invalidate_mapping_pages(): add cond_resched
invalidate_mapping_pages() can sometimes take a long time (millions of pages
to free). Long enough for the softlockup detector to trigger.
We used to have a cond_resched() in there but I took it out because the
drop_caches code calls invalidate_mapping_pages() under inode_lock.
The patch adds a nasty flag and puts the cond_resched() back.
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 03ea769..59375ef 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -20,7 +20,7 @@
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
if (inode->i_state & (I_FREEING|I_WILL_FREE))
continue;
- invalidate_mapping_pages(inode->i_mapping, 0, -1);
+ __invalidate_mapping_pages(inode->i_mapping, 0, -1, true);
}
spin_unlock(&inode_lock);
}
