Commit 76828c88 authored Jul 15, 2013 by Theodore Ts'o

ext4: yield during large unlinks

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>

parent e15f742c

fs/ext4/extents.c

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -2835,6 +2835,9 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
	err = -EIO;		err = -EIO;
	break;		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)) {		if (WARN_ON(i + 1 > depth)) {
	err = -EIO;		err = -EIO;
	break;		break;