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@xxxxxxx>
---
fs/ext4/extents.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 3d99b18..cc4731fd 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2861,6 +2861,9 @@ again:
err = PTR_ERR(bh);
break;
}
+ /* Yield here to deal with large extent trees. Should be
+ * a no-op if we did IO for the above sb_bread. */
+ cond_resched();
if (WARN_ON(i + 1 > depth)) {
err = -EIO;
break;
--
1.7.12.rc0.22.gcdd159b
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