Messages in this thread Patch in this message | | | Date | Wed, 11 Jul 2012 22:05:20 -0000 | From | Thomas Gleixner <> | Subject | [patch RT 6/7] fs, jbd: pull your plug when waiting for space |
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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 <mgalbraith@suse.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Theodore Tso <tytso@mit.edu> Link: http://lkml.kernel.org/r/1341812414.7370.73.camel@marge.simpson.net Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- fs/jbd/checkpoint.c | 2 ++ 1 file changed, 2 insertions(+)
Index: linux-stable-rt/fs/jbd/checkpoint.c =================================================================== --- linux-stable-rt.orig/fs/jbd/checkpoint.c +++ linux-stable-rt/fs/jbd/checkpoint.c @@ -129,6 +129,8 @@ void __log_wait_for_space(journal_t *jou if (journal->j_flags & JFS_ABORT) return; spin_unlock(&journal->j_state_lock); + if (current->plug) + io_schedule(); mutex_lock(&journal->j_checkpoint_mutex); /*
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