summaryrefslogtreecommitdiff
path: root/fs/btrfs/qgroup.h
diff options
context:
space:
mode:
authorQu Wenruo <wqu@suse.com>2018-09-27 09:42:35 +0300
committerDavid Sterba <dsterba@suse.com>2018-10-15 18:23:36 +0300
commit3d0174f78e72301324a5b0ba7d67676474e36fff (patch)
tree3396913881f8828eb65f82ed9e06719f8e5dd3f5 /fs/btrfs/qgroup.h
parent2cd86d309bd1203241ceb833effe90787f3564a1 (diff)
downloadlinux-3d0174f78e72301324a5b0ba7d67676474e36fff.tar.xz
btrfs: qgroup: Only trace data extents in leaves if we're relocating data block group
For qgroup_trace_extent_swap(), if we find one leaf that needs to be traced, we will also iterate all file extents and trace them. This is OK if we're relocating data block groups, but if we're relocating metadata block groups, balance code itself has ensured that both subtree of file tree and reloc tree contain the same contents. That's to say, if we're relocating metadata block groups, all file extents in reloc and file tree should match, thus no need to trace them. This should reduce the total number of dirty extents processed in metadata block group balance. [[Benchmark]] (with all previous enhancement) Hardware: VM 4G vRAM, 8 vCPUs, disk is using 'unsafe' cache mode, backing device is SAMSUNG 850 evo SSD. Host has 16G ram. Mkfs parameter: --nodesize 4K (To bump up tree size) Initial subvolume contents: 4G data copied from /usr and /lib. (With enough regular small files) Snapshots: 16 snapshots of the original subvolume. each snapshot has 3 random files modified. balance parameter: -m So the content should be pretty similar to a real world root fs layout. | v4.19-rc1 | w/ patchset | diff (*) --------------------------------------------------------------- relocated extents | 22929 | 22851 | -0.3% qgroup dirty extents | 227757 | 140886 | -38.1% time (sys) | 65.253s | 37.464s | -42.6% time (real) | 74.032s | 44.722s | -39.6% Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/qgroup.h')
-rw-r--r--fs/btrfs/qgroup.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h
index 1aaf4c276900..80ebeb3ab5ba 100644
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -238,6 +238,7 @@ int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
u64 root_gen, int root_level);
int btrfs_qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
+ struct btrfs_block_group_cache *bg_cache,
struct extent_buffer *src_parent, int src_slot,
struct extent_buffer *dst_parent, int dst_slot,
u64 last_snapshot);