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List:       linux-btrfs
Subject:    [PATCH] btrfs: limit the number of asynchronous delalloc pages to reasonable value
From:       Wang Xiaoguang <wangxg.fnst () cn ! fujitsu ! com>
Date:       2016-11-08 9:30:58
Message-ID: 1478597458-29287-1-git-send-email-wangxg.fnst () cn ! fujitsu ! com
[Download RAW message or body]

The current limit of number of asynchronous delalloc pages is (10 * SZ_1M).
For 4K page, the total ram bytes would be 40G, very big value, I think in
most cases, this limit will not work, here I set limit of the number of
asynchronous delalloc pages to SZ_1M(4GB ram bytes).

Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
---
 fs/btrfs/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8e3a5a2..3a910f6 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1158,7 +1158,7 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	unsigned long nr_pages;
 	u64 cur_end;
-	int limit = 10 * SZ_1M;
+	int limit = SZ_1M;
 
 	clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED,
 			 1, 0, NULL, GFP_NOFS);
-- 
2.5.0



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