From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f51.google.com (mail-wm1-f51.google.com [209.85.128.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 03B303AA4F8 for ; Fri, 4 Sep 2026 11:06:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788520020; cv=none; b=BXH7eZoV2VwuYh+2tcGLEcU1wcVPNKY7XX9te5FWNPvqphOWS898B4sxsf0xfVhQPF9SaZAbPJ5ILhyWgrNDIdvOlicMOhat6VS9WQvoKNKMr0a0tol4TZBVzD5LYtJBAyYv8pgSKfMtO96M/ZYoPQl8Hri8/mNiI+R6CEOlYq4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788520020; c=relaxed/simple; bh=SF/YlEQK954Oqqw1MugM1o137YjqR+3X+umSu4LOZR4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=mARXFS+gQUI/6fYxa353OnupjJarXXPRpEFp76KxRoDQhXSu7fvhC+VgklrbckjmFhc7tf2ydpNI7xpZQLyaCBbLtgYsD/JikF/bKMLK7DhjrGcnx3o3xB/ou8O4WQSjXHLy0Wtk0Fh223ALOM0SbpmCRa/mhOFlboO9JzlTQvo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b=XuvgT+5m; arc=none smtp.client-ip=209.85.128.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="XuvgT+5m" Received: by mail-wm1-f51.google.com with SMTP id 5b1f17b1804b1-4921eed3fa2so9453345e9.0 for ; Fri, 04 Sep 2026 04:06:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1788520017; x=1789124817; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=LN+05tYUoW+ljcA4oJQdgwn36aZVMFD1VDoe2ImKRvY=; b=XuvgT+5mgB54GA2M4ENjcxfslNkgFqidKhdyQMw9gaK3DTLXVL/PJjxfba6GOX9xXo +JOLj9oep77ursC6wt7TI7YOCXZvazOGIUSo8sqCPbvbB4Yzep8REDt6dJmosWUvHw/B 3r0LGtsrO5JkYaAhznCqf+/oNNhQcHUReZr4+2jCEBIS2ncBfnLUr82l+3GlsBmUw8E+ gzDDCUMEEBDozBHspj0m9EHQ+vgxtg0B9kHk+Ux5Yyg3jiQKkq5H6qSglxQ+6e1lkj73 jDIO4PUrbRReKrnaDKtPsaiBu0AqDQE7b50SBnnHdkvRH3qhMOPBUV332KHTEYpeHYm+ Wp1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788520017; x=1789124817; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=LN+05tYUoW+ljcA4oJQdgwn36aZVMFD1VDoe2ImKRvY=; b=mVf7LIppNdfTCj8BTXE5zJ+6FFk+PgEXj0Kl4DzVvkcZTiW0Scd21vsbpGgXnvqdth HnsrkLjffBTtntGce78hGlVKvktn+AA1/Cs1sb/eCgN05WeZJ1yXwbpj8jI08v70xYQn y9/HKgt62xvq4zbnvxoVtvJmiNG/T8pLAYokypSRzoPppFNt9G6DeEmczNkKyLEDAFR1 PPU7RKCiiOuc0OK/GyS9Rb1fbYsscielhvR7gqsN5eoikqZipWa5nj1Bbhy4A2hxfA35 E1uxSOGKQdtVmo6rJNDa4ILJgO8eTGfJxLmrsr7tfCwhyw7iJCc37Pbs1k5wxwMCpioG OW4g== X-Forwarded-Encrypted: i=1; AKwUvBxJXW9RwTGmpRIpI9KLF/2WdeRtN1lwANBwxGqlFO4lj/8RL0+Bh3Sx7hS9y1VuhDNLqki2w0EeBsGrGGk=@vger.kernel.org X-Gm-Message-State: AFuF++nhlkxDQHQLOMQ9qmYipHLcpZZ2P5APNqx0zUe1CRuL8C/htKh5 Wbp60RJUi3akwEXHG5DzKV8cx+qu5P0YWs023R82or1nTQpIQiJF4YuEQZNbOZgLVpw= X-Gm-Gg: AYBFou2OZN8qVOIdYMIneKw2buS6fnlQYxwshmhV0dN0JTz/3IB6QgLOM7+iMvpEzZI ea+yvxWiY081r3GlsAY6x6HdslAAGx8yP+Smv5WTh1/TrvEdp+/Sdo84DEfbXxQTvzgwYExwWxs ooYzSYe8+VtnpZ8UxHrZOXwfPNbawZB3u5vKMYLfUz2/N0MB5WAexm9UHl9QCb1pvw4gO1VEpeS E+2MUkBkVoBUWF6naWjR5xTE7XJkapT8WJkKE9UPPtKvWrFdt9612uRrvs5c+Xj+iPbkIcNab3x k/A80gkyp+GaK92ia73iDslZa0YEPuqq7ATDPHyAoOUCXUgv+rnSoF0+x5hPcW6YMF+Ut3bUiRU HW2bd+k7ZlXml3+boTZ1YnIWoO2H129Ixz4ZHA2gI+e9MgsS/9dOGCwATrWmp+PrKuvmuZ2H4q3 LHJO2+6St+8UMup7/0ZalJN+SlRsenbptrlKV4j7pT7h8UBksx/8+aWqUEFrtWnNIdI59iSjfLY m6ipGigrade2mWDiFUFoAKY X-Received: by 2002:a05:600c:4709:b0:49c:fa21:e748 with SMTP id 5b1f17b1804b1-49cfa21e99bmr29698025e9.30.1788520016817; Fri, 04 Sep 2026 04:06:56 -0700 (PDT) Received: from localhost (109-81-91-122.rct.o2.cz. [109.81.91.122]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49cee7fec25sm161987755e9.13.2026.09.04.04.06.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Sep 2026 04:06:56 -0700 (PDT) Date: Fri, 4 Sep 2026 13:06:55 +0200 From: Michal Hocko To: Ye Liu Cc: Tony Luck , Reinette Chatre , x86@kernel.org, Christian Brauner , Andrew Morton , Jann Horn , "David Hildenbrand (arm)" , "Mike Rapoport (Microsoft)" , Alexey Dobriyan , Lorenzo Stoakes , Oleg Nesterov , Ye Liu , Dave Martin , James Morse , Babu Moger , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH 6/8] fs: convert process/thread iterators to for_each_*_rcu Message-ID: References: <20260904083001.553587-1-ye.liu@linux.dev> <20260904083001.553587-7-ye.liu@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260904083001.553587-7-ye.liu@linux.dev> On Fri 04-09-26 16:29:58, Ye Liu wrote: > From: Ye Liu > > Replace the manual rcu_read_lock()/rcu_read_unlock() pairs combined > with for_each_process() and for_each_process_thread() loops in fs/ > with the for_each_*_rcu() macros. > > No functional change. > > Signed-off-by: Ye Liu Acked-by: Michal Hocko > --- > fs/proc/base.c | 4 +--- > fs/resctrl/rdtgroup.c | 8 ++------ > 2 files changed, 3 insertions(+), 9 deletions(-) > > diff --git a/fs/proc/base.c b/fs/proc/base.c > index 6a39de424f62..da36ba73dc17 100644 > --- a/fs/proc/base.c > +++ b/fs/proc/base.c > @@ -1160,8 +1160,7 @@ static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) > if (mm) { > struct task_struct *p; > > - rcu_read_lock(); > - for_each_process(p) { > + for_each_process_rcu(p) { > if (same_thread_group(task, p)) > continue; > > @@ -1177,7 +1176,6 @@ static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) > } > task_unlock(p); > } > - rcu_read_unlock(); > mmdrop(mm); > } > err_unlock: > diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c > index 5dcbb0a964e8..3f96d21b84ab 100644 > --- a/fs/resctrl/rdtgroup.c > +++ b/fs/resctrl/rdtgroup.c > @@ -709,14 +709,12 @@ int rdtgroup_tasks_assigned(struct rdtgroup *r) > > lockdep_assert_held(&rdtgroup_mutex); > > - rcu_read_lock(); > - for_each_process_thread(p, t) { > + for_each_process_thread_rcu(p, t) { > if (is_closid_match(t, r) || is_rmid_match(t, r)) { > ret = 1; > break; > } > } > - rcu_read_unlock(); > > return ret; > } > @@ -826,15 +824,13 @@ static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s) > struct task_struct *p, *t; > pid_t pid; > > - rcu_read_lock(); > - for_each_process_thread(p, t) { > + for_each_process_thread_rcu(p, t) { > if (is_closid_match(t, r) || is_rmid_match(t, r)) { > pid = task_pid_vnr(t); > if (pid) > seq_printf(s, "%d\n", pid); > } > } > - rcu_read_unlock(); > } > > static int rdtgroup_tasks_show(struct kernfs_open_file *of, > -- > 2.25.1 > -- Michal Hocko SUSE Labs