From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.5]) (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 261FB30E838 for ; Thu, 3 Sep 2026 04:12:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788408778; cv=none; b=aCyqJGpjjcWvQATD3g9g9UuXrAKLmGea3cAaWAmEX3Ewy0hRTllk9iieKQs+lsmzprzc7JNC4tsJHwWumu3h1gjkonmc6RZ/y3lTvElrje2yDnAZAANb9V8TqqLX9L0CRXJFW5ObbxLN3/URiguZC5OjHNDeQYlA+2nUoNbJmFg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788408778; c=relaxed/simple; bh=J559weD5kUpaFu/yAoxMAXqRSs5m3TYOhd/sHenqb+A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=owY7MxXQJUYNiJbB87jMKZvevu/u40SJXVCJ8kqekHysQQv6C3S61NXcJNgtBOh8YkmXVvT155Ah8jZTDkq8uKZo76fyP24AJhoEincUOnl+CV0PcC5KZrwRPJfYzc9yugthSdg0wl9ZQUPFERnBlwgMFLO6HwWi4tK9FZVNRVM= 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=o5UPnOpQ; arc=none smtp.client-ip=220.197.31.5 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="o5UPnOpQ" 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=LH Vz9svOhbr0+vbADkke0zIeA+ySfVqSs6u+KbFwfZ8=; b=o5UPnOpQPACJMes7DR ACg+t9dd3aunVKU/Qw+FCHbvEZaQj1RfnhfrAQVJv3yV9VS/4c1MWh1dW7GBDZx7 rDULmyAtfblBzY8QC2XPZggBHIHCVdBsLLfci82F6O3rtlwhh8Mle41UiLjdH5Rw rA8xJ3F9ffTkOqI7+1o+TQWnA= Received: from localhost (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wAnXN+M85hqmBQ1AQ--.47753S2; Thu, 03 Sep 2026 12:11:57 +0800 (CST) From: Hui Su To: Peter Zijlstra , Ingo Molnar Cc: Juri Lelli , Vincent Guittot , Dietmar Eggemann , K Prateek Nayak , Valentin Schneider , John Stultz , Chen Yu , Tim Chen , linux-kernel@vger.kernel.org, Hui Su Subject: [PATCH v2 1/2] sched/numa: Drive NUMA task tick from execution context Date: Thu, 3 Sep 2026 12:11:53 +0800 Message-ID: <20260903041154.2479761-2-sh_def@163.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260903041154.2479761-1-sh_def@163.com> References: <20260903041154.2479761-1-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:_____wAnXN+M85hqmBQ1AQ--.47753S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxJw1kGr4rWFW3Cw1fZrWxXrb_yoWrJryUpa yDWa17Ja17ta1jqF18ZrWDua43Gwn7u347WF4kG39Ykr4rK3yFgr10qF4avF4YkrWFkFy2 vr4q93y7Kr1UKw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0piJUUUUUUUU= X-CM-SenderInfo: xvkbvvri6rljoofrz/xtbCwg3gQGqY842P2AAA30 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() is currently called from task_tick_fair(). This works when the donor is a fair task, but not when a fair task executes on behalf of an RT or deadline donor. In that case the donor's task_tick() still updates the execution task's sum_exec_runtime through update_curr_common(), but task_tick_fair() is not invoked and NUMA scan work for the execution task is not driven. Move the NUMA tick handling one level up into sched_tick(), and invoke it when the execution context is a fair task. Do the same in sched_tick_remote() so full-dynticks CPUs continue to receive NUMA tick handling after it is removed from task_tick_fair(). Fixes: 7de9d4f94638 ("sched: Start blocked_on chain processing in find_proxy_task()") Suggested-by: Tim Chen Signed-off-by: Hui Su --- kernel/sched/core.c | 9 +++++++++ kernel/sched/fair.c | 7 ++----- kernel/sched/sched.h | 1 + 3 files changed, 12 insertions(+), 5 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index f78275192036..15fcc218d2fe 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5794,6 +5794,11 @@ void sched_tick(void) resched_curr(rq); donor->sched_class->task_tick(rq, donor, 0); + + if (rq->curr->sched_class == &fair_sched_class && + static_branch_unlikely(&sched_numa_balancing)) + task_tick_numa(rq, rq->curr); + if (sched_feat(LATENCY_WARN)) resched_latency = cpu_resched_latency(rq); calc_global_load_tick(rq); @@ -5891,6 +5896,10 @@ static void sched_tick_remote(struct work_struct *work) } curr->sched_class->task_tick(rq, curr, 0); + if (curr->sched_class == &fair_sched_class && + static_branch_unlikely(&sched_numa_balancing)) + task_tick_numa(rq, curr); + 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); -- 2.54.0