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f2fs: add GC_URGENT_LOW mode in gc_urgent 

Added a new gc_urgent mode, GC_URGENT_LOW, in which mode
F2FS will lower the bar of checking idle in order to
process outstanding discard commands and GC a little bit
aggressively.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daeho Jeong 2020-07-02 13:14:14 +09:00 committed by Jaegeuk Kim
parent 6b12367da2
commit 0e5e81114d
5 changed files with 23 additions and 11 deletions
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4
Documentation/ABI/testing/sysfs-fs-f2fs
View File

@ -229,7 +229,9 @@ Date: August 2017
Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
Description: Do background GC agressively when set. When gc_urgent = 1,
background thread starts to do GC by given gc_urgent_sleep_time
interval. It is set to 0 by default.
interval. When gc_urgent = 2, F2FS will lower the bar of
checking idle in order to process outstanding discard commands
and GC a little bit aggressively. It is set to 0 by default.
What: /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
Date: August 2017

10
fs/f2fs/f2fs.h
View File

@ -1268,7 +1268,8 @@ enum {
GC_NORMAL,
GC_IDLE_CB,
GC_IDLE_GREEDY,
GC_URGENT,
GC_URGENT_HIGH,
GC_URGENT_LOW,
};
enum {
@ -1525,6 +1526,7 @@ struct f2fs_sb_info {
unsigned int cur_victim_sec; /* current victim section num */
unsigned int gc_mode; /* current GC state */
unsigned int next_victim_seg[2]; /* next segment in victim section */
/* for skip statistic */
unsigned int atomic_files; /* # of opened atomic file */
unsigned long long skipped_atomic_files[2]; /* FG_GC and BG_GC */
@ -2465,7 +2467,7 @@ static inline void *f2fs_kmem_cache_alloc(struct kmem_cache *cachep,
static inline bool is_idle(struct f2fs_sb_info *sbi, int type)
{
if (sbi->gc_mode == GC_URGENT)
if (sbi->gc_mode == GC_URGENT_HIGH)
return true;
if (get_pages(sbi, F2FS_RD_DATA) || get_pages(sbi, F2FS_RD_NODE) ||
@ -2483,6 +2485,10 @@ static inline bool is_idle(struct f2fs_sb_info *sbi, int type)
atomic_read(&SM_I(sbi)->fcc_info->queued_flush))
return false;
if (sbi->gc_mode == GC_URGENT_LOW &&
(type == DISCARD_TIME || type == GC_TIME))
return true;
return f2fs_time_over(sbi, type);
}

6
fs/f2fs/gc.c
View File

@ -82,7 +82,7 @@ static int gc_thread_func(void *data)
* invalidated soon after by user update or deletion.
* So, I'd like to wait some time to collect dirty segments.
*/
if (sbi->gc_mode == GC_URGENT) {
if (sbi->gc_mode == GC_URGENT_HIGH) {
wait_ms = gc_th->urgent_sleep_time;
down_write(&sbi->gc_lock);
goto do_gc;
@ -176,7 +176,7 @@ static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
gc_mode = GC_CB;
break;
case GC_IDLE_GREEDY:
case GC_URGENT:
case GC_URGENT_HIGH:
gc_mode = GC_GREEDY;
break;
}
@ -211,7 +211,7 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
* foreground GC and urgent GC cases.
*/
if (gc_type != FG_GC &&
(sbi->gc_mode != GC_URGENT) &&
(sbi->gc_mode != GC_URGENT_HIGH) &&
p->max_search > sbi->max_victim_search)
p->max_search = sbi->max_victim_search;

4
fs/f2fs/segment.c
View File

@ -174,7 +174,7 @@ bool f2fs_need_SSR(struct f2fs_sb_info *sbi)
if (f2fs_lfs_mode(sbi))
return false;
if (sbi->gc_mode == GC_URGENT)
if (sbi->gc_mode == GC_URGENT_HIGH)
return true;
if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
return true;
@ -1759,7 +1759,7 @@ static int issue_discard_thread(void *data)
continue;
}
if (sbi->gc_mode == GC_URGENT)
if (sbi->gc_mode == GC_URGENT_HIGH)
__init_discard_policy(sbi, &dpolicy, DPOLICY_FORCE, 1);
sb_start_intwrite(sbi->sb);

10
fs/f2fs/sysfs.c
View File

@ -350,16 +350,20 @@ out:
return -EINVAL;
if (!strcmp(a->attr.name, "gc_urgent")) {
if (t >= 1) {
sbi->gc_mode = GC_URGENT;
if (t == 0) {
sbi->gc_mode = GC_NORMAL;
} else if (t == 1) {
sbi->gc_mode = GC_URGENT_HIGH;
if (sbi->gc_thread) {
sbi->gc_thread->gc_wake = 1;
wake_up_interruptible_all(
&sbi->gc_thread->gc_wait_queue_head);
wake_up_discard_thread(sbi, true);
}
} else if (t == 2) {
sbi->gc_mode = GC_URGENT_LOW;
} else {
sbi->gc_mode = GC_NORMAL;
return -EINVAL;
}
return count;
}