f2fs: let discard thread wait a little longer if dev is busy
This patch modify discard thread wait policy as below:
issued io_interrupted wait time(ms)
1. 8 0 50
2. (0,8) 1 50
3. 0 1 500 (dev is busy)
4. 0 0 60000 (no candidates)
Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 41337cb..cc4b53f 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -937,6 +937,7 @@
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->io_aware = true;
dpolicy->sync = false;
@@ -946,6 +947,7 @@
}
} 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->io_aware = false;
} else if (discard_type == DPOLICY_FSTRIM) {
@@ -1420,9 +1422,11 @@
sb_start_intwrite(sbi->sb);
issued = __issue_discard_cmd(sbi, &dpolicy);
- if (issued) {
+ if (issued > 0) {
__wait_all_discard_cmd(sbi, &dpolicy);
wait_ms = dpolicy.min_interval;
+ } else if (issued == -1){
+ wait_ms = dpolicy.mid_interval;
} else {
wait_ms = dpolicy.max_interval;
}