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ext4: reduce mballoc stack usage with noinline_for_stack

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mballoc.c is a whole lot of static functions, which gcc seems to
really like to inline.

With the changes below, on x86, I can at least get from:

432 ext4_mb_new_blocks
240 ext4_mb_free_blocks
208 ext4_mb_discard_group_preallocations
188 ext4_mb_seq_groups_show
164 ext4_mb_init_cache
152 ext4_mb_release_inode_pa
136 ext4_mb_seq_history_show
...

to

220 ext4_mb_free_blocks
188 ext4_mb_seq_groups_show
176 ext4_mb_regular_allocator
164 ext4_mb_init_cache
156 ext4_mb_new_blocks
152 ext4_mb_release_inode_pa
136 ext4_mb_seq_history_show
124 ext4_mb_release_group_pa
...

which still has some big functions in there, but not 432 bytes!

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Eric Sandeen 2008-04-29 08:11:12 -04:00 committed by Theodore Ts'o
parent 5cdd7b2d77
commit 4ddfef7b41
1 changed files with 29 additions and 16 deletions
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45
fs/ext4/mballoc.c
View File

@ -1168,8 +1168,9 @@ out:
return err;
}
static int ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
struct ext4_buddy *e4b)
static noinline_for_stack int
ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
struct ext4_buddy *e4b)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct inode *inode = sbi->s_buddy_cache;
@ -1965,7 +1966,8 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac,
return 0;
}
static int ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
static noinline_for_stack int
ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
{
ext4_group_t group;
ext4_group_t i;
@ -2465,7 +2467,8 @@ static void ext4_mb_history_init(struct super_block *sb)
/* if we can't allocate history, then we simple won't use it */
}
static void ext4_mb_store_history(struct ext4_allocation_context *ac)
static noinline_for_stack void
ext4_mb_store_history(struct ext4_allocation_context *ac)
{
struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
struct ext4_mb_history h;
@ -2801,7 +2804,8 @@ int ext4_mb_release(struct super_block *sb)
return 0;
}
static void ext4_mb_free_committed_blocks(struct super_block *sb)
static noinline_for_stack void
ext4_mb_free_committed_blocks(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
int err;
@ -3021,7 +3025,8 @@ void exit_ext4_mballoc(void)
* Check quota and mark choosed space (ac->ac_b_ex) non-free in bitmaps
* Returns 0 if success or error code
*/
static int ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
static noinline_for_stack int
ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
handle_t *handle)
{
struct buffer_head *bitmap_bh = NULL;
@ -3138,7 +3143,8 @@ static void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac)
* Normalization means making request better in terms of
* size and alignment
*/
static void ext4_mb_normalize_request(struct ext4_allocation_context *ac,
static noinline_for_stack void
ext4_mb_normalize_request(struct ext4_allocation_context *ac,
struct ext4_allocation_request *ar)
{
int bsbits, max;
@ -3404,7 +3410,8 @@ static void ext4_mb_use_group_pa(struct ext4_allocation_context *ac,
/*
* search goal blocks in preallocated space
*/
static int ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
static noinline_for_stack int
ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
{
struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
struct ext4_locality_group *lg;
@ -3571,7 +3578,8 @@ static void ext4_mb_put_pa(struct ext4_allocation_context *ac,
/*
* creates new preallocated space for given inode
*/
static int ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
static noinline_for_stack int
ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
{
struct super_block *sb = ac->ac_sb;
struct ext4_prealloc_space *pa;
@ -3658,7 +3666,8 @@ static int ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
/*
* creates new preallocated space for locality group inodes belongs to
*/
static int ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
static noinline_for_stack int
ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
{
struct super_block *sb = ac->ac_sb;
struct ext4_locality_group *lg;
@ -3731,8 +3740,8 @@ static int ext4_mb_new_preallocation(struct ext4_allocation_context *ac)
* the caller MUST hold group/inode locks.
* TODO: optimize the case when there are no in-core structures yet
*/
static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
struct buffer_head *bitmap_bh,
static noinline_for_stack int
ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
struct ext4_prealloc_space *pa)
{
struct ext4_allocation_context *ac;
@ -3803,7 +3812,8 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
return err;
}
static int ext4_mb_release_group_pa(struct ext4_buddy *e4b,
static noinline_for_stack int
ext4_mb_release_group_pa(struct ext4_buddy *e4b,
struct ext4_prealloc_space *pa)
{
struct ext4_allocation_context *ac;
@ -3845,7 +3855,8 @@ static int ext4_mb_release_group_pa(struct ext4_buddy *e4b,
* - how many do we discard
* 1) how many requested
*/
static int ext4_mb_discard_group_preallocations(struct super_block *sb,
static noinline_for_stack int
ext4_mb_discard_group_preallocations(struct super_block *sb,
ext4_group_t group, int needed)
{
struct ext4_group_info *grp = ext4_get_group_info(sb, group);
@ -4167,7 +4178,8 @@ static void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
mutex_lock(&ac->ac_lg->lg_mutex);
}
static int ext4_mb_initialize_context(struct ext4_allocation_context *ac,
static noinline_for_stack int
ext4_mb_initialize_context(struct ext4_allocation_context *ac,
struct ext4_allocation_request *ar)
{
struct super_block *sb = ar->inode->i_sb;
@ -4398,7 +4410,8 @@ static void ext4_mb_poll_new_transaction(struct super_block *sb,
ext4_mb_free_committed_blocks(sb);
}
static int ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
static noinline_for_stack int
ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
ext4_group_t group, ext4_grpblk_t block, int count)
{
struct ext4_group_info *db = e4b->bd_info;