From mboxrd@z Thu Jan 1 00:00:00 1970 From: Colin Cross Subject: [PATCH v2 07/10] futex: use freezable blocking call Date: Wed, 1 May 2013 18:35:05 -0700 Message-ID: <1367458508-9133-8-git-send-email-ccross@android.com> References: <1367458508-9133-1-git-send-email-ccross@android.com> Return-path: Received: from mail-gg0-f201.google.com ([209.85.161.201]:50247 "EHLO mail-gg0-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758912Ab3EBBfV (ORCPT ); Wed, 1 May 2013 21:35:21 -0400 Received: by mail-gg0-f201.google.com with SMTP id k25so14310ggl.2 for ; Wed, 01 May 2013 18:35:20 -0700 (PDT) In-Reply-To: <1367458508-9133-1-git-send-email-ccross@android.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, "Rafael J. Wysocki" , arve@android.com, Tejun Heo , Oleg Nesterov , Colin Cross , Darren Hart , Thomas Gleixner , Andrew Morton , Randy Dunlap , Al Viro Avoid waking up every thread sleeping in a futex_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 --- kernel/futex.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/futex.c b/kernel/futex.c index b26dcfc..d710fae 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -61,6 +61,7 @@ #include #include #include +#include #include @@ -1807,7 +1808,7 @@ static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q, * is no timeout, or if it has yet to expire. */ if (!timeout || timeout->task) - schedule(); + freezable_schedule(); } __set_current_state(TASK_RUNNING); } -- 1.8.2.1