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ext4: yield during large unlinks

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During large unlink operations on files with extents, we can use a lot
of CPU time.  This adds a cond_resched() call when starting to examine
the next level of a multi-level extent tree.  Multi-level extent trees
are rare in the first place, and this should rarely be executed.
    
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2013-07-15 12:27:47 -04:00
commit 76828c8826
1 changed files with 3 additions and 0 deletions
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3
fs/ext4/extents.c
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@ -2835,6 +2835,9 @@ again:
err = -EIO;
break;
}
/* Yield here to deal with large extent trees.
* Should be a no-op if we did IO above. */
cond_resched();
if (WARN_ON(i + 1 > depth)) {
err = -EIO;
break;