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f2fs: introduce max_ordered_discard sysfs node

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The current max_ordered_discard is a fixed value, change it to be
configurable through the sys node.

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Yangtao Li 2022-10-25 16:32:26 +08:00 committed by Jaegeuk Kim
parent a995627e6d
commit c46867e9b9
4 changed files with 22 additions and 1 deletions
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6
Documentation/ABI/testing/sysfs-fs-f2fs
View File

@ -99,6 +99,12 @@ Description: Controls the issue rate of discard commands that consist of small
checkpoint is triggered, and issued during the checkpoint.
By default, it is disabled with 0.
What: /sys/fs/f2fs/<disk>/max_ordered_discard
Date: October 2022
Contact: "Yangtao Li" <frank.li@vivo.com>
Description: Controls the maximum ordered discard, the unit size is one block(4KB).
Set it to 16 by default.
What: /sys/fs/f2fs/<disk>/max_discard_request
Date: December 2021
Contact: "Konstantin Vyshetsky" <vkon@google.com>

3
fs/f2fs/f2fs.h
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@ -331,6 +331,8 @@ struct discard_entry {
/* default discard granularity of inner discard thread, unit: block count */
#define DEFAULT_DISCARD_GRANULARITY 16
/* default maximum discard granularity of ordered discard, unit: block count */
#define DEFAULT_MAX_ORDERED_DISCARD_GRANULARITY 16
/* max discard pend list number */
#define MAX_PLIST_NUM 512
@ -410,6 +412,7 @@ struct discard_cmd_control {
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 max_ordered_discard; /* maximum discard granularity issued by lba order */
unsigned int undiscard_blks; /* # of undiscard blocks */
unsigned int next_pos; /* next discard position */
atomic_t issued_discard; /* # of issued discard */

3
fs/f2fs/segment.c
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@ -1448,7 +1448,7 @@ retry:
if (i + 1 < dpolicy->granularity)
break;
if (i + 1 < DEFAULT_DISCARD_GRANULARITY && dpolicy->ordered)
if (i + 1 < dcc->max_ordered_discard && dpolicy->ordered)
return __issue_discard_cmd_orderly(sbi, dpolicy);
pend_list = &dcc->pend_list[i];
@ -2048,6 +2048,7 @@ static int create_discard_cmd_control(struct f2fs_sb_info *sbi)
return -ENOMEM;
dcc->discard_granularity = DEFAULT_DISCARD_GRANULARITY;
dcc->max_ordered_discard = DEFAULT_MAX_ORDERED_DISCARD_GRANULARITY;
if (F2FS_OPTION(sbi).discard_unit == DISCARD_UNIT_SEGMENT)
dcc->discard_granularity = sbi->blocks_per_seg;
else if (F2FS_OPTION(sbi).discard_unit == DISCARD_UNIT_SECTION)

11
fs/f2fs/sysfs.c
View File

@ -483,6 +483,15 @@ out:
return count;
}
if (!strcmp(a->attr.name, "max_ordered_discard")) {
if (t == 0 || t > MAX_PLIST_NUM)
return -EINVAL;
if (!f2fs_block_unit_discard(sbi))
return -EINVAL;
*ui = t;
return count;
}
if (!strcmp(a->attr.name, "migration_granularity")) {
if (t == 0 || t > sbi->segs_per_sec)
return -EINVAL;
@ -786,6 +795,7 @@ F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, min_discard_issue_time, min_discard_
F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, mid_discard_issue_time, mid_discard_issue_time);
F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_discard_issue_time, max_discard_issue_time);
F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_ordered_discard, max_ordered_discard);
F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
@ -914,6 +924,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(mid_discard_issue_time),
ATTR_LIST(max_discard_issue_time),
ATTR_LIST(discard_granularity),
ATTR_LIST(max_ordered_discard),
ATTR_LIST(pending_discard),
ATTR_LIST(ipu_policy),
ATTR_LIST(min_ipu_util),