From 105d931d482b7d1b1b2dd4b0ea30365db8630b9f Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Tue, 18 Nov 2008 12:13:12 -0500 Subject: [PATCH] Btrfs: switch back to wait_on_page_writeback to wait on metadata writes The extent based waiting was using more CPU, and other fixes have helped with the unplug storm problems. Signed-off-by: Chris Mason --- fs/btrfs/transaction.c | 29 +---------------------------- 1 file changed, 1 insertion(+), 28 deletions(-) diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index e9c8ebee..c2c3b42 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -332,7 +332,6 @@ int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, int werr = 0; struct page *page; struct inode *btree_inode = root->fs_info->btree_inode; - struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree; u64 start = 0; u64 end; unsigned long index; @@ -373,11 +372,6 @@ int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, page_cache_release(page); } } - /* - * we unplug once and then use the wait_on_extent_bit for - * everything else - */ - blk_run_address_space(btree_inode->i_mapping); while(1) { ret = find_first_extent_bit(dirty_pages, 0, &start, &end, EXTENT_DIRTY); @@ -398,28 +392,7 @@ int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, if (err) werr = err; } - if (PageWriteback(page)) { - /* - * we don't wait on the page writeback bit - * because that triggers a lot of unplugs. - * The extent bits are much nicer to - * the disks, but come with a slightly - * higher latency because we aren't forcing - * unplugs. - */ - wait_on_extent_writeback(io_tree, - page_offset(page), - page_offset(page) + - PAGE_CACHE_SIZE - 1); - } - if (PageWriteback(page)) { - /* - * the state bits get cleared before the - * page bits, lets add some extra - * paranoia here - */ - wait_on_page_writeback(page); - } + wait_on_page_writeback(page); page_cache_release(page); cond_resched(); } -- 2.7.4