> 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 entry
looks good. Thanks for your patch.
Reviewed-by: Sungjong Seo <sj1557.seo@xxxxxxxxxxx>
>
> 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
