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 <mgalbra...@suse.de> Cc: Steven Rostedt <rost...@goodmis.org> Cc: Theodore Tso <ty...@mit.edu> Link: http://lkml.kernel.org/r/1341812414.7370.73.ca...@marge.simpson.net Signed-off-by: Thomas Gleixner <t...@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); /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
