BACKPORT: f2fs: introduce gc_urgent_mid mode
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>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Bug: 279706487
Change-Id: I52405f36fcbc0b9ffae1abba3b215ba8506ef6a1
(cherry picked from commit d98af5f4552058a5c22030641ef79cee92c61f54)
[Dylan: Resolved minor conflict in fs/f2fs/gc.c ]
Signed-off-by: Dylan Chang <dylan.chang@nothing.tech>
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 75f4bbb..020284a 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -271,11 +271,16 @@
What: /sys/fs/f2fs/<disk>/gc_urgent
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. 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
@@ -506,7 +511,7 @@
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
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index f33e64a..a549f7b 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -469,12 +469,14 @@
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);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 2e13419..1e53d000 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1286,6 +1286,7 @@
GC_IDLE_AT,
GC_URGENT_HIGH,
GC_URGENT_LOW,
+ GC_URGENT_MID,
MAX_GC_MODE,
};
@@ -2754,6 +2755,9 @@
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;
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index ab774c6..7bcde3e 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -90,7 +90,8 @@
* 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_HIGH) {
+ 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;
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index a095919..07cdf2e 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -466,6 +466,13 @@
}
} 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;
}
