From mboxrd@z Thu Jan 1 00:00:00 1970 From: Colin Cross Subject: [PATCH v2 05/10] epoll: use freezable blocking call Date: Wed, 1 May 2013 18:35:03 -0700 Message-ID: <1367458508-9133-6-git-send-email-ccross@android.com> References: <1367458508-9133-1-git-send-email-ccross@android.com> Cc: linux-kernel@vger.kernel.org, "Rafael J. Wysocki" , arve@android.com, Tejun Heo , Oleg Nesterov , Colin Cross , Alexander Viro , linux-fsdevel@vger.kernel.org To: linux-pm@vger.kernel.org Return-path: Received: from mail-ye0-f202.google.com ([209.85.213.202]:64586 "EHLO mail-ye0-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758861Ab3EBBfT (ORCPT ); Wed, 1 May 2013 21:35:19 -0400 Received: by mail-ye0-f202.google.com with SMTP id r13so14487yen.1 for ; Wed, 01 May 2013 18:35:18 -0700 (PDT) In-Reply-To: <1367458508-9133-1-git-send-email-ccross@android.com> Sender: linux-fsdevel-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. 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