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writeback: do uninterruptible sleep in balance_dirty_pages()

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Using TASK_INTERRUPTIBLE in balance_dirty_pages() seems wrong.  If it's
going to do that then it must break out if signal_pending(), otherwise
it's pretty much guaranteed to degenerate into a busywait loop.  Plus we
*do* want these processes to appear in D state and to contribute to load
average.

So it should be TASK_UNINTERRUPTIBLE.                 -- Andrew Morton

Signed-off-by: Wu Fengguang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Wu Fengguang 2010-12-21 17:24:21 -08:00 • committed by Linus Torvalds
commit d153ba6445
1 changed files with 1 additions and 1 deletions
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mm/page-writeback.c
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@ -563,7 +563,7 @@ static void balance_dirty_pages(struct address_space *mapping,
break; /* We've done our duty */
}
trace_wbc_balance_dirty_wait(&wbc, bdi);
__set_current_state(TASK_INTERRUPTIBLE);
__set_current_state(TASK_UNINTERRUPTIBLE);
io_schedule_timeout(pause);
/*