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* [PATCH 1/2] f2fs: add sysfs nodes to get discard information
@ 2021-08-14 17:58 Yangtao Li
  2021-08-14 17:58 ` [PATCH 2/2] f2fs: fix description about main_blkaddr node Yangtao Li
  2021-08-16  2:35 ` [PATCH 1/2] f2fs: add sysfs nodes to get discard information Chao Yu
  0 siblings, 2 replies; 9+ messages in thread
From: Yangtao Li @ 2021-08-14 17:58 UTC (permalink / raw)
  To: jaegeuk, chao; +Cc: linux-f2fs-devel, linux-kernel, Yangtao Li

I've added new sysfs nodes to show discard stat since mount, which
will help us analyze whether the performance problem is related to
discard.

issued_discard  - Shows the number of issued discard
queued_discard  - Shows the number of cached discard cmd count
discard_cmd_cnt - Shows the number of cached discard cmd count
undiscard_blks  - Shows the number of undiscard blocks

Signed-off-by: Yangtao Li <frank.li@vivo.com>
---
 Documentation/ABI/testing/sysfs-fs-f2fs | 20 +++++++++++
 fs/f2fs/sysfs.c                         | 44 +++++++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index ef4b9218ae1e..32df6d16d74f 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -493,3 +493,23 @@ Contact:	"Chao Yu" <yuchao0@huawei.com>
 Description:	When ATGC is on, it controls age threshold to bypass GCing young
 		candidates whose age is not beyond the threshold, by default it was
 		initialized as 604800 seconds (equals to 7 days).
+
+What:		/sys/fs/f2fs/<disk>/issued_discard
+Date:		August 2021
+Contact:	"Yangtao Li" <frank.li@vivo.com>
+Description:	Shows the number of issued discard.
+
+What:		/sys/fs/f2fs/<disk>/queued_discard
+Date:		August 2021
+Contact:	"Yangtao Li" <frank.li@vivo.com>
+Description:	Shows the number of queued discard.
+
+What:		/sys/fs/f2fs/<disk>/discard_cmd_cnt
+Date:		August 2021
+Contact:	"Yangtao Li" <frank.li@vivo.com>
+Description:	Shows the number of cached discard cmd count.
+
+What:		/sys/fs/f2fs/<disk>/undiscard_blks
+Date:		August 2021
+Contact:	"Yangtao Li" <frank.li@vivo.com>
+Description:	Shows the number of undiscard blocks.
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 6642246206bd..b7d6c1adc7f8 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -248,6 +248,42 @@ static ssize_t main_blkaddr_show(struct f2fs_attr *a,
 			(unsigned long long)MAIN_BLKADDR(sbi));
 }
 
+static ssize_t issued_discard_show(struct f2fs_attr *a,
+				struct f2fs_sb_info *sbi, char *buf)
+{
+	struct discard_cmd_control *dcc_info = SM_I(sbi)->dcc_info;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n",
+			(unsigned long long)atomic_read(&dcc_info->issued_discard));
+}
+
+static ssize_t queued_discard_show(struct f2fs_attr *a,
+				struct f2fs_sb_info *sbi, char *buf)
+{
+	struct discard_cmd_control *dcc_info = SM_I(sbi)->dcc_info;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n",
+			(unsigned long long)atomic_read(&dcc_info->queued_discard));
+}
+
+static ssize_t discard_cmd_cnt_show(struct f2fs_attr *a,
+				struct f2fs_sb_info *sbi, char *buf)
+{
+	struct discard_cmd_control *dcc_info = SM_I(sbi)->dcc_info;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n",
+			(unsigned long long)atomic_read(&dcc_info->discard_cmd_cnt));
+}
+
+static ssize_t undiscard_blks_show(struct f2fs_attr *a,
+				struct f2fs_sb_info *sbi, char *buf)
+{
+	struct discard_cmd_control *dcc_info = SM_I(sbi)->dcc_info;
+
+	return snprintf(buf, PAGE_SIZE, "%llu\n",
+			(unsigned long long)dcc_info->undiscard_blks);
+}
+
 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 			struct f2fs_sb_info *sbi, char *buf)
 {
@@ -690,6 +726,10 @@ F2FS_GENERAL_RO_ATTR(unusable);
 F2FS_GENERAL_RO_ATTR(encoding);
 F2FS_GENERAL_RO_ATTR(mounted_time_sec);
 F2FS_GENERAL_RO_ATTR(main_blkaddr);
+F2FS_GENERAL_RO_ATTR(issued_discard);
+F2FS_GENERAL_RO_ATTR(queued_discard);
+F2FS_GENERAL_RO_ATTR(discard_cmd_cnt);
+F2FS_GENERAL_RO_ATTR(undiscard_blks);
 #ifdef CONFIG_F2FS_STAT_FS
 F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, cp_foreground_calls, cp_count);
 F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, cp_background_calls, bg_cp_count);
@@ -750,6 +790,10 @@ static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(gc_urgent),
 	ATTR_LIST(reclaim_segments),
 	ATTR_LIST(main_blkaddr),
+	ATTR_LIST(issued_discard),
+	ATTR_LIST(queued_discard),
+	ATTR_LIST(discard_cmd_cnt),
+	ATTR_LIST(undiscard_blks),
 	ATTR_LIST(max_small_discards),
 	ATTR_LIST(discard_granularity),
 	ATTR_LIST(batched_trim_sections),
-- 
2.32.0


^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2021-08-19  4:51 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-14 17:58 [PATCH 1/2] f2fs: add sysfs nodes to get discard information Yangtao Li
2021-08-14 17:58 ` [PATCH 2/2] f2fs: fix description about main_blkaddr node Yangtao Li
2021-08-16  2:37   ` Chao Yu
2021-08-16  2:35 ` [PATCH 1/2] f2fs: add sysfs nodes to get discard information Chao Yu
2021-08-16  2:42   ` 李扬韬
2021-08-16  4:15     ` Chao Yu
2021-08-16  6:13       ` 李扬韬
2021-08-17  0:16         ` Jaegeuk Kim
2021-08-19  4:49         ` Chao Yu

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