ext4: reduce mballoc stack usage with noinline_for_stack
authorEric Sandeen <sandeen@redhat.com>
Tue, 29 Apr 2008 12:11:12 +0000 (08:11 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Tue, 29 Apr 2008 12:11:12 +0000 (08:11 -0400)
commit4ddfef7b41aebbbede73f361cb938800ba3072dc
treec4d0b722424220a02af393b7be7298e456ba4954
parent5cdd7b2d7716a7ed7d6dc7588e2d015f04d46640
ext4: reduce mballoc stack usage with noinline_for_stack

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>
fs/ext4/mballoc.c