diff options
| author | Daeho Jeong <daeho.jeong@samsung.com> | 2017-06-22 23:54:33 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-06-22 23:54:33 -0400 |
| commit | a015434480dcdbfdc188df9b3633348af745e1b1 (patch) | |
| tree | db953f73e1f659b9235730b92f1561723d2325bb /fs/ext4/ext4.h | |
| parent | 3abb1a0fc2871f2db52199e1748a1d48a54a3427 (diff) | |
| download | linux-0-day-a015434480dcdbfdc188df9b3633348af745e1b1.tar.gz linux-0-day-a015434480dcdbfdc188df9b3633348af745e1b1.tar.xz | |
ext4: send parallel discards on commit completions
Now, when we mount ext4 filesystem with '-o discard' option, we have to
issue all the discard commands for the blocks to be deallocated and
wait for the completion of the commands on the commit complete phase.
Because this procedure might involve a lot of sequential combinations of
issuing discard commands and waiting for that, the delay of this
procedure might be too much long, even to 17.0s in our test,
and it results in long commit delay and fsync() performance degradation.
To reduce this kind of delay, instead of adding callback for each
extent and handling all of them in a sequential manner on commit phase,
we instead add a separate list of extents to free to the superblock and
then process this list at once after transaction commits so that
we can issue all the discard commands in a parallel manner like XFS
filesystem.
Finally, we could enhance the discard command handling performance.
The result was such that 17.0s delay of a single commit in the worst
case has been enhanced to 4.8s.
Signed-off-by: Daeho Jeong <daeho.jeong@samsung.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Tested-by: Hobin Woo <hobin.woo@samsung.com>
Tested-by: Kitae Lee <kitae87.lee@samsung.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 68ddd24db9a23..9ebde0cd632e7 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1445,6 +1445,8 @@ struct ext4_sb_info { unsigned int *s_mb_maxs; unsigned int s_group_info_size; unsigned int s_mb_free_pending; + struct list_head s_freed_data_list; /* List of blocks to be freed + after commit completed */ /* tunables */ unsigned long s_stripe; @@ -2454,6 +2456,7 @@ extern int ext4_mb_add_groupinfo(struct super_block *sb, extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, ext4_fsblk_t block, unsigned long count); extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); +extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); /* inode.c */ int ext4_inode_is_fast_symlink(struct inode *inode); |