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[209.132.183.28]) by mx.google.com with ESMTPS id o127si7092133qkd.13.2018.11.19.10.57.47 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 19 Nov 2018 10:57:47 -0800 (PST) Received-SPF: pass (google.com: domain of longman@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of longman@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=longman@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E2AED58E5A; Mon, 19 Nov 2018 18:57:46 +0000 (UTC) Received: from llong.com (dhcp-17-55.bos.redhat.com [10.18.17.55]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4B0726090A; Mon, 19 Nov 2018 18:57:45 +0000 (UTC) From: Waiman Long To: Peter Zijlstra , Ingo Molnar , Will Deacon , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Petr Mladek , Sergey Senozhatsky , Andrey Ryabinin , Tejun Heo , Andrew Morton , Waiman Long Subject: [PATCH v2 16/17] delay_acct: Mark task's delays->lock as terminal spinlock Date: Mon, 19 Nov 2018 13:55:25 -0500 Message-Id: <1542653726-5655-17-git-send-email-longman@redhat.com> In-Reply-To: <1542653726-5655-1-git-send-email-longman@redhat.com> References: <1542653726-5655-1-git-send-email-longman@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Mon, 19 Nov 2018 18:57:47 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP By making task's delays->lock a terminal spinlock, it reduces the lockdep overhead when this lock is used. Signed-off-by: Waiman Long --- kernel/delayacct.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/delayacct.c b/kernel/delayacct.c index 2a12b98..49dd8d3 100644 --- a/kernel/delayacct.c +++ b/kernel/delayacct.c @@ -43,8 +43,10 @@ void delayacct_init(void) void __delayacct_tsk_init(struct task_struct *tsk) { tsk->delays = kmem_cache_zalloc(delayacct_cache, GFP_KERNEL); - if (tsk->delays) + if (tsk->delays) { raw_spin_lock_init(&tsk->delays->lock); + lockdep_set_terminal_class(&tsk->delays->lock); + } } /*