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authorDave Chinner <dchinner@redhat.com>2011-07-08 14:14:45 +1000
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-20 20:47:41 -0400
commit8ab47664d51a69ea79fe70bb07ca80664f74f76b (patch)
treea0cc73a909840edfb23b4b4490c39fd222cce0fa /fs/super.c
parent0e1fdafd93980eac62e778798549ce0f6073905c (diff)
vfs: increase shrinker batch size
Now that the per-sb shrinker is responsible for shrinking 2 or more caches, increase the batch size to keep econmies of scale for shrinking each cache. Increase the shrinker batch size to 1024 objects. To allow for a large increase in batch size, add a conditional reschedule to prune_icache_sb() so that we don't hold the LRU spin lock for too long. This mirrors the behaviour of the __shrink_dcache_sb(), and allows us to increase the batch size without needing to worry about problems caused by long lock hold times. To ensure that filesystems using the per-sb shrinker callouts don't cause problems, document that the object freeing method must reschedule appropriately inside loops. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/super.c')
-rw-r--r--fs/super.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c
index 5101f0544960..7943f04cb3a9 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -182,6 +182,7 @@ static struct super_block *alloc_super(struct file_system_type *type)
s->s_shrink.seeks = DEFAULT_SEEKS;
s->s_shrink.shrink = prune_super;
+ s->s_shrink.batch = 1024;
}
out:
return s;