From e782eff591bca2d96bac30ab5d1cfa4ccd3b0f86 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Thu, 16 Jul 2015 21:26:10 -0400 Subject: dm cache: avoid preallocation if no work in writeback_some_dirty_blocks() Refactor writeback_some_dirty_blocks() to avoid prealloc_data_structs() if the policy doesn't have any dirty blocks ready for writeback. Signed-off-by: Mike Snitzer --- drivers/md/dm-cache-target.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) (limited to 'drivers/md') diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c index c8a160b37412..408dd276d6c9 100644 --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -2061,7 +2061,6 @@ static void process_deferred_writethrough_bios(struct cache *cache) static void writeback_some_dirty_blocks(struct cache *cache) { - int r = 0; dm_oblock_t oblock; dm_cblock_t cblock; struct prealloc structs; @@ -2071,15 +2070,11 @@ static void writeback_some_dirty_blocks(struct cache *cache) memset(&structs, 0, sizeof(structs)); while (spare_migration_bandwidth(cache)) { - if (prealloc_data_structs(cache, &structs)) - break; - - r = policy_writeback_work(cache->policy, &oblock, &cblock, busy); - if (r) - break; + if (policy_writeback_work(cache->policy, &oblock, &cblock, busy)) + break; /* no work to do */ - r = get_cell(cache, oblock, &structs, &old_ocell); - if (r) { + if (prealloc_data_structs(cache, &structs) || + get_cell(cache, oblock, &structs, &old_ocell)) { policy_set_dirty(cache->policy, oblock); break; } -- cgit v1.2.3-59-g8ed1b