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| author | Jinke Han <hanjinke.666@bytedance.com> | 2023-06-12 20:40:17 +0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2023-10-05 21:48:03 -0400 |
| commit | ce774e5365e46be73ed055302c6de123a03394ea (patch) | |
| tree | 4e70a6a61055202735b7b5ad9858f5e127440b6a /fs/ext4/mballoc.c | |
| parent | a8c1eb77edfc92a64788dad70fedf9277cbafe76 (diff) | |
| download | linux-stable-ce774e5365e46be73ed055302c6de123a03394ea.tar.gz linux-stable-ce774e5365e46be73ed055302c6de123a03394ea.tar.bz2 linux-stable-ce774e5365e46be73ed055302c6de123a03394ea.zip | |
ext4: make running and commit transaction have their own freed_data_list
When releasing space in jbd, we traverse s_freed_data_list to get the
free range belonging to the current commit transaction. In extreme cases,
the time spent may not be small, and we have observed cases exceeding
10ms. This patch makes running and commit transactions manage their own
free_data_list respectively, eliminating unnecessary traversal.
And in the callback phase of the commit transaction, no one will touch
it except the jbd thread itself, so s_md_lock is no longer needed.
Signed-off-by: Jinke Han <hanjinke.666@bytedance.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://lore.kernel.org/r/20230612124017.14115-1-hanjinke.666@bytedance.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 1e599305d85f..1d65c738c4c9 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -3631,7 +3631,8 @@ int ext4_mb_init(struct super_block *sb) spin_lock_init(&sbi->s_md_lock); sbi->s_mb_free_pending = 0; - INIT_LIST_HEAD(&sbi->s_freed_data_list); + INIT_LIST_HEAD(&sbi->s_freed_data_list[0]); + INIT_LIST_HEAD(&sbi->s_freed_data_list[1]); INIT_LIST_HEAD(&sbi->s_discard_list); INIT_WORK(&sbi->s_discard_work, ext4_discard_work); atomic_set(&sbi->s_retry_alloc_pending, 0); @@ -3883,19 +3884,10 @@ void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid) struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_free_data *entry, *tmp; LIST_HEAD(freed_data_list); - struct list_head *cut_pos = NULL; + struct list_head *s_freed_head = &sbi->s_freed_data_list[commit_tid & 1]; bool wake; - spin_lock(&sbi->s_md_lock); - list_for_each_entry(entry, &sbi->s_freed_data_list, efd_list) { - if (entry->efd_tid != commit_tid) - break; - cut_pos = &entry->efd_list; - } - if (cut_pos) - list_cut_position(&freed_data_list, &sbi->s_freed_data_list, - cut_pos); - spin_unlock(&sbi->s_md_lock); + list_replace_init(s_freed_head, &freed_data_list); list_for_each_entry(entry, &freed_data_list, efd_list) ext4_free_data_in_buddy(sb, entry); @@ -6378,7 +6370,7 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b, } spin_lock(&sbi->s_md_lock); - list_add_tail(&new_entry->efd_list, &sbi->s_freed_data_list); + list_add_tail(&new_entry->efd_list, &sbi->s_freed_data_list[new_entry->efd_tid & 1]); sbi->s_mb_free_pending += clusters; spin_unlock(&sbi->s_md_lock); } |