Messages in this thread | | | From | "Sungjong Seo" <> | Subject | RE: [PATCH] exfat: improve performance of exfat_free_cluster when using dirsync mount option | Date | Thu, 7 Jan 2021 15:23:36 +0900 |
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> 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@gmail.com>
Looks good. Thanks for your work!
Acked-by: Sungjong Seo <sj1557.seo@samsung.com>
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