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| author | Mike Snitzer <snitzer@redhat.com> | 2015-07-17 03:48:55 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-07-17 04:32:08 +0200 |
| commit | 665022d72f9b5762f21b5ea02fa0503d04802849 (patch) | |
| tree | d7760993f35eac82be5f165d385b3f05fb1f4552 /drivers/md | |
| parent | dm cache: avoid preallocation if no work in writeback_some_dirty_blocks() (diff) | |
| download | linux-665022d72f9b5762f21b5ea02fa0503d04802849.tar.xz linux-665022d72f9b5762f21b5ea02fa0503d04802849.zip | |
dm cache: avoid calls to prealloc_free_structs() if possible
If no work was performed then prealloc_data_structs() wasn't ever called
so there isn't any need to call prealloc_free_structs().
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-cache-target.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c index 408dd276d6c9..b680da5d7b93 100644 --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -1946,6 +1946,7 @@ static int commit_if_needed(struct cache *cache) static void process_deferred_bios(struct cache *cache) { + bool prealloc_used = false; unsigned long flags; struct bio_list bios; struct bio *bio; @@ -1980,13 +1981,16 @@ static void process_deferred_bios(struct cache *cache) process_discard_bio(cache, &structs, bio); else process_bio(cache, &structs, bio); + prealloc_used = true; } - prealloc_free_structs(cache, &structs); + if (prealloc_used) + prealloc_free_structs(cache, &structs); } static void process_deferred_cells(struct cache *cache) { + bool prealloc_used = false; unsigned long flags; struct dm_bio_prison_cell *cell, *tmp; struct list_head cells; @@ -2014,9 +2018,11 @@ static void process_deferred_cells(struct cache *cache) } process_cell(cache, &structs, cell); + prealloc_used = true; } - prealloc_free_structs(cache, &structs); + if (prealloc_used) + prealloc_free_structs(cache, &structs); } static void process_deferred_flush_bios(struct cache *cache, bool submit_bios) @@ -2061,6 +2067,7 @@ static void process_deferred_writethrough_bios(struct cache *cache) static void writeback_some_dirty_blocks(struct cache *cache) { + bool prealloc_used = false; dm_oblock_t oblock; dm_cblock_t cblock; struct prealloc structs; @@ -2080,9 +2087,11 @@ static void writeback_some_dirty_blocks(struct cache *cache) } writeback(cache, &structs, oblock, cblock, old_ocell); + prealloc_used = true; } - prealloc_free_structs(cache, &structs); + if (prealloc_used) + prealloc_free_structs(cache, &structs); } /*---------------------------------------------------------------- |