From 7ac8c3b051ed3a3e71df72a7ffc44e14cc5c2bae Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Tue, 12 Nov 2013 15:00:38 +0900 Subject: [PATCH] f2fs: add a sysfs entry to control max_discards If frequent small discards are issued to the device, the performance would be degraded significantly. So, this patch adds a sysfs entry to control the number of discards to be issued during a checkpoint procedure. By default, f2fs does not issue any small discards, which means max_discards is zero. Signed-off-by: Jaegeuk Kim --- fs/f2fs/super.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index e9aa3f7..a022412 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -175,6 +175,7 @@ F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time); F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time); F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle); F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments); +F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards); #define ATTR_LIST(name) (&f2fs_attr_##name.attr) static struct attribute *f2fs_attrs[] = { @@ -183,6 +184,7 @@ static struct attribute *f2fs_attrs[] = { ATTR_LIST(gc_no_gc_sleep_time), ATTR_LIST(gc_idle), ATTR_LIST(reclaim_segments), + ATTR_LIST(max_small_discards), NULL, }; -- 2.7.4