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f2fs: add unlikely() macro for compiler optimization

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As we know, some of our branch condition will rarely be true. So we could add
'unlikely' to let compiler optimize these code, by this way we could drop
unneeded 'jump' assemble code to improve performance.

change log:
 o add *unlikely* as many as possible across the whole source files at once
   suggested by Jaegeuk Kim.

Suggested-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Chao Yu 2013-12-05 17:15:22 +08:00 • committed by Jaegeuk Kim
parent b9987a277f
commit cfb271d485
6 changed files with 33 additions and 27 deletions
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2
fs/f2fs/segment.h
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@ -457,7 +457,7 @@ static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed)
int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
if (sbi->por_doing)
if (unlikely(sbi->por_doing))
return false;
return ((free_sections(sbi) + freed) <= (node_secs + 2 * dent_secs +