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Date: Fri, 9 Oct 2009 17:26:29 +0200
From: Jan Kara <jack@...e.cz>
To: Wu Fengguang <fengguang.wu@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Theodore Tso <tytso@....edu>,
Christoph Hellwig <hch@...radead.org>,
Dave Chinner <david@...morbit.com>,
Chris Mason <chris.mason@...cle.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Li Shaohua <shaohua.li@...el.com>,
Myklebust Trond <Trond.Myklebust@...app.com>,
"jens.axboe@...cle.com" <jens.axboe@...cle.com>,
Jan Kara <jack@...e.cz>, Nick Piggin <npiggin@...e.de>,
linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/45] writeback: remove unused nonblocking and
congestion checks
On Wed 07-10-09 15:38:22, Wu Fengguang wrote:
> - no one is calling wb_writeback and write_cache_pages with
> wbc.nonblocking=1 any more
> - lumpy pageout will want to do nonblocking writeback without the
> congestion wait
>
> So remove the congestion checks as suggested by Chris.
Looks good. Since encountered_congestion isn't used, you can delete it as
well... BTW, you might need to split this patch to per-fs chunks for the
sake of merging.
Honza
>
> CC: Chris Mason <chris.mason@...cle.com>
> CC: Jens Axboe <jens.axboe@...cle.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> ---
> drivers/staging/pohmelfs/inode.c | 9 ---------
> fs/afs/write.c | 16 +---------------
> fs/cifs/file.c | 10 ----------
> fs/fs-writeback.c | 8 --------
> fs/gfs2/aops.c | 10 ----------
> fs/xfs/linux-2.6/xfs_aops.c | 6 +-----
> mm/page-writeback.c | 12 ------------
> 7 files changed, 2 insertions(+), 69 deletions(-)
>
> --- linux.orig/fs/fs-writeback.c 2009-10-06 23:31:54.000000000 +0800
> +++ linux/fs/fs-writeback.c 2009-10-06 23:31:59.000000000 +0800
> @@ -660,14 +660,6 @@ static void writeback_inodes_wb(struct b
> continue;
> }
>
> - if (wbc->nonblocking && bdi_write_congested(wb->bdi)) {
> - wbc->encountered_congestion = 1;
> - if (!is_blkdev_sb)
> - break; /* Skip a congested fs */
> - requeue_io(inode);
> - continue; /* Skip a congested blockdev */
> - }
> -
> /*
> * Was this inode dirtied after sync_sb_inodes was called?
> * This keeps sync from extra jobs and livelock.
> --- linux.orig/mm/page-writeback.c 2009-10-06 23:31:54.000000000 +0800
> +++ linux/mm/page-writeback.c 2009-10-06 23:31:59.000000000 +0800
> @@ -787,7 +787,6 @@ int write_cache_pages(struct address_spa
> struct writeback_control *wbc, writepage_t writepage,
> void *data)
> {
> - struct backing_dev_info *bdi = mapping->backing_dev_info;
> int ret = 0;
> int done = 0;
> struct pagevec pvec;
> @@ -800,11 +799,6 @@ int write_cache_pages(struct address_spa
> int range_whole = 0;
> long nr_to_write = wbc->nr_to_write;
>
> - if (wbc->nonblocking && bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> - return 0;
> - }
> -
> pagevec_init(&pvec, 0);
> if (wbc->range_cyclic) {
> writeback_index = mapping->writeback_index; /* prev offset */
> @@ -923,12 +917,6 @@ continue_unlock:
> break;
> }
> }
> -
> - if (wbc->nonblocking && bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> - done = 1;
> - break;
> - }
> }
> pagevec_release(&pvec);
> cond_resched();
> --- linux.orig/drivers/staging/pohmelfs/inode.c 2009-10-06 23:31:41.000000000 +0800
> +++ linux/drivers/staging/pohmelfs/inode.c 2009-10-06 23:31:59.000000000 +0800
> @@ -152,11 +152,6 @@ static int pohmelfs_writepages(struct ad
> int scanned = 0;
> int range_whole = 0;
>
> - if (wbc->nonblocking && bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> - return 0;
> - }
> -
> if (wbc->range_cyclic) {
> index = mapping->writeback_index; /* Start from prev offset */
> end = -1;
> @@ -248,10 +243,6 @@ retry:
>
> if (wbc->nr_to_write <= 0)
> done = 1;
> - if (wbc->nonblocking && bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> - done = 1;
> - }
>
> continue;
> out_continue:
> --- linux.orig/fs/afs/write.c 2009-10-06 23:31:41.000000000 +0800
> +++ linux/fs/afs/write.c 2009-10-06 23:31:59.000000000 +0800
> @@ -455,8 +455,6 @@ int afs_writepage(struct page *page, str
> }
>
> wbc->nr_to_write -= ret;
> - if (wbc->nonblocking && bdi_write_congested(bdi))
> - wbc->encountered_congestion = 1;
>
> _leave(" = 0");
> return 0;
> @@ -529,11 +527,6 @@ static int afs_writepages_region(struct
>
> wbc->nr_to_write -= ret;
>
> - if (wbc->nonblocking && bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> - break;
> - }
> -
> cond_resched();
> } while (index < end && wbc->nr_to_write > 0);
>
> @@ -554,18 +547,11 @@ int afs_writepages(struct address_space
>
> _enter("");
>
> - if (wbc->nonblocking && bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> - _leave(" = 0 [congest]");
> - return 0;
> - }
> -
> if (wbc->range_cyclic) {
> start = mapping->writeback_index;
> end = -1;
> ret = afs_writepages_region(mapping, wbc, start, end, &next);
> - if (start > 0 && wbc->nr_to_write > 0 && ret == 0 &&
> - !(wbc->nonblocking && wbc->encountered_congestion))
> + if (start > 0 && wbc->nr_to_write > 0 && ret == 0)
> ret = afs_writepages_region(mapping, wbc, 0, start,
> &next);
> mapping->writeback_index = next;
> --- linux.orig/fs/cifs/file.c 2009-10-06 23:31:41.000000000 +0800
> +++ linux/fs/cifs/file.c 2009-10-06 23:31:59.000000000 +0800
> @@ -1379,16 +1379,6 @@ static int cifs_writepages(struct addres
> return generic_writepages(mapping, wbc);
>
>
> - /*
> - * BB: Is this meaningful for a non-block-device file system?
> - * If it is, we should test it again after we do I/O
> - */
> - if (wbc->nonblocking && bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> - kfree(iov);
> - return 0;
> - }
> -
> xid = GetXid();
>
> pagevec_init(&pvec, 0);
> --- linux.orig/fs/gfs2/aops.c 2009-10-06 23:31:41.000000000 +0800
> +++ linux/fs/gfs2/aops.c 2009-10-06 23:31:59.000000000 +0800
> @@ -313,11 +313,6 @@ static int gfs2_write_jdata_pagevec(stru
>
> if (ret || (--(wbc->nr_to_write) <= 0))
> ret = 1;
> - if (wbc->nonblocking && bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> - ret = 1;
> - }
> -
> }
> gfs2_trans_end(sdp);
> return ret;
> @@ -348,11 +343,6 @@ static int gfs2_write_cache_jdata(struct
> int scanned = 0;
> int range_whole = 0;
>
> - if (wbc->nonblocking && bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> - return 0;
> - }
> -
> pagevec_init(&pvec, 0);
> if (wbc->range_cyclic) {
> index = mapping->writeback_index; /* Start from prev offset */
> --- linux.orig/fs/xfs/linux-2.6/xfs_aops.c 2009-10-06 23:31:41.000000000 +0800
> +++ linux/fs/xfs/linux-2.6/xfs_aops.c 2009-10-06 23:31:59.000000000 +0800
> @@ -890,12 +890,8 @@ xfs_convert_page(
>
> bdi = inode->i_mapping->backing_dev_info;
> wbc->nr_to_write--;
> - if (bdi_write_congested(bdi)) {
> - wbc->encountered_congestion = 1;
> + if (wbc->nr_to_write <= 0)
> done = 1;
> - } else if (wbc->nr_to_write <= 0) {
> - done = 1;
> - }
> }
> xfs_start_page_writeback(page, !page_dirty, count);
> }
>
>
--
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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