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From: liujinbao1 <jinbaoliu365@gmail.com>
To: jaegeuk@kernel.org,
	chao@kernel.org
Cc: linux-f2fs-devel@lists.sourceforge.net,
	linux-kernel@vger.kernel.org,
	liujinbao1 <liujinbao1@xiaomi.corp-partner.google.com>
Subject: [PATCH] UPSTREAM: f2fs: sysfs: support gc_io_aware
Date: Tue, 30 Jan 2024 20:51:13 +0800
Message-ID: <20240130125113.14081-1-jinbaoliu365@gmail.com>
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From: liujinbao1 <liujinbao1@xiaomi.corp-partner.google.com>

Currently, IO can only be ignored when GC_URGENT_HIGH is set,
 and the default algorithm used for GC_URGENT_HIGH is greedy.
It gives a way to enable/disable IO aware feature for background
gc, so that we can tune background gc more precisely. e.g.
force to disable IO aware and choose more suitable algorithm
if there are large number of dirty segments.

Change-Id: Ic0ea1bf8fb6602f0dd88b924088f1c1b33fcd809
Signed-off-by: liujinbao1 <liujinbao1@xiaomi.corp-partner.google.com>
---
 Documentation/ABI/testing/sysfs-fs-f2fs | 6 ++++++
 fs/f2fs/f2fs.h                          | 6 ++++++
 fs/f2fs/gc.c                            | 3 ++-
 fs/f2fs/gc.h                            | 1 +
 fs/f2fs/sysfs.c                         | 9 +++++++++
 5 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 36c3cb547901..47f02fa471fe 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -16,6 +16,12 @@ Contact:	"Namjae Jeon" <namjae.jeon@samsung.com>
 Description:	Controls the default sleep time for gc_thread. Time
 		is in milliseconds.
 
+What:		/sys/fs/f2fs/<disk>/gc_io_aware
+Date:		January 2024
+Contact:	"Jinbao Liu" <liujinbao1@xiaomi.com>
+Description:	It controls to enable/disable IO aware feature for background gc.
++		By default, the value is 1 which indicates IO aware is on.
+
 What:		/sys/fs/f2fs/<disk>/gc_idle
 Date:		July 2013
 Contact:	"Namjae Jeon" <namjae.jeon@samsung.com>
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 214fdd590fdf..ebe953e7459e 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -374,6 +374,12 @@ enum {
 	MAX_DPOLICY,
 };
 
+enum {
+	GC_IO_AWARE_DISABLE,	/* force to not be aware of IO */
+	GC_IO_AWARE_ENABLE,	/* force to be aware of IO */
+	GC_IO_AWARE_MAX,
+};
+
 struct discard_policy {
 	int type;			/* type of discard */
 	unsigned int min_interval;	/* used for candidates exist */
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 309da3d0faff..34a1e6b35af6 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -109,7 +109,7 @@ static int gc_thread_func(void *data)
 			goto next;
 		}
 
-		if (!is_idle(sbi, GC_TIME)) {
+		if (gc_th->io_aware && !is_idle(sbi, GC_TIME)) {
 			increase_sleep_time(gc_th, &wait_ms);
 			f2fs_up_write(&sbi->gc_lock);
 			stat_io_skip_bggc_count(sbi);
@@ -182,6 +182,7 @@ int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
 	gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME;
 	gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
 	gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;
+	gc_th->io_aware = GC_IO_AWARE_ENABLE;
 
 	gc_th->gc_wake = false;
 
diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h
index 28a00942802c..51d6ad26b76a 100644
--- a/fs/f2fs/gc.h
+++ b/fs/f2fs/gc.h
@@ -41,6 +41,7 @@ struct f2fs_gc_kthread {
 	unsigned int min_sleep_time;
 	unsigned int max_sleep_time;
 	unsigned int no_gc_sleep_time;
+	bool io_aware;
 
 	/* for changing gc mode */
 	bool gc_wake;
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 417fae96890f..95409cfc48f4 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -516,6 +516,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
 		return count;
 	}
 
+	if (!strcmp(a->attr.name, "gc_io_aware")) {
+		if (t >= GC_IO_AWARE_MAX)
+			return -EINVAL;
+		*ui = t;
+		return count;
+	}
+
 	if (!strcmp(a->attr.name, "migration_granularity")) {
 		if (t == 0 || t > sbi->segs_per_sec)
 			return -EINVAL;
@@ -906,6 +913,7 @@ GC_THREAD_RW_ATTR(gc_urgent_sleep_time, urgent_sleep_time);
 GC_THREAD_RW_ATTR(gc_min_sleep_time, min_sleep_time);
 GC_THREAD_RW_ATTR(gc_max_sleep_time, max_sleep_time);
 GC_THREAD_RW_ATTR(gc_no_gc_sleep_time, no_gc_sleep_time);
+GC_THREAD_RW_ATTR(gc_io_aware, io_aware);
 
 /* SM_INFO ATTR */
 SM_INFO_RW_ATTR(reclaim_segments, rec_prefree_segments);
@@ -1061,6 +1069,7 @@ static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(gc_min_sleep_time),
 	ATTR_LIST(gc_max_sleep_time),
 	ATTR_LIST(gc_no_gc_sleep_time),
+	ATTR_LIST(gc_io_aware),
 	ATTR_LIST(gc_idle),
 	ATTR_LIST(gc_urgent),
 	ATTR_LIST(reclaim_segments),
-- 
2.39.0