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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 <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-11-12 15:00:38 +09:00
parent b29555505d
commit 7ac8c3b051
1 changed files with 2 additions and 0 deletions
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2
fs/f2fs/super.c
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@ -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_no_gc_sleep_time, no_gc_sleep_time);
F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle); 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, 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) #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = { static struct attribute *f2fs_attrs[] = {
@ -183,6 +184,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(gc_no_gc_sleep_time), ATTR_LIST(gc_no_gc_sleep_time),
ATTR_LIST(gc_idle), ATTR_LIST(gc_idle),
ATTR_LIST(reclaim_segments), ATTR_LIST(reclaim_segments),
ATTR_LIST(max_small_discards),
NULL, NULL,
}; };