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3c771c1944
One of the bottleneck of the new scrub code is the extra csum tree
search.
The old code would only do the csum tree search for each scrub bio,
which can be as large as 512KiB, thus they can afford to allocate a new
path each time.
But the new scrub code is doing csum tree search for each stripe, which
is only 64KiB, this means we'd better re-use the same csum path during
each search.
This patch would introduce a per-sctx path for csum tree search, as we
don't need to re-allocate the path every time we need to do a csum tree
search.
With this change we can further improve the queue depth and improve the
scrub read performance:
Before (with regression and cached extent tree path):
Device r/s rkB/s rrqm/s %rrqm r_await rareq-sz aqu-sz %util
nvme0n1p3 15875.00 1013328.00 12.00 0.08 0.08 63.83 1.35 100.00
After (with both cached extent/csum tree path):
nvme0n1p3 17759.00 1133280.00 10.00 0.06 0.08 63.81 1.50 100.00
Fixes: e02ee89baa ("btrfs: scrub: switch scrub_simple_mirror() to scrub_stripe infrastructure")
CC: stable@vger.kernel.org # 6.4+
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
73 lines
2.7 KiB
C
73 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_FILE_ITEM_H
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#define BTRFS_FILE_ITEM_H
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#include "accessors.h"
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#define BTRFS_FILE_EXTENT_INLINE_DATA_START \
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(offsetof(struct btrfs_file_extent_item, disk_bytenr))
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static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
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{
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return BTRFS_MAX_ITEM_SIZE(info) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
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}
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/*
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* Return the number of bytes used by the item on disk, minus the size of any
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* extent headers. If a file is compressed on disk, this is the compressed
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* size.
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*/
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static inline u32 btrfs_file_extent_inline_item_len(
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const struct extent_buffer *eb,
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int nr)
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{
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return btrfs_item_size(eb, nr) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
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}
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static inline unsigned long btrfs_file_extent_inline_start(
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const struct btrfs_file_extent_item *e)
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{
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return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
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}
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static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
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{
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return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
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}
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int btrfs_del_csums(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 bytenr, u64 len);
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blk_status_t btrfs_lookup_bio_sums(struct btrfs_bio *bbio);
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int btrfs_insert_hole_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 objectid, u64 pos,
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u64 num_bytes);
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int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, u64 objectid,
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u64 bytenr, int mod);
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int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_ordered_sum *sums);
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blk_status_t btrfs_csum_one_bio(struct btrfs_bio *bbio);
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blk_status_t btrfs_alloc_dummy_sum(struct btrfs_bio *bbio);
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int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
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struct list_head *list, int search_commit,
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bool nowait);
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int btrfs_lookup_csums_list(struct btrfs_root *root, u64 start, u64 end,
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struct list_head *list, int search_commit,
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bool nowait);
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int btrfs_lookup_csums_bitmap(struct btrfs_root *root, struct btrfs_path *path,
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u64 start, u64 end, u8 *csum_buf,
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unsigned long *csum_bitmap);
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void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
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const struct btrfs_path *path,
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struct btrfs_file_extent_item *fi,
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struct extent_map *em);
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int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
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u64 len);
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int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start, u64 len);
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void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
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u64 btrfs_file_extent_end(const struct btrfs_path *path);
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#endif
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