From e6c6de18f010d9a7d592f4044d2c30213cb3a7bc Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Tue, 12 Sep 2017 21:35:12 +0800 Subject: f2fs: hurry up to issue discard after io interruption Once we encounter I/O interruption during issuing discards, we will delay long time before next round, but if system status is I/O idle during the time, it may loses opportunity to issue discards. So this patch changes to hurry up to issue discard after io interruption. Besides, this patch also fixes to issue discards accurately with assigned rate. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/segment.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 7fd742f747ce..dedf0209d820 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1062,6 +1062,7 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi, bool issue_cond) struct blk_plug plug; int iter = 0, issued = 0; int i; + bool io_interrupted = false; mutex_lock(&dcc->cmd_lock); f2fs_bug_on(sbi, @@ -1083,11 +1084,20 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi, bool issue_cond) continue; } - if (!issue_cond || is_idle(sbi)) { + if (!issue_cond) { + __submit_discard_cmd(sbi, dc); issued++; + continue; + } + + if (is_idle(sbi)) { __submit_discard_cmd(sbi, dc); + issued++; + } else { + io_interrupted = true; } - if (issue_cond && iter++ > DISCARD_ISSUE_RATE) + + if (++iter >= DISCARD_ISSUE_RATE) goto out; } if (list_empty(pend_list) && dcc->pend_list_tag[i] & P_TRIM) @@ -1097,6 +1107,9 @@ out: blk_finish_plug(&plug); mutex_unlock(&dcc->cmd_lock); + if (!issued && io_interrupted) + issued = -1; + return issued; } -- cgit v1.2.3