From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756031Ab2GRWlp (ORCPT ); Wed, 18 Jul 2012 18:41:45 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:15395 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754704Ab2GRWkB (ORCPT ); Wed, 18 Jul 2012 18:40:01 -0400 X-Authority-Analysis: v=2.0 cv=IOWA+3TG c=1 sm=0 a=s5Htg7xnQOKvHEu9STBOug==:17 a=OpT9cpI26MMA:10 a=Ciwy3NGCPMMA:10 a=jPHEB6S5TygA:10 a=5SG0PmZfjMsA:10 a=bbbx4UPp9XUA:10 a=meVymXHHAAAA:8 a=VwQbUJbxAAAA:8 a=4M0vJZQeAAAA:8 a=aJbRli_dN-S8RPQDehkA:9 a=0kPLrQdw3YYA:10 a=jeBq3FmKZ4MA:10 a=Zh68SRI7RUMA:10 a=s5Htg7xnQOKvHEu9STBOug==:117 X-Cloudmark-Score: 0 X-Originating-IP: 72.230.195.127 Message-Id: <20120718223958.180273825@goodmis.org> User-Agent: quilt/0.60-1 Date: Wed, 18 Jul 2012 18:39:16 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, linux-rt-users Cc: Thomas Gleixner , Carsten Emde , John Kacur , Mike Galbraith , Theodore Tso Subject: [PATCH RT 06/12] fs, jbd: pull your plug when waiting for space References: <20120718223910.898476857@goodmis.org> Content-Disposition: inline; filename=0006-fs-jbd-pull-your-plug-when-waiting-for-space.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mike Galbraith With an -rt kernel, and a heavy sync IO load, tasks can jam up on journal locks without unplugging, which can lead to terminal IO starvation. Unplug and schedule when waiting for space. Signed-off-by: Mike Galbraith Cc: Steven Rostedt Cc: Theodore Tso Link: http://lkml.kernel.org/r/1341812414.7370.73.camel@marge.simpson.net Signed-off-by: Thomas Gleixner Signed-off-by: Steven Rostedt --- fs/jbd/checkpoint.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/jbd/checkpoint.c b/fs/jbd/checkpoint.c index e4b87bc..e24b2d5 100644 --- a/fs/jbd/checkpoint.c +++ b/fs/jbd/checkpoint.c @@ -123,6 +123,8 @@ void __log_wait_for_space(journal_t *journal) if (journal->j_flags & JFS_ABORT) return; spin_unlock(&journal->j_state_lock); + if (current->plug) + io_schedule(); mutex_lock(&journal->j_checkpoint_mutex); /* -- 1.7.10.4