2022-01-26 09:42:04

by Jaegeuk Kim

Subject: [PATCH 1/2] f2fs: move discard parameters into discard_cmd_control

From: Konstantin Vyshetsky <[email protected]>

This patch unifies parameters related to how often discard is issued and
how many requests go out at the same time by placing them in
discard_cmd_control. The move will allow the parameters to be modified
in the future without relying on hard-coded values.

Signed-off-by: Konstantin Vyshetsky <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
---
fs/f2fs/f2fs.h | 4 ++++
fs/f2fs/segment.c | 22 +++++++++++++---------
2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 8178a9152e49..63c90416364b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -398,6 +398,10 @@ struct discard_cmd_control {
struct mutex cmd_lock;
unsigned int nr_discards; /* # of discards in the list */
unsigned int max_discards; /* max. discards to be issued */
+ unsigned int max_discard_request; /* max. discard request per round */
+ unsigned int min_discard_issue_time; /* min. interval between discard issue */
+ unsigned int mid_discard_issue_time; /* mid. interval between discard issue */
+ unsigned int max_discard_issue_time; /* max. interval between discard issue */
unsigned int discard_granularity; /* discard granularity */
unsigned int undiscard_blks; /* # of undiscard blocks */
unsigned int next_pos; /* next discard position */
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 216538b57331..56211e201d51 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1156,14 +1156,14 @@ static void __init_discard_policy(struct f2fs_sb_info *sbi,
dpolicy->ordered = false;
dpolicy->granularity = granularity;

- dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
+ dpolicy->max_requests = dcc->max_discard_request;
dpolicy->io_aware_gran = MAX_PLIST_NUM;
dpolicy->timeout = false;

if (discard_type == DPOLICY_BG) {
- dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
- dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
- dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
+ dpolicy->min_interval = dcc->min_discard_issue_time;
+ dpolicy->mid_interval = dcc->mid_discard_issue_time;
+ dpolicy->max_interval = dcc->max_discard_issue_time;
dpolicy->io_aware = true;
dpolicy->sync = false;
dpolicy->ordered = true;
@@ -1171,12 +1171,12 @@ static void __init_discard_policy(struct f2fs_sb_info *sbi,
dpolicy->granularity = 1;
if (atomic_read(&dcc->discard_cmd_cnt))
dpolicy->max_interval =
- DEF_MIN_DISCARD_ISSUE_TIME;
+ dcc->min_discard_issue_time;
}
} else if (discard_type == DPOLICY_FORCE) {
- dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
- dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
- dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
+ dpolicy->min_interval = dcc->min_discard_issue_time;
+ dpolicy->mid_interval = dcc->mid_discard_issue_time;
+ dpolicy->max_interval = dcc->max_discard_issue_time;
dpolicy->io_aware = false;
} else if (discard_type == DPOLICY_FSTRIM) {
dpolicy->io_aware = false;
@@ -1781,7 +1781,7 @@ static int issue_discard_thread(void *data)
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
wait_queue_head_t *q = &dcc->discard_wait_queue;
struct discard_policy dpolicy;
- unsigned int wait_ms = DEF_MIN_DISCARD_ISSUE_TIME;
+ unsigned int wait_ms = dcc->min_discard_issue_time;
int issued;

set_freezable();
@@ -2180,6 +2180,10 @@ static int create_discard_cmd_control(struct f2fs_sb_info *sbi)
atomic_set(&dcc->discard_cmd_cnt, 0);
dcc->nr_discards = 0;
dcc->max_discards = MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
+ dcc->max_discard_request = DEF_MAX_DISCARD_REQUEST;
+ dcc->min_discard_issue_time = DEF_MIN_DISCARD_ISSUE_TIME;
+ dcc->mid_discard_issue_time = DEF_MID_DISCARD_ISSUE_TIME;
+ dcc->max_discard_issue_time = DEF_MAX_DISCARD_ISSUE_TIME;
dcc->undiscard_blks = 0;
dcc->next_pos = 0;
dcc->root = RB_ROOT_CACHED;
--
2.35.0.rc0.227.g00780c9af4-goog

2022-01-31 23:07:15

by Chao Yu

Subject: Re: [f2fs-dev] [PATCH 1/2] f2fs: move discard parameters into discard_cmd_control

On 2022/1/26 4:22, Jaegeuk Kim wrote:
> From: Konstantin Vyshetsky <[email protected]>
>
> This patch unifies parameters related to how often discard is issued and
> how many requests go out at the same time by placing them in
> discard_cmd_control. The move will allow the parameters to be modified
> in the future without relying on hard-coded values.
>
> Signed-off-by: Konstantin Vyshetsky <[email protected]>
> Signed-off-by: Jaegeuk Kim <[email protected]>

Reviewed-by: Chao Yu <[email protected]>

Thanks,