This patch set changes sync dentry-by-dentry to sync
dentrySet-by-dentrySet, and remove some syncs that do not cause
data loss. It not only improves the performance of sync dentry,
but also reduces the consumption of storage device life.
I used the following commands and blktrace to measure the improvements
on a class 10 SDXC card.
rm -fr $mnt/dir; mkdir $mnt/dir; sync
time (for ((i=0;i<1000;i++));do touch $mnt/dir/${prefix}$i;done;sync $mnt)
time (for ((i=0;i<1000;i++));do rm $mnt/dir/${prefix}$i;done;sync $mnt)
| case | name len | create | unlink |
| | | time | write size | time | write size |
|------+----------+----------+------------+-----------+------------|
| 1 | 15 | 10.260s | 191KiB | 9.829s | 96KiB |
| 2 | 15 | 11.456s | 562KiB | 11.032s | 562KiB |
| 3 | 15 | 30.637s | 3500KiB | 21.740s | 2000KiB |
| 1 | 120 | 10.840s | 644KiB | 9.961s | 315KiB |
| 2 | 120 | 13.282s | 1092KiB | 12.432s | 752KiB |
| 3 | 120 | 45.393s | 7573KiB | 37.395s | 5500KiB |
| 1 | 255 | 11.549s | 1028KiB | 9.994s | 594KiB |
| 2 | 255 | 15.826s | 2170KiB | 13.387s | 1063KiB |
| 3 | 255 | 1m7.211s | 12335KiB | 0m58.517s | 10004KiB |
case 1. disable dirsync
case 2. with this patch set and enable dirsync
case 3. without this patch set and enable dirsync
Changes for v3
- [2/10] Allow deleted entry follow unused enrty
Changes for v2:
- Fix typoes in patch subject
- Merge [3/11] and [8/11] in v1 to [7/10] in v2
- Update some code comments
- Avoid else{} in __exfat_get_dentry_set()
- Rename the argument type of __exfat_get_dentry_set() to
num_entries
Yuezhang Mo (10):
exfat: add __exfat_get_dentry_set() helper
exfat: add exfat_get_empty_dentry_set() helper
exfat: convert exfat_add_entry() to use dentry cache
exfat: convert exfat_remove_entries() to use dentry cache
exfat: move free cluster out of exfat_init_ext_entry()
exfat: convert exfat_init_ext_entry() to use dentry cache
exfat: convert exfat_find_empty_entry() to use dentry cache
exfat: remove unused functions
exfat: do not sync parent dir if just update timestamp
exfat: remove duplicate update parent dir
fs/exfat/dir.c | 288 ++++++++++++++++++------------------
fs/exfat/exfat_fs.h | 25 ++--
fs/exfat/inode.c | 2 +-
fs/exfat/namei.c | 352 +++++++++++++++++---------------------------
4 files changed, 291 insertions(+), 376 deletions(-)
--
2.34.1
