Contact: "Yangtao Li" <frank.li@vivo.com>
Description: Show the current gc_mode as a string.
This is a read-only entry.
+
+What: /sys/fs/f2fs/<disk>/discard_urgent_util
+Date: November 2022
+Contact: "Yangtao Li" <frank.li@vivo.com>
+Description: When space utilization exceeds this, do background DISCARD aggressively.
+ Does DISCARD forcibly in a period of given min_discard_issue_time when the number
+ of discards is not 0 and set discard granularity to 1.
+ Default: 80
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_urgent_util; /* utilization which issue discard proactively */
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 */
dpolicy->io_aware = true;
dpolicy->sync = false;
dpolicy->ordered = true;
- if (utilization(sbi) > DEF_DISCARD_URGENT_UTIL) {
+ if (utilization(sbi) > dcc->discard_urgent_util) {
dpolicy->granularity = MIN_DISCARD_GRANULARITY;
if (atomic_read(&dcc->discard_cmd_cnt))
dpolicy->max_interval =
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->discard_urgent_util = DEF_DISCARD_URGENT_UTIL;
dcc->undiscard_blks = 0;
dcc->next_pos = 0;
dcc->root = RB_ROOT_CACHED;
return count;
}
+ if (!strcmp(a->attr.name, "discard_urgent_util")) {
+ if (t > 100)
+ return -EINVAL;
+ *ui = t;
+ return count;
+ }
+
if (!strcmp(a->attr.name, "migration_granularity")) {
if (t == 0 || t > sbi->segs_per_sec)
return -EINVAL;
F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, min_discard_issue_time, min_discard_issue_time);
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_urgent_util, discard_urgent_util);
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);
ATTR_LIST(min_discard_issue_time),
ATTR_LIST(mid_discard_issue_time),
ATTR_LIST(max_discard_issue_time),
+ ATTR_LIST(discard_urgent_util),
ATTR_LIST(discard_granularity),
ATTR_LIST(max_ordered_discard),
ATTR_LIST(pending_discard),