CM-TRANSID:_____wDn9+fehppqOQ1sAg--.49843S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxJw1kGr4rWFW3CF1Dtw18Krg_yoWrWFykpa yDWa1DJw4UKayjgF1xZrWDuw13Gwn7A347WFs5GrZYkr1rKw4Fgr1vqF1avF4Ykr40kFy2 vr4qk3y7Kr1UKr7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07jbUUUUUUUU= X-CM-SenderInfo: xvkbvvri6rljoofrz/xtbCwR8aeWqaht-MbAAA30 Proxy execution separates the scheduling context in rq->donor from the execution context in rq->curr. sched_tick() invokes task_tick() for the donor's scheduling class. task_tick_numa() operates on state associated with the task actually executing, including its mm and NUMA work state. With proxy execution, rq->donor provides the scheduling context while rq->curr identifies the execution context. Task-level execution runtime is likewise accounted to rq->curr, and task_tick_numa() uses that runtime to drive periodic NUMA scanning. Keeping task_tick_numa() under task_tick_fair() also means that it is not invoked when a fair task executes on behalf of an RT or deadline donor. Move NUMA tick handling into a scheduler helper for the execution context, and invoke it from both sched_tick() and sched_tick_remote(). Fixes: 7de9d4f94638 ("sched: Start blocked_on chain processing in find_proxy_task()") Suggested-by: K Prateek Nayak Suggested-by: Tim Chen Signed-off-by: Hui Su --- kernel/sched/core.c | 14 ++++++++++++++ kernel/sched/fair.c | 7 ++----- kernel/sched/sched.h | 1 + 3 files changed, 17 insertions(+), 5 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index f78275192036..4db55e4ace9e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5762,6 +5762,17 @@ static int __init setup_resched_latency_warn_ms(char *str) } __setup("resched_latency_warn_ms=", setup_resched_latency_warn_ms); +static void sched_tick_exec_ctx(struct rq *rq) +{ + struct task_struct *curr = rq->curr; + + if (curr->sched_class != &fair_sched_class) + return; + + if (static_branch_unlikely(&sched_numa_balancing)) + task_tick_numa(rq, curr); +} + /* * This function gets called by the timer code, with HZ frequency. * We call it with interrupts disabled. @@ -5794,6 +5805,8 @@ void sched_tick(void) resched_curr(rq); donor->sched_class->task_tick(rq, donor, 0); + sched_tick_exec_ctx(rq); + if (sched_feat(LATENCY_WARN)) resched_latency = cpu_resched_latency(rq); calc_global_load_tick(rq); @@ -5890,6 +5903,7 @@ static void sched_tick_remote(struct work_struct *work) WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 30); } curr->sched_class->task_tick(rq, curr, 0); + sched_tick_exec_ctx(rq); calc_load_nohz_remote(rq); } diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 8dff37059faf..55f0460e4ae3 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4425,7 +4425,7 @@ void init_numa_balancing(u64 clone_flags, struct task_struct *p) /* * Drive the periodic memory faults.. */ -static void task_tick_numa(struct rq *rq, struct task_struct *curr) +void task_tick_numa(struct rq *rq, struct task_struct *curr) { struct callback_head *work = &curr->numa_work; u64 period, now; @@ -4491,7 +4491,7 @@ static void update_scan_period(struct task_struct *p, int new_cpu) #else /* !CONFIG_NUMA_BALANCING: */ -static void task_tick_numa(struct rq *rq, struct task_struct *curr) +void task_tick_numa(struct rq *rq, struct task_struct *curr) { } @@ -15042,9 +15042,6 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued) if (queued) return; - if (static_branch_unlikely(&sched_numa_balancing)) - task_tick_numa(rq, curr); - task_tick_cache(rq, curr); update_misfit_status(curr, rq); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index e656c7059bf8..4d619f272b15 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -4152,6 +4152,7 @@ extern void sched_cache_active_set(void); void sched_domains_free_llc_id(int cpu); extern void init_sched_mm(struct task_struct *p); +void task_tick_numa(struct rq *rq, struct task_struct *p); extern u64 avg_vruntime(struct cfs_rq *cfs_rq); extern int entity_eligible(struct cfs_rq *cfs_rq, struct sched_entity *se);