31 lines
1.0 KiB
Diff
31 lines
1.0 KiB
Diff
From: Mike Galbraith <mgalbraith@suse.de>
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Date: Wed, 11 Jul 2012 22:05:20 +0000
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Subject: fs, jbd: pull your plug when waiting for space
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.0/patches-4.0.5-rt3.tar.xz
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With an -rt kernel, and a heavy sync IO load, tasks can jam
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up on journal locks without unplugging, which can lead to
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terminal IO starvation. Unplug and schedule when waiting for space.
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Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
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Cc: Steven Rostedt <rostedt@goodmis.org>
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Cc: Theodore Tso <tytso@mit.edu>
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Link: http://lkml.kernel.org/r/1341812414.7370.73.camel@marge.simpson.net
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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fs/jbd/checkpoint.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/fs/jbd/checkpoint.c
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+++ b/fs/jbd/checkpoint.c
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@@ -129,6 +129,8 @@ void __log_wait_for_space(journal_t *jou
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if (journal->j_flags & JFS_ABORT)
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return;
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spin_unlock(&journal->j_state_lock);
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+ if (current->plug)
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+ io_schedule();
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mutex_lock(&journal->j_checkpoint_mutex);
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/*
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