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| author | David Sterba <dsterba@suse.cz> | 2015-01-14 21:52:13 +0300 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2015-01-22 05:02:04 +0300 |
| commit | 9ee49a047dc53fd21808cbb7f3b6a3345463e834 (patch) | |
| tree | 98710aa584c84501c00ecf2227138ff4f44d5396 /fs/btrfs/tests | |
| parent | 5efa0490cc94aee06cd8d282683e22a8ce0a0026 (diff) | |
| download | linux-9ee49a047dc53fd21808cbb7f3b6a3345463e834.tar.xz | |
btrfs: switch extent_state state to unsigned
Currently there's a 4B hole in the structure between refs and state and there
are only 16 bits used so we can make it unsigned. This will get a better
packing and may save some stack space for local variables.
The size of extent_state gets reduced by 8B and there are usually a lot
of slab objects.
struct extent_state {
u64 start; /* 0 8 */
u64 end; /* 8 8 */
struct rb_node rb_node; /* 16 24 */
wait_queue_head_t wq; /* 40 24 */
/* --- cacheline 1 boundary (64 bytes) --- */
atomic_t refs; /* 64 4 */
/* XXX 4 bytes hole, try to pack */
long unsigned int state; /* 72 8 */
u64 private; /* 80 8 */
/* size: 88, cachelines: 2, members: 7 */
/* sum members: 84, holes: 1, sum holes: 4 */
/* last cacheline: 24 bytes */
};
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/tests')
| -rw-r--r-- | fs/btrfs/tests/extent-io-tests.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/btrfs/tests/extent-io-tests.c b/fs/btrfs/tests/extent-io-tests.c index 7e99c2f98dd0..9e9f2368177d 100644 --- a/fs/btrfs/tests/extent-io-tests.c +++ b/fs/btrfs/tests/extent-io-tests.c @@ -258,8 +258,7 @@ static int test_find_delalloc(void) } ret = 0; out_bits: - clear_extent_bits(&tmp, 0, total_dirty - 1, - (unsigned long)-1, GFP_NOFS); + clear_extent_bits(&tmp, 0, total_dirty - 1, (unsigned)-1, GFP_NOFS); out: if (locked_page) page_cache_release(locked_page); |