> > There are stressful update of cluster allocation bitmap when using > > dirsync mount option which is doing sync buffer on every cluster bit clearing. > > This could result in performance degradation when deleting big size file. > > Fix to update only when the bitmap buffer index is changed would make > > less disk access, improving performance especially for truncate operation. > > > > Testing with Samsung 256GB sdcard, mounted with dirsync option (mount > > -t exfat /dev/block/mmcblk0p1 /temp/mount -o dirsync) > > > > Remove 4GB file, blktrace result. > > [Before] : 39 secs. > > Total (blktrace): > > Reads Queued: 0, 0KiB Writes Queued: 32775, > 16387KiB > > Read Dispatches: 0, 0KiB Write Dispatches: 32775, > 16387KiB > > Reads Requeued: 0 Writes Requeued: 0 > > Reads Completed: 0, 0KiB Writes Completed: 32775, > 16387KiB > > Read Merges: 0, 0KiB Write Merges: 0, > 0KiB > > IO unplugs: 2 Timer unplugs: 0 > > > > [After] : 1 sec. > > Total (blktrace): > > Reads Queued: 0, 0KiB Writes Queued: 13, > 6KiB > > Read Dispatches: 0, 0KiB Write Dispatches: 13, > 6KiB > > Reads Requeued: 0 Writes Requeued: 0 > > Reads Completed: 0, 0KiB Writes Completed: 13, > 6KiB > > Read Merges: 0, 0KiB Write Merges: 0, > 0KiB > > IO unplugs: 1 Timer unplugs: 0 > > > > Signed-off-by: Hyeongseok Kim <hyeongseok@xxxxxxxxx> > > Looks good. > Thanks for your work! > > Acked-by: Sungjong Seo <sj1557.seo@xxxxxxxxxxx> Applied. Thanks!
