This patch adds support for counting the average time of submit discard
command, and we can see its value in debugfs.
Signed-off-by: Yangtao Li <frank...@vivo.com>
---
fs/f2fs/debug.c | 7 +++++--
fs/f2fs/f2fs.h | 5 +++++
fs/f2fs/segment.c | 17 +++++++++++++++--
3 files changed, 25 insertions(+), 4 deletions(-)
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index a216dcdf6941..ede862cb178d 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -109,6 +109,9 @@ static void update_general_status(struct f2fs_sb_info *sbi)
llist_empty(&SM_I(sbi)->fcc_info->issue_list);
}
if (SM_I(sbi)->dcc_info) {
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+
+ si->discard_avg = dcc->discard_time_avg;
si->nr_discarded =
atomic_read(&SM_I(sbi)->dcc_info->issued_discard);
si->nr_discarding =
@@ -506,11 +509,11 @@ static int stat_show(struct seq_file *s, void *v)
seq_printf(s, " - IO_R (Data: %4d, Node: %4d, Meta: %4d\n",
si->nr_rd_data, si->nr_rd_node, si->nr_rd_meta);
seq_printf(s, " - IO_W (CP: %4d, Data: %4d, Flush: (%4d %4d
%4d), "
- "Discard: (%4d %4d)) cmd: %4d undiscard:%4u\n",
+ "Discard: (%4d %4d avg:%4lldns)) cmd:
%4d undiscard:%4u\n",
si->nr_wb_cp_data, si->nr_wb_data,
si->nr_flushing, si->nr_flushed,
si->flush_list_empty,
- si->nr_discarding, si->nr_discarded,
+ si->nr_discarding, si->nr_discarded,
ktime_to_us(si->discard_avg),
si->nr_discard_cmd, si->undiscard_blks);
seq_printf(s, " - atomic IO: %4d (Max. %4d)\n",
si->aw_cnt, si->max_aw_cnt);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index f0833638f59e..6891467fdb6a 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -372,6 +372,8 @@ struct discard_cmd {
int error; /* bio error */
spinlock_t lock; /* for state/bio_ref updating */
unsigned short bio_ref; /* bio reference count */
+ struct discard_cmd_control *dcc; /* global discard cmd control */
+ ktime_t submit_start; /* submit start time */
};
enum {
@@ -415,6 +417,8 @@ struct discard_cmd_control {
unsigned int max_ordered_discard; /* maximum discard granularity
issued by lba order */
unsigned int undiscard_blks; /* # of undiscard blocks */
unsigned int next_pos; /* next discard position */
+ spinlock_t discard_time_lock; /* for discard time statistics */
+ ktime_t discard_time_avg; /* issued discard cmd avg time
*/
atomic_t issued_discard; /* # of issued discard */
atomic_t queued_discard; /* # of queued discard */
atomic_t discard_cmd_cnt; /* # of cached cmd count */
@@ -3883,6 +3887,7 @@ struct f2fs_stat_info {
int nr_dio_read, nr_dio_write;
unsigned int io_skip_bggc, other_skip_bggc;
int nr_flushing, nr_flushed, flush_list_empty;
+ ktime_t discard_avg;
int nr_discarding, nr_discarded;
int nr_discard_cmd;
unsigned int undiscard_blks;
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 8b0b76550578..dd67e936615a 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -936,6 +936,7 @@ static struct discard_cmd *__create_discard_cmd(struct
f2fs_sb_info *sbi,
list_add_tail(&dc->list, pend_list);
spin_lock_init(&dc->lock);
dc->bio_ref = 0;
+ dc->dcc = dcc;
atomic_inc(&dcc->discard_cmd_cnt);
dcc->undiscard_blks += len;
@@ -1005,9 +1006,13 @@ static void __remove_discard_cmd(struct f2fs_sb_info
*sbi,
static void f2fs_submit_discard_endio(struct bio *bio)
{
struct discard_cmd *dc = (struct discard_cmd *)bio->bi_private;
+ struct discard_cmd_control *dcc = dc->dcc;
unsigned long flags;
+ ktime_t submit_time;
+ int nr_discarded;
spin_lock_irqsave(&dc->lock, flags);
+ submit_time = ktime_sub(ktime_get(), dc->submit_start);
if (!dc->error)
dc->error = blk_status_to_errno(bio->bi_status);
dc->bio_ref--;
@@ -1017,6 +1022,13 @@ static void f2fs_submit_discard_endio(struct bio *bio)
}
spin_unlock_irqrestore(&dc->lock, flags);
bio_put(bio);
+
+ spin_lock_irqsave(&dcc->discard_time_lock, flags);
+ nr_discarded = atomic_read(&dcc->issued_discard);
+ dcc->discard_time_avg = div_u64(ktime_add(nr_discarded *
dcc->discard_time_avg, submit_time),
+
nr_discarded + 1);
+ atomic_inc(&dcc->issued_discard);
+ spin_unlock_irqrestore(&dcc->discard_time_lock, flags);
}
static void __check_sit_bitmap(struct f2fs_sb_info *sbi,
@@ -1165,6 +1177,7 @@ static int __submit_discard_cmd(struct f2fs_sb_info *sbi,
* right away
*/
spin_lock_irqsave(&dc->lock, flags);
+ dc->submit_start = ktime_get();
if (last)
dc->state = D_SUBMIT;
else
@@ -1184,8 +1197,6 @@ static int __submit_discard_cmd(struct f2fs_sb_info *sbi,
bio->bi_opf |= flag;
submit_bio(bio);
- atomic_inc(&dcc->issued_discard);
-
f2fs_update_iostat(sbi, NULL, FS_DISCARD, 1);
lstart += len;
@@ -2076,9 +2087,11 @@ static int create_discard_cmd_control(struct
f2fs_sb_info *sbi)
INIT_LIST_HEAD(&dcc->wait_list);
INIT_LIST_HEAD(&dcc->fstrim_list);
mutex_init(&dcc->cmd_lock);
+ spin_lock_init(&dcc->discard_time_lock);
atomic_set(&dcc->issued_discard, 0);
atomic_set(&dcc->queued_discard, 0);
atomic_set(&dcc->discard_cmd_cnt, 0);
+ dcc->discard_time_avg = 0;
dcc->nr_discards = 0;
dcc->max_discards = MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
dcc->max_discard_request = DEF_MAX_DISCARD_REQUEST;
--
2.25.1
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