From 24542bf7ea5e4fdfdb5157ff544c093fa4dcb536 Mon Sep 17 00:00:00 2001 From: Zach Brown Date: Fri, 16 Nov 2012 00:04:43 +0000 Subject: [PATCH] btrfs: limit fallocate extent reservation to 256MB Very large fallocate requests are cpu bound and result in extents with a repeating pattern of ever decreasing size: $ time fallocate -l 1T file real 0m13.039s ( an excerpt of the extents from btrfs-debug-tree: ) prealloc data disk byte 1536292564992 nr 397312 prealloc data disk byte 1536292962304 nr 196608 prealloc data disk byte 1536293158912 nr 98304 prealloc data disk byte 1536293257216 nr 49152 prealloc data disk byte 1536293306368 nr 24576 prealloc data disk byte 1536293330944 nr 12288 prealloc data disk byte 1536293343232 nr 8192 prealloc data disk byte 1536293351424 nr 4096 prealloc data disk byte 1536293355520 nr 4096 prealloc data disk byte 1536293359616 nr 4096 The excessive cpu use comes from __btrfs_prealloc_file_range() trying to allocate the entire remaining size after each extent is allocated. btrfs_reserve_extent() repeatedly cuts this requested size in half until it gets down to the size that the allocators can return. We limit the problem for now by capping each reservation at 256 meg. The small extents come from a masking bug when decreasing the requested reservation size. The high 32bits are cleared and the remaining low bits might happen to reserve a small size. Fix this by using round_down() which properly casts the mask. After these fixes huge fallocate requests are fast and result in nice large extents: $ time fallocate -l 1T file real 0m0.082s prealloc data disk byte 1112425889792 nr 268435456 prealloc data disk byte 1112694325248 nr 268435456 prealloc data disk byte 1112962760704 nr 268435456 Reported-by: Eric Sandeen Signed-off-by: Zach Brown Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 2 +- fs/btrfs/inode.c | 5 +++-- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index b3ecca447ddf..d2b3a5e9a621 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -6143,7 +6143,7 @@ again: if (ret == -ENOSPC) { if (!final_tried) { num_bytes = num_bytes >> 1; - num_bytes = num_bytes & ~(root->sectorsize - 1); + num_bytes = round_down(num_bytes, root->sectorsize); num_bytes = max(num_bytes, min_alloc_size); if (num_bytes == min_alloc_size) final_tried = true; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 4e6a11c2cfdd..3bc62b181ef8 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7894,8 +7894,9 @@ static int __btrfs_prealloc_file_range(struct inode *inode, int mode, } } - ret = btrfs_reserve_extent(trans, root, num_bytes, min_size, - 0, *alloc_hint, &ins, 1); + ret = btrfs_reserve_extent(trans, root, + min(num_bytes, 256ULL * 1024 * 1024), + min_size, 0, *alloc_hint, &ins, 1); if (ret) { if (own_trans) btrfs_end_transaction(trans, root); -- 2.20.1