From 04f17c802f447e76d13ade5bb78fbbf34baef0f8 Mon Sep 17 00:00:00 2001 From: Joe Thornber Date: Fri, 9 Aug 2013 12:59:30 +0100 Subject: dm btree: prefetch child nodes when walking tree for a dm_btree_del dm-btree now takes advantage of dm-bufio's ability to prefetch data via dm_bm_prefetch(). Prior to this change many btree node visits were causing a synchronous read. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon --- drivers/md/persistent-data/dm-block-manager.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/md/persistent-data/dm-block-manager.h') diff --git a/drivers/md/persistent-data/dm-block-manager.h b/drivers/md/persistent-data/dm-block-manager.h index be5bff6..9a82083 100644 --- a/drivers/md/persistent-data/dm-block-manager.h +++ b/drivers/md/persistent-data/dm-block-manager.h @@ -108,6 +108,11 @@ int dm_bm_unlock(struct dm_block *b); int dm_bm_flush_and_unlock(struct dm_block_manager *bm, struct dm_block *superblock); + /* + * Request data be prefetched into the cache. + */ +void dm_bm_prefetch(struct dm_block_manager *bm, dm_block_t b); + /* * Switches the bm to a read only mode. Once read-only mode * has been entered the following functions will return -EPERM. -- cgit v1.1