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f2fs: add unlikely() macro for compiler more aggressively 

This patch adds unlikely() macro into the most of codes.
The basic rule is to add that when:
- checking unusual errors,
- checking page mappings,
- and the other unlikely conditions.

Change log from v1:
 - Don't add unlikely for the NULL test and error test: advised by Andi Kleen.

Cc: Chao Yu <chao2.yu@samsung.com>
Cc: Andi Kleen <andi@firstfloor.org>
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-12-06 15:00:58 +09:00
parent cfb271d485
commit 6bacf52fb5
8 changed files with 47 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/f2fs/checkpoint.c
View File

@ -66,7 +66,7 @@ repeat:
goto repeat;
lock_page(page);
if (page->mapping != mapping) {
if (unlikely(page->mapping != mapping)) {
f2fs_put_page(page, 1);
goto repeat;
}
@ -473,7 +473,7 @@ static int __add_dirty_inode(struct inode *inode, struct dir_inode_entry *new)
list_for_each(this, head) {
struct dir_inode_entry *entry;
entry = list_entry(this, struct dir_inode_entry, list);
if (entry->inode == inode)
if (unlikely(entry->inode == inode))
return -EEXIST;
}
list_add_tail(&new->list, head);
@ -783,7 +783,7 @@ static void do_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
/* Here, we only have one bio having CP pack */
sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
if (!is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
if (unlikely(!is_set_ckpt_flags(ckpt, CP_ERROR_FLAG))) {
clear_prefree_segments(sbi);
F2FS_RESET_SB_DIRT(sbi);
}
@ -840,11 +840,11 @@ int __init create_checkpoint_caches(void)
{
orphan_entry_slab = f2fs_kmem_cache_create("f2fs_orphan_entry",
sizeof(struct orphan_inode_entry), NULL);
if (unlikely(!orphan_entry_slab))
if (!orphan_entry_slab)
return -ENOMEM;
inode_entry_slab = f2fs_kmem_cache_create("f2fs_dirty_dir_entry",
sizeof(struct dir_inode_entry), NULL);
if (unlikely(!inode_entry_slab)) {
if (!inode_entry_slab) {
kmem_cache_destroy(orphan_entry_slab);
return -ENOMEM;
}

29
fs/f2fs/data.c
View File

@ -49,11 +49,11 @@ static void f2fs_read_end_io(struct bio *bio, int err)
if (--bvec >= bio->bi_io_vec)
prefetchw(&bvec->bv_page->flags);
if (uptodate) {
SetPageUptodate(page);
} else {
if (unlikely(!uptodate)) {
ClearPageUptodate(page);
SetPageError(page);
} else {
SetPageUptodate(page);
}
unlock_page(page);
} while (bvec >= bio->bi_io_vec);
@ -73,7 +73,7 @@ static void f2fs_write_end_io(struct bio *bio, int err)
if (--bvec >= bio->bi_io_vec)
prefetchw(&bvec->bv_page->flags);
if (!uptodate) {
if (unlikely(!uptodate)) {
SetPageError(page);
set_bit(AS_EIO, &page->mapping->flags);
set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
@ -249,7 +249,7 @@ int reserve_new_block(struct dnode_of_data *dn)
{
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))
if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
return -EPERM;
if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
return -ENOSPC;
@ -424,7 +424,7 @@ struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync)
return ERR_PTR(-ENOENT);
/* By fallocate(), there is no cached page, but with NEW_ADDR */
if (dn.data_blkaddr == NEW_ADDR)
if (unlikely(dn.data_blkaddr == NEW_ADDR))
return ERR_PTR(-EINVAL);
page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS);
@ -443,7 +443,7 @@ struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync)
if (sync) {
wait_on_page_locked(page);
if (!PageUptodate(page)) {
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 0);
return ERR_PTR(-EIO);
}
@ -477,7 +477,7 @@ repeat:
}
f2fs_put_dnode(&dn);
if (dn.data_blkaddr == NULL_ADDR) {
if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
f2fs_put_page(page, 1);
return ERR_PTR(-ENOENT);
}
@ -502,11 +502,11 @@ repeat:
return ERR_PTR(err);
lock_page(page);
if (!PageUptodate(page)) {
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
if (page->mapping != mapping) {
if (unlikely(page->mapping != mapping)) {
f2fs_put_page(page, 1);
goto repeat;
}
@ -534,7 +534,6 @@ struct page *get_new_data_page(struct inode *inode,
err = f2fs_reserve_block(&dn, index);
if (err)
return ERR_PTR(err);
repeat:
page = grab_cache_page(mapping, index);
if (!page)
@ -552,11 +551,11 @@ repeat:
if (err)
return ERR_PTR(err);
lock_page(page);
if (!PageUptodate(page)) {
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
if (page->mapping != mapping) {
if (unlikely(page->mapping != mapping)) {
f2fs_put_page(page, 1);
goto repeat;
}
@ -841,11 +840,11 @@ repeat:
if (err)
return err;
lock_page(page);
if (!PageUptodate(page)) {
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1);
return -EIO;
}
if (page->mapping != mapping) {
if (unlikely(page->mapping != mapping)) {
f2fs_put_page(page, 1);
goto repeat;
}

9
fs/f2fs/file.c
View File

@ -50,9 +50,9 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
file_update_time(vma->vm_file);
lock_page(page);
if (page->mapping != inode->i_mapping ||
if (unlikely(page->mapping != inode->i_mapping ||
page_offset(page) > i_size_read(inode) ||
!PageUptodate(page)) {
!PageUptodate(page))) {
unlock_page(page);
err = -EFAULT;
goto out;
@ -120,7 +120,7 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
.for_reclaim = 0,
};
if (f2fs_readonly(inode->i_sb))
if (unlikely(f2fs_readonly(inode->i_sb)))
return 0;
trace_f2fs_sync_file_enter(inode);
@ -241,7 +241,7 @@ static void truncate_partial_data_page(struct inode *inode, u64 from)
return;
lock_page(page);
if (page->mapping != inode->i_mapping) {
if (unlikely(page->mapping != inode->i_mapping)) {
f2fs_put_page(page, 1);
return;
}
@ -516,7 +516,6 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
if (ret)
break;
if (pg_start == pg_end)
new_size = offset + len;
else if (index == pg_start && off_start)

3
fs/f2fs/gc.c
View File

@ -119,7 +119,6 @@ int start_gc_thread(struct f2fs_sb_info *sbi)
kfree(gc_th);
sbi->gc_thread = NULL;
}
out:
return err;
}
@ -695,7 +694,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi)
INIT_LIST_HEAD(&ilist);
gc_more:
if (!(sbi->sb->s_flags & MS_ACTIVE))
if (unlikely(!(sbi->sb->s_flags & MS_ACTIVE)))
goto stop;
if (gc_type == BG_GC && has_not_enough_free_secs(sbi, nfree)) {

28
fs/f2fs/node.c
View File

@ -750,7 +750,7 @@ skip_partial:
if (offset[1] == 0 &&
rn->i.i_nid[offset[0] - NODE_DIR1_BLOCK]) {
lock_page(page);
if (page->mapping != node_mapping) {
if (unlikely(page->mapping != node_mapping)) {
f2fs_put_page(page, 1);
goto restart;
}
@ -841,14 +841,14 @@ struct page *new_node_page(struct dnode_of_data *dn,
struct page *page;
int err;
if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))
if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
return ERR_PTR(-EPERM);
page = grab_cache_page(mapping, dn->nid);
if (!page)
return ERR_PTR(-ENOMEM);
if (!inc_valid_node_count(sbi, dn->inode)) {
if (unlikely(!inc_valid_node_count(sbi, dn->inode))) {
err = -ENOSPC;
goto fail;
}
@ -898,7 +898,7 @@ static int read_node_page(struct page *page, int rw)
get_node_info(sbi, page->index, &ni);
if (ni.blk_addr == NULL_ADDR) {
if (unlikely(ni.blk_addr == NULL_ADDR)) {
f2fs_put_page(page, 1);
return -ENOENT;
}
@ -953,11 +953,11 @@ repeat:
goto got_it;
lock_page(page);
if (!PageUptodate(page)) {
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
if (page->mapping != mapping) {
if (unlikely(page->mapping != mapping)) {
f2fs_put_page(page, 1);
goto repeat;
}
@ -1010,12 +1010,12 @@ repeat:
blk_finish_plug(&plug);
lock_page(page);
if (page->mapping != mapping) {
if (unlikely(page->mapping != mapping)) {
f2fs_put_page(page, 1);
goto repeat;
}
page_hit:
if (!PageUptodate(page)) {
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
@ -1173,9 +1173,9 @@ int wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
cond_resched();
}
if (test_and_clear_bit(AS_ENOSPC, &mapping->flags))
if (unlikely(test_and_clear_bit(AS_ENOSPC, &mapping->flags)))
ret2 = -ENOSPC;
if (test_and_clear_bit(AS_EIO, &mapping->flags))
if (unlikely(test_and_clear_bit(AS_EIO, &mapping->flags)))
ret2 = -EIO;
if (!ret)
ret = ret2;
@ -1202,7 +1202,7 @@ static int f2fs_write_node_page(struct page *page,
get_node_info(sbi, nid, &ni);
/* This page is already truncated */
if (ni.blk_addr == NULL_ADDR) {
if (unlikely(ni.blk_addr == NULL_ADDR)) {
dec_page_count(sbi, F2FS_DIRTY_NODES);
unlock_page(page);
return 0;
@ -1627,14 +1627,14 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
list_for_each_entry_safe(page, tmp, &page_list, lru) {
lock_page(page);
if(PageUptodate(page)) {
if (unlikely(!PageUptodate(page))) {
err = -EIO;
} else {
rn = F2FS_NODE(page);
sum_entry->nid = rn->footer.nid;
sum_entry->version = 0;
sum_entry->ofs_in_node = 0;
sum_entry++;
} else {
err = -EIO;
}
list_del(&page->lru);

2
fs/f2fs/recovery.c
View File

@ -430,7 +430,7 @@ int recover_fsync_data(struct f2fs_sb_info *sbi)
fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
sizeof(struct fsync_inode_entry), NULL);
if (unlikely(!fsync_entry_slab))
if (!fsync_entry_slab)
return -ENOMEM;
INIT_LIST_HEAD(&inode_list);

14
fs/f2fs/super.c
View File

@ -626,7 +626,7 @@ static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
struct f2fs_sb_info *sbi = F2FS_SB(sb);
struct inode *inode;
if (ino < F2FS_ROOT_INO(sbi))
if (unlikely(ino < F2FS_ROOT_INO(sbi)))
return ERR_PTR(-ESTALE);
/*
@ -637,7 +637,7 @@ static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
inode = f2fs_iget(sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
if (unlikely(generation && inode->i_generation != generation)) {
/* we didn't find the right inode.. */
iput(inode);
return ERR_PTR(-ESTALE);
@ -740,10 +740,10 @@ static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
if (fsmeta >= total)
if (unlikely(fsmeta >= total))
return 1;
if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
if (unlikely(is_set_ckpt_flags(ckpt, CP_ERROR_FLAG))) {
f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
return 1;
}
@ -808,7 +808,7 @@ retry:
brelse(*raw_super_buf);
f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
"in %dth superblock", block + 1);
if(block == 0) {
if (block == 0) {
block++;
goto retry;
} else {
@ -834,7 +834,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
return -ENOMEM;
/* set a block size */
if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
goto free_sbi;
}
@ -1066,7 +1066,7 @@ static int __init init_inodecache(void)
{
f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
sizeof(struct f2fs_inode_info), NULL);
if (f2fs_inode_cachep == NULL)
if (!f2fs_inode_cachep)
return -ENOMEM;
return 0;
}

2
fs/f2fs/xattr.c
View File

@ -522,7 +522,7 @@ static int __f2fs_setxattr(struct inode *inode, int name_index,
if (found)
free = free + ENTRY_SIZE(here);
if (free < newsize) {
if (unlikely(free < newsize)) {
error = -ENOSPC;
goto exit;
}