f2fs: add GC_URGENT_LOW mode in gc_urgent (0e5e8111) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-fs-f2fs

+3 −1

Original line number	Diff line number	Diff line
		@@ -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

+8 −2

Original line number	Diff line number	Diff line
		@@ -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);
		}

+3 −3

Original line number	Diff line number	Diff line
		@@ -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;

+2 −2

Original line number	Diff line number	Diff line
		@@ -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);

+7 −3

Original line number	Diff line number	Diff line
		@@ -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;
		}