From: Dave Chinner <david@fromorbit.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Christoph Hellwig <hch@infradead.org>, Jan Kara <jack@suse.cz>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-fsdevel@vger.kernel.org,
Linux Memory Management List <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/6] writeback: dont redirty tail an inode with dirty pages
Date: Mon, 12 Jul 2010 12:01:09 +1000 [thread overview]
Message-ID: <20100712020109.GB25335@dastard> (raw)
In-Reply-To: <20100711021749.021449821@intel.com>
On Sun, Jul 11, 2010 at 10:07:00AM +0800, Wu Fengguang wrote:
> This avoids delaying writeback for an expired (XFS) inode with lots of
> dirty pages, but no active dirtier at the moment. Previously we only do
> that for the kupdate case.
>
> CC: Dave Chinner <david@fromorbit.com>
> CC: Christoph Hellwig <hch@infradead.org>
> Acked-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
> ---
> fs/fs-writeback.c | 20 +++++++-------------
> 1 file changed, 7 insertions(+), 13 deletions(-)
>
> --- linux-next.orig/fs/fs-writeback.c 2010-07-11 08:53:44.000000000 +0800
> +++ linux-next/fs/fs-writeback.c 2010-07-11 08:57:35.000000000 +0800
> @@ -367,18 +367,7 @@ writeback_single_inode(struct inode *ino
> spin_lock(&inode_lock);
> inode->i_state &= ~I_SYNC;
> if (!(inode->i_state & I_FREEING)) {
> - if ((inode->i_state & I_DIRTY_PAGES) && wbc->for_kupdate) {
> - /*
> - * More pages get dirtied by a fast dirtier.
> - */
> - goto select_queue;
> - } else if (inode->i_state & I_DIRTY) {
> - /*
> - * At least XFS will redirty the inode during the
> - * writeback (delalloc) and on io completion (isize).
> - */
> - redirty_tail(inode);
> - } else if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
> + if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
> /*
> * We didn't write back all the pages. nfs_writepages()
> * sometimes bales out without doing anything. Redirty
> @@ -400,7 +389,6 @@ writeback_single_inode(struct inode *ino
> * soon as the queue becomes uncongested.
> */
> inode->i_state |= I_DIRTY_PAGES;
> -select_queue:
> if (wbc->nr_to_write <= 0) {
> /*
> * slice used up: queue for next turn
> @@ -423,6 +411,12 @@ select_queue:
> inode->i_state |= I_DIRTY_PAGES;
> redirty_tail(inode);
> }
> + } else if (inode->i_state & I_DIRTY) {
> + /*
> + * At least XFS will redirty the inode during the
> + * writeback (delalloc) and on io completion (isize).
> + */
> + redirty_tail(inode);
I'd drop the mention of XFS here - any filesystem that does delayed
allocation or unwritten extent conversion after Io completion will
cause this. Perhaps make the comment:
/*
* Filesystems can dirty the inode during writeback
* operations, such as delayed allocation during submission
* or metadata updates after data IO completion.
*/
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-07-12 2:01 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-11 2:06 [PATCH 0/6] writeback cleanups and trivial fixes Wu Fengguang
2010-07-11 2:06 ` [PATCH 1/6] writeback: take account of NR_WRITEBACK_TEMP in balance_dirty_pages() Wu Fengguang
2010-07-12 21:52 ` Andrew Morton
2010-07-13 8:58 ` Miklos Szeredi
2010-07-15 14:50 ` Wu Fengguang
2010-07-11 2:06 ` [PATCH 2/6] writeback: reduce calls to global_page_state " Wu Fengguang
2010-07-26 15:19 ` Jan Kara
2010-07-27 3:59 ` Wu Fengguang
2010-07-27 9:12 ` Jan Kara
2010-07-28 2:04 ` Wu Fengguang
2010-08-03 14:55 ` Peter Zijlstra
2010-07-11 2:06 ` [PATCH 3/6] writeback: avoid unnecessary calculation of bdi dirty thresholds Wu Fengguang
2010-07-12 21:56 ` Andrew Morton
2010-07-15 14:55 ` Wu Fengguang
2010-07-19 21:35 ` Andrew Morton
2010-07-20 3:34 ` Wu Fengguang
2010-07-20 4:14 ` Andrew Morton
2010-08-03 15:03 ` Peter Zijlstra
2010-08-03 15:10 ` Wu Fengguang
2010-08-04 16:41 ` Wu Fengguang
2010-08-04 17:10 ` Peter Zijlstra
2010-07-11 2:07 ` [PATCH 4/6] writeback: dont redirty tail an inode with dirty pages Wu Fengguang
2010-07-12 2:01 ` Dave Chinner [this message]
2010-07-12 15:31 ` Wu Fengguang
2010-07-12 22:13 ` Andrew Morton
2010-07-15 15:35 ` Wu Fengguang
2010-07-11 2:07 ` [PATCH 5/6] writeback: fix queue_io() ordering Wu Fengguang
2010-07-12 22:15 ` Andrew Morton
2010-07-11 2:07 ` [PATCH 6/6] writeback: merge for_kupdate and !for_kupdate cases Wu Fengguang
2010-07-12 2:08 ` Dave Chinner
2010-07-12 15:52 ` Wu Fengguang
2010-07-12 22:06 ` Dave Chinner
2010-07-12 22:22 ` Andrew Morton
2010-08-05 16:01 ` Wu Fengguang
2010-07-11 2:44 ` [PATCH 0/6] writeback cleanups and trivial fixes Christoph Hellwig
2010-07-11 2:50 ` Wu Fengguang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100712020109.GB25335@dastard \
--to=david@fromorbit.com \
--cc=a.p.zijlstra@chello.nl \
--cc=akpm@linux-foundation.org \
--cc=fengguang.wu@intel.com \
--cc=hch@infradead.org \
--cc=jack@suse.cz \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).