Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-gg0-f201.google.com ([209.85.161.201]:38013 "EHLO mail-gg0-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757771Ab3EFX5j (ORCPT ); Mon, 6 May 2013 19:57:39 -0400 Received: by mail-gg0-f201.google.com with SMTP id k25so425605ggl.0 for ; Mon, 06 May 2013 16:57:38 -0700 (PDT) From: Colin Cross To: linux-kernel@vger.kernel.org Cc: Pavel Machek , "Rafael J. Wysocki" , Peter Zijlstra , Ingo Molnar , Andrew Morton , Mandeep Singh Baines , Colin Cross , Oleg Nesterov , linux-nfs@vger.kernel.org, linux-pm@vger.kernel.org, netdev@vger.kernel.org, Linus Torvalds , Tejun Heo , Alexander Viro , linux-fsdevel@vger.kernel.org Subject: [PATCH v3 11/16] epoll: use freezable blocking call Date: Mon, 6 May 2013 16:50:16 -0700 Message-Id: <1367884221-20462-12-git-send-email-ccross@android.com> In-Reply-To: <1367884221-20462-1-git-send-email-ccross@android.com> References: <1367884221-20462-1-git-send-email-ccross@android.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Avoid waking up every thread sleeping in an epoll_wait call during suspend and resume by calling a freezable blocking call. Previous patches modified the freezer to avoid sending wakeups to threads that are blocked in freezable blocking calls. This call was selected to be converted to a freezable call because it doesn't hold any locks or release any resources when interrupted that might be needed by another freezing task or a kernel driver during suspend, and is a common site where idle userspace tasks are blocked. Acked-by: Tejun Heo Signed-off-by: Colin Cross --- fs/eventpoll.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 9fec183..65245e7 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include #include @@ -1543,7 +1544,8 @@ fetch_events: } spin_unlock_irqrestore(&ep->lock, flags); - if (!schedule_hrtimeout_range(to, slack, HRTIMER_MODE_ABS)) + if (!freezable_schedule_hrtimeout_range(to, slack, + HRTIMER_MODE_ABS)) timed_out = 1; spin_lock_irqsave(&ep->lock, flags); -- 1.8.2.1