From: Tim Chen <tim.c.chen@linux.intel.com>
To: Kemeng Shi <shikemeng@huaweicloud.com>,
viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/7] fs/writeback: bail out if there is no more inodes for IO and queued once
Date: Thu, 08 Feb 2024 11:21:00 -0800 [thread overview]
Message-ID: <acc5ebbcd6a378b090d7ce56c47ed66fd1e0ccdc.camel@linux.intel.com> (raw)
In-Reply-To: <20240208172024.23625-3-shikemeng@huaweicloud.com>
On Fri, 2024-02-09 at 01:20 +0800, Kemeng Shi wrote:
> For case there is no more inodes for IO in io list from last wb_writeback,
> We may bail out early even there is inode in dirty list should be written
> back. Only bail out when we queued once to avoid missing dirtied inode.
>
> This is from code reading...
>
> Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
> ---
> fs/fs-writeback.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index a9a918972719..edb0cff51673 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -2086,6 +2086,7 @@ static long wb_writeback(struct bdi_writeback *wb,
> struct inode *inode;
> long progress;
> struct blk_plug plug;
> + bool queued = false;
>
> if (work->for_kupdate)
> filter_expired_io(wb);
> @@ -2131,8 +2132,10 @@ static long wb_writeback(struct bdi_writeback *wb,
> dirtied_before = jiffies;
>
> trace_writeback_start(wb, work);
> - if (list_empty(&wb->b_io))
> + if (list_empty(&wb->b_io)) {
> queue_io(wb, work, dirtied_before);
> + queued = true;
> + }
> if (work->sb)
> progress = writeback_sb_inodes(work->sb, wb, work);
> else
> @@ -2155,7 +2158,7 @@ static long wb_writeback(struct bdi_writeback *wb,
> /*
> * No more inodes for IO, bail
> */
> - if (list_empty(&wb->b_more_io)) {
> + if (list_empty(&wb->b_more_io) && queued) {
Wonder if we can simply do
if (list_empty(&wb->b_more_io) && list_empty(&wb->b_io)) {
if the intention is to not bail if there are still inodes to be be flushed.
Tim
> spin_unlock(&wb->list_lock);
> break;
> }
next prev parent reply other threads:[~2024-02-08 19:21 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-08 17:20 [PATCH 0/7] Fixes and cleanups to fs-writeback Kemeng Shi
2024-02-08 17:20 ` [PATCH 1/7] fs/writeback: avoid to writeback non-expired inode in kupdate writeback Kemeng Shi
2024-02-08 18:29 ` Tim Chen
2024-02-18 2:01 ` Kemeng Shi
2024-02-28 1:46 ` Kemeng Shi
2024-02-23 13:42 ` Jan Kara
2024-02-26 11:47 ` Kemeng Shi
2024-02-08 17:20 ` [PATCH 2/7] fs/writeback: bail out if there is no more inodes for IO and queued once Kemeng Shi
2024-02-08 19:21 ` Tim Chen [this message]
2024-02-18 2:11 ` Kemeng Shi
2024-02-23 13:49 ` Jan Kara
2024-02-08 17:20 ` [PATCH 3/7] fs/writeback: remove unused parameter wb of finish_writeback_work Kemeng Shi
2024-02-08 19:26 ` Tim Chen
2024-02-23 13:49 ` Jan Kara
2024-02-08 17:20 ` [PATCH 4/7] fs/writeback: remove unneeded check in writeback_single_inode Kemeng Shi
2024-02-08 19:34 ` Tim Chen
2024-02-10 0:46 ` Dave Chinner
2024-02-18 2:37 ` Kemeng Shi
2024-02-08 17:20 ` [PATCH 5/7] fs/writeback: only calculate dirtied_before when b_io is empty Kemeng Shi
2024-02-23 13:58 ` Jan Kara
2024-02-26 11:50 ` Kemeng Shi
2024-02-08 17:20 ` [PATCH 6/7] fs/writeback: correct comment of __wakeup_flusher_threads_bdi Kemeng Shi
2024-02-23 13:59 ` Jan Kara
2024-02-08 17:20 ` [PATCH 7/7] fs/writeback: remove unnecessary return in writeback_inodes_sb Kemeng Shi
2024-02-23 13:59 ` Jan Kara
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