From patchwork Mon Apr 29 08:46:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Xuewen Yan X-Patchwork-Id: 13646466 Received: from SHSQR01.spreadtrum.com (unknown [222.66.158.135]) (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 74B45C2C8 for ; Mon, 29 Apr 2024 08:47:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=222.66.158.135 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714380427; cv=none; b=FmkWVqJA3GNUF9Mjw01Isesoz0tJw+9hmQvTX1ckD0nWtcpc9XDp0FDJ8fQY6kfCT9XriAqfZJ7qTghmcJs0YVKyS1yAbs3Dsv1mAiUKAfYiP7p6PrGuachOYE1NQ9JAu0a6a0CK2pqGWZUZyAHeMhtt4ZRhPRhJFFDvhRuKOc8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714380427; c=relaxed/simple; bh=4yneeJLx+f0bOXwRDzrvGNhavRWvgBVi9UZ/ywkUr3g=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=FBcYDaKNAhSbtpGAkUvemJmSv0xY4hwICYEl85ZjBtxyyxiVZ2ZT4n65+r1cOnaW9OysOZU8LBLsvSGgsZsbXZg+W/axTR+FIATvYrQNNU35cAIojxg3VbxJGVVkWwSqVjRkk7SzBC5NQPsz0EaN/KC9A3Hi2KDBwuCBX38mBeA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=unisoc.com; spf=pass smtp.mailfrom=unisoc.com; arc=none smtp.client-ip=222.66.158.135 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=unisoc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=unisoc.com Received: from dlp.unisoc.com ([10.29.3.86]) by SHSQR01.spreadtrum.com with ESMTP id 43T8kltI069189; Mon, 29 Apr 2024 16:46:47 +0800 (+08) (envelope-from Xuewen.Yan@unisoc.com) Received: from SHDLP.spreadtrum.com (bjmbx01.spreadtrum.com [10.0.64.7]) by dlp.unisoc.com (SkyGuard) with ESMTPS id 4VScLm0mpmz2K1r9q; Mon, 29 Apr 2024 16:44:00 +0800 (CST) Received: from BJ10918NBW01.spreadtrum.com (10.0.73.73) by BJMBX01.spreadtrum.com (10.0.64.7) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Mon, 29 Apr 2024 16:46:45 +0800 From: Xuewen Yan To: , , , CC: , , , , , Subject: [PATCH] sched/proc: Print user_cpus_ptr for task status Date: Mon, 29 Apr 2024 16:46:33 +0800 Message-ID: <20240429084633.9800-1-xuewen.yan@unisoc.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SHCAS01.spreadtrum.com (10.0.1.201) To BJMBX01.spreadtrum.com (10.0.64.7) X-MAIL: SHSQR01.spreadtrum.com 43T8kltI069189 The commit 851a723e45d1c("sched: Always clear user_cpus_ptr in do_set_cpus_allowed()") would clear the user_cpus_ptr when call the do_set_cpus_allowed. In order to determine whether the user_cpus_ptr is taking effect, it is better to print the task's user_cpus_ptr. For top-cpuset: ums9621_1h10:/ # while true; do done& [1] 6786 ums9621_1h10:/ # cat /proc/6786/status | grep Cpus Cpus_allowed: ff Cpus_allowed_list: 0-7 Cpus_user_allowed: (null) Cpus_user_allowed_list: (null) bind the task to 6-7： ums9621_1h10:/ # taskset -p c0 6786 pid 6786's current affinity mask: ff pid 6786's new affinity mask: c0 ums9621_1h10:/ # cat /proc/6786/status | grep Cpus Cpus_allowed: c0 Cpus_allowed_list: 6-7 Cpus_user_allowed: c0 Cpus_user_allowed_list: 6-7 Offline cpu7: ums9621_1h10:/ # echo 0 > /sys/devices/system/cpu/cpu7/online ums9621_1h10:/ # cat /proc/6786/status | grep Cpus Cpus_allowed: c0 Cpus_allowed_list: 6-7 Cpus_user_allowed: c0 Cpus_user_allowed_list: 6-7 Offline cpu6, and then the do_set_cpus_allowed will clear the user_ptr: ums9621_1h10:/ # echo 0 > /sys/devices/system/cpu/cpu6/online ums9621_1h10:/ # cat /proc/6786/status | grep Cpus Cpus_allowed: ff Cpus_allowed_list: 0-7 Cpus_user_allowed: (null) Cpus_user_allowed_list: (null) Bringup the core6,7: ums9621_1h10:/ # echo 1 > /sys/devices/system/cpu/cpu6/online ums9621_1h10:/ # echo 1 > /sys/devices/system/cpu/cpu7/online ums9621_1h10:/ # cat /proc/6786/status | grep Cpus Cpus_allowed: ff Cpus_allowed_list: 0-7 Cpus_user_allowed: (null) Cpus_user_allowed_list: (null) Signed-off-by: Xuewen Yan --- fs/proc/array.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/proc/array.c b/fs/proc/array.c index 34a47fb0c57f..084bee2a2e2b 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -409,6 +409,10 @@ static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) cpumask_pr_args(&task->cpus_mask)); seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", cpumask_pr_args(&task->cpus_mask)); + seq_printf(m, "Cpus_user_allowed:\t%*pb\n", + cpumask_pr_args(task->user_cpus_ptr)); + seq_printf(m, "Cpus_user_allowed_list:\t%*pbl\n", + cpumask_pr_args(task->user_cpus_ptr)); } static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)