[PATCH 04/45] writeback: remove unused nonblocking and congestion checks
From: Wu Fengguang
Date: Wed Oct 07 2009 - 04:03:46 EST
- 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.
CC: Chris Mason <chris.mason@xxxxxxxxxx>
CC: Jens Axboe <jens.axboe@xxxxxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
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);
}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/