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f2fs: introduce gc_urgent_mid mode

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We need a mid level of gc urgent mode to do GC forcibly in a period
of given gc_urgent_sleep_time, but not like using greedy GC approach
and switching to SSR mode such as gc urgent high mode. This can be
used for more aggressive periodic storage clean up.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daeho Jeong 2022-03-15 21:14:14 -07:00 committed by Jaegeuk Kim
parent d284af43f7
commit d98af5f455
5 changed files with 28 additions and 7 deletions
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17
Documentation/ABI/testing/sysfs-fs-f2fs
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@ -297,11 +297,16 @@ Description: Shows current reserved blocks in system, it may be temporarily
What: /sys/fs/f2fs/<disk>/gc_urgent
Date: August 2017
Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
Description: Do background GC aggressively when set. When gc_urgent = 1,
background thread starts to do GC by given gc_urgent_sleep_time
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.
Description: Do background GC aggressively when set. Set to 0 by default.
gc urgent high(1): does GC forcibly in a period of given
gc_urgent_sleep_time and ignores I/O idling check. uses greedy
GC approach and turns SSR mode on.
gc urgent low(2): lowers the bar of checking I/O idling in
order to process outstanding discard commands and GC a
little bit aggressively. uses cost benefit GC approach.
gc urgent mid(3): does GC forcibly in a period of given
gc_urgent_sleep_time and executes a mid level of I/O idling check.
uses cost benefit GC approach.
What: /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
Date: August 2017
@ -532,7 +537,7 @@ Date: July 2021
Contact: "Daeho Jeong" <daehojeong@google.com>
Description: Show how many segments have been reclaimed by GC during a specific
GC mode (0: GC normal, 1: GC idle CB, 2: GC idle greedy,
3: GC idle AT, 4: GC urgent high, 5: GC urgent low)
3: GC idle AT, 4: GC urgent high, 5: GC urgent low 6: GC urgent mid)
You can re-initialize this value to "0".
What: /sys/fs/f2fs/<disk>/gc_segment_mode

4
fs/f2fs/debug.c
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@ -476,12 +476,14 @@ static int stat_show(struct seq_file *s, void *v)
si->node_segs, si->bg_node_segs);
seq_printf(s, " - Reclaimed segs : Normal (%d), Idle CB (%d), "
"Idle Greedy (%d), Idle AT (%d), "
"Urgent High (%d), Urgent Low (%d)\n",
"Urgent High (%d), Urgent Mid (%d), "
"Urgent Low (%d)\n",
si->sbi->gc_reclaimed_segs[GC_NORMAL],
si->sbi->gc_reclaimed_segs[GC_IDLE_CB],
si->sbi->gc_reclaimed_segs[GC_IDLE_GREEDY],
si->sbi->gc_reclaimed_segs[GC_IDLE_AT],
si->sbi->gc_reclaimed_segs[GC_URGENT_HIGH],
si->sbi->gc_reclaimed_segs[GC_URGENT_MID],
si->sbi->gc_reclaimed_segs[GC_URGENT_LOW]);
seq_printf(s, "Try to move %d blocks (BG: %d)\n", si->tot_blks,
si->bg_data_blks + si->bg_node_blks);

4
fs/f2fs/f2fs.h
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@ -1313,6 +1313,7 @@ enum {
GC_IDLE_AT,
GC_URGENT_HIGH,
GC_URGENT_LOW,
GC_URGENT_MID,
MAX_GC_MODE,
};
@ -2784,6 +2785,9 @@ static inline bool is_idle(struct f2fs_sb_info *sbi, int type)
if (is_inflight_io(sbi, type))
return false;
if (sbi->gc_mode == GC_URGENT_MID)
return true;
if (sbi->gc_mode == GC_URGENT_LOW &&
(type == DISCARD_TIME || type == GC_TIME))
return true;

3
fs/f2fs/gc.c
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@ -103,7 +103,10 @@ static int gc_thread_func(void *data)
sbi->gc_urgent_high_remaining--;
}
spin_unlock(&sbi->gc_urgent_high_lock);
}
if (sbi->gc_mode == GC_URGENT_HIGH ||
sbi->gc_mode == GC_URGENT_MID) {
wait_ms = gc_th->urgent_sleep_time;
f2fs_down_write(&sbi->gc_lock);
goto do_gc;

7
fs/f2fs/sysfs.c
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@ -468,6 +468,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
}
} else if (t == 2) {
sbi->gc_mode = GC_URGENT_LOW;
} else if (t == 3) {
sbi->gc_mode = GC_URGENT_MID;
if (sbi->gc_thread) {
sbi->gc_thread->gc_wake = 1;
wake_up_interruptible_all(
&sbi->gc_thread->gc_wait_queue_head);
}
} else {
return -EINVAL;
}