>From 35f7e2f6b1b39e6b1704567c27c8cacdd836e8ff Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Date: Mon, 14 Jan 2019 10:42:11 -0800
Subject: [PATCH] f2fs: run discard jobs when put_super
When we umount f2fs, we need to avoid long delay due to discard commands, which
is actually taking tens of seconds, if storage is very slow on UNMAP. So, this
patch introduces timeout-based work on it.
By default, let me give 5 seconds for discard.
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-fs-f2fs | 7 +++++++
fs/f2fs/f2fs.h | 5 ++++-
fs/f2fs/segment.c | 11 ++++++++++-
fs/f2fs/super.c | 4 +++-
fs/f2fs/sysfs.c | 3 +++
5 files changed, 27 insertions(+), 3 deletions(-)
--------------------------------------------------------------
The above patch can't cover all discard timeout scenario. It's should add following patch .
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index e1bd513..5751d84 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1532,6 +1532,10 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
io_interrupted = true;
break;
}
+
+ if (dpolicy->timeout != 0 &&
+ f2fs_time_over(sbi, dpolicy->timeout))
+ break;
__submit_discard_cmd(sbi, dpolicy, dc, &issued);
Best Regards!
Heng.xiao
==============================================
PFC SZ Spreadtrum
Mobile: 18664561142
Tel: +86-755-36665668 ext.2011
==============================================
-----Original Message-----
From: Chao Yu [mailto:yuchao0@xxxxxxxxxx]
Sent: Monday, July 01, 2019 5:00 PM
To: 肖衡 (Heng Xiao); Jaegeuk Kim
Cc: 李吉群 (Jiqun Li); 孟祥光 (Simon Meng)
Subject: Re: about patch <-f2fs-run-discard-jobs-when-put_super>
Hi Heng,
Thanks for the report. :)
I can confirm this issue, could you send a formal patch to fix this, please note that it needs to cc f2fs mailing list.
Thanks,
On 2019/7/1 13:29, 肖衡 (Heng Xiao) wrote:
> Sorry,
>
>
>
> for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
>
> + if (dpolicy->timeout != 0 &&
>
> + f2fs_time_over(sbi, dpolicy->timeout))
>
> + {//in some case,do not have chance to break
>
> + printk("__issue_discard_cmd,timeout and
> +break,i=%d\n",i);
>
> + break;
>
> + }
>
> +
>
> if (i + 1 < dpolicy->granularity)
>
> break;
>
>
>
> @@ -1524,6 +1539,12 @@ static int __issue_discard_cmd(struct
> f2fs_sb_info *sbi,
>
> io_interrupted = true;
>
> break;
>
> }
>
> + if (dpolicy->timeout != 0 &&
>
> + f2fs_time_over(sbi, dpolicy->timeout))
>
> + {//in some case,do need break,*please check*
>
> + printk("__issue_discard_cmd,timeout
> +and break
> 222\n");
>
> + break;
>
> + }
>
>
>
>
>
> Best Regards!
>
> Heng.xiao
>
> ==============================================
>
> PFC SZ Spreadtrum
>
> Mobile: 18664561142
>
> Tel: +86-755-36665668 ext.2011
> ==============================================
>
>
>
> *From:*肖衡(Heng Xiao)
> *Sent:* Monday, July 01, 2019 1:22 PM
> *To:* 'Jaegeuk Kim'; 'Chao Yu'
> *Cc:* 李吉群(Jiqun Li); 孟祥光(Simon Meng)
> *Subject:* about patch <-f2fs-run-discard-jobs-when-put_super>
>
>
>
> Dear Jaegeuk and Yuchao
>
>
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>
> index 905b3c7..8630cd7 100644
>
> --- a/fs/f2fs/segment.c
>
> +++ b/fs/f2fs/segment.c
>
> @@ -960,6 +960,7 @@ static void __remove_discard_cmd(struct
> f2fs_sb_info *sbi,
>
> unsigned long flags;
>
>
>
> trace_f2fs_remove_discard(dc->bdev, dc->start, dc->len);
>
> + printk("--hengxiao--%s-, start: 0x%x, len: 0x%x\n", __func__,
> +dc->start,
> dc->len);
>
>
>
> spin_lock_irqsave(&dc->lock, flags);
>
> if (dc->bio_ref) {
>
> @@ -1117,6 +1118,7 @@ static void __init_discard_policy(struct
> f2fs_sb_info *sbi,
>
>
>
> dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
>
> dpolicy->io_aware_gran = MAX_PLIST_NUM;
>
> + dpolicy->timeout = 0;
>
>
>
> if (discard_type == DPOLICY_BG) {
>
> dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
>
> @@ -1169,6 +1171,7 @@ static int __submit_discard_cmd(struct
> f2fs_sb_info *sbi,
>
> return 0;
>
>
>
> trace_f2fs_issue_discard(bdev, dc->start, dc->len);
>
> + printk("--hengxiao--%s-, start: 0x%x, len: 0x%x\n", __func__,
> +dc->start,
> dc->len);
>
>
>
> lstart = dc->lstart;
>
> start = dc->start;
>
> @@ -1500,7 +1503,19 @@ static int __issue_discard_cmd(struct
> f2fs_sb_info *sbi,
>
> int i, issued = 0;
>
> bool io_interrupted = false;
>
>
>
> +
> printk("--hengxiao--__issue_discard_cmd,dpolicy->timeout=%d\n",dpolicy
> ->timeout);
>
> +
>
> + if (dpolicy->timeout != 0)
>
> + f2fs_update_time(sbi, dpolicy->timeout);
>
> +
>
> for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
>
> + if (dpolicy->timeout != 0 &&
>
> + f2fs_time_over(sbi, dpolicy->timeout))
>
> + {//in some case,do not have chance to break,please
> +check
>
> + printk("__issue_discard_cmd,timeout and
> +break,i=%d\n",i);
>
> + break;
>
> + }
>
> +
>
> if (i + 1 < dpolicy->granularity)
>
> break;
>
>
>
> @@ -1524,6 +1539,12 @@ static int __issue_discard_cmd(struct
> f2fs_sb_info *sbi,
>
> io_interrupted = true;
>
> break;
>
> }
>
> + if (dpolicy->timeout != 0 &&
>
> + f2fs_time_over(sbi, dpolicy->timeout))
>
> + {//in some case,do need break
>
> + printk("__issue_discard_cmd,timeout
> +and break
> 222\n");
>
> + break;
>
> + }
>
>
>
>
>
>
>
> //int the case, do not have chance to break
>
> [ 559.306907] c5 1 init: Reboot start, reason:
> shutdown,userrequested,
> rebootTarget:
>
> ...
>
> [ 564.936861] c4 1
> --hengxiao--__issue_discard_cmd,dpolicy->timeout=5
>
> [ 564.943425] c4 1 --hengxiao--__submit_discard_cmd-, start: 0x4a400, len:
> 0x200
>
> [ 564.952686] c4 1 --hengxiao--__submit_discard_cmd-, start: 0x4a600, len:
> 0x200
>
> ...
>
> [ 1164.717728] c4 1 --hengxiao--__submit_discard_cmd-, start: 0xd9dc00, len:
> 0x200
>
> //when break, 1164-559=605 second elapse
>
> [ 1164.765011] c4 1 --hengxiao--__issue_discard_cmd,timeout and
> break
>
>
>
> Best Regards!
>
> Heng.xiao
>
> ==============================================
>
> PFC SZ Spreadtrum
>
> Mobile: 18664561142
>
> Tel: +86-755-36665668 ext.2011
> ==============================================
>
>
>
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