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authorDavid Sterba <dsterba@suse.cz>2015-01-14 21:52:13 +0300
committerChris Mason <clm@fb.com>2015-01-22 05:02:04 +0300
commit9ee49a047dc53fd21808cbb7f3b6a3345463e834 (patch)
tree98710aa584c84501c00ecf2227138ff4f44d5396 /fs/btrfs/tests
parent5efa0490cc94aee06cd8d282683e22a8ce0a0026 (diff)
downloadlinux-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.c3
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);