diff options
| author | Christoph Hellwig <hch@lst.de> | 2022-05-26 09:36:40 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-07-25 17:45:33 +0200 |
| commit | d7b9416fe5c581c69e446b971c4a0394c609fd89 (patch) | |
| tree | ea102c5c89b0a6541d1f561302e929803337affc /fs/btrfs/volumes.h | |
| parent | 08a6f464342cc09b14680dcefb3c5eeac8a06aeb (diff) | |
btrfs: remove btrfs_end_io_wq
All reads bio that go through btrfs_map_bio need to be completed in
user context. And read I/Os are the most common and timing critical
in almost any file system workloads.
Embed a work_struct into struct btrfs_bio and use it to complete all
read bios submitted through btrfs_map, using the REQ_META flag to decide
which workqueue they are placed on.
This removes the need for a separate 128 byte allocation (typically
rounded up to 192 bytes by slab) for all reads with a size increase
of 24 bytes for struct btrfs_bio. Future patches will reorganize
struct btrfs_bio to make use of this extra space for writes as well.
(All sizes are based a on typical 64-bit non-debug build)
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 1e86c48268ed..7973d11e5f5d 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -371,6 +371,9 @@ struct btrfs_bio { u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; struct bvec_iter iter; + /* For read end I/O handling */ + struct work_struct end_io_work; + /* * This member must come last, bio_alloc_bioset will allocate enough * bytes for entire btrfs_bio but relies on bio being last. |