From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Rostedt Subject: [PATCH RT 6/8] fs, jbd: pull your plug when waiting for space Date: Thu, 12 Jul 2012 19:18:33 -0400 Message-ID: <20120712231956.965653507@goodmis.org> References: <20120712231827.084920483@goodmis.org> Cc: Thomas Gleixner , Carsten Emde , John Kacur , Mike Galbraith , Theodore Tso To: linux-kernel@vger.kernel.org, linux-rt-users Return-path: Content-Disposition: inline; filename=0006-fs-jbd-pull-your-plug-when-waiting-for-space.patch Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.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 5c93ffc..ddbd223 100644 --- a/fs/jbd/checkpoint.c +++ b/fs/jbd/checkpoint.c @@ -129,6 +129,8 @@ 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