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authorQu Wenruo <wqu@suse.com>2023-02-17 08:37:03 +0300
committerDavid Sterba <dsterba@suse.com>2023-04-17 19:01:14 +0300
commit18d758a2d81a97b9a54a37d535870ce3170cc208 (patch)
tree19b31f1bd0b4917f8648a5cbfd96b4780056a89a /include/trace/events
parent1faf3885067d5be65597d5dc682f0da505822104 (diff)
downloadlinux-18d758a2d81a97b9a54a37d535870ce3170cc208.tar.xz
btrfs: replace btrfs_io_context::raid_map with a fixed u64 value
In btrfs_io_context structure, we have a pointer raid_map, which indicates the logical bytenr for each stripe. But considering we always call sort_parity_stripes(), the result raid_map[] is always sorted, thus raid_map[0] is always the logical bytenr of the full stripe. So why we waste the space and time (for sorting) for raid_map? This patch will replace btrfs_io_context::raid_map with a single u64 number, full_stripe_start, by: - Replace btrfs_io_context::raid_map with full_stripe_start - Replace call sites using raid_map[0] to use full_stripe_start - Replace call sites using raid_map[i] to compare with nr_data_stripes. The benefits are: - Less memory wasted on raid_map It's sizeof(u64) * num_stripes vs sizeof(u64). It'll always save at least one u64, and the benefit grows larger with num_stripes. - No more weird alloc_btrfs_io_context() behavior As there is only one fixed size + one variable length array. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'include/trace/events')
-rw-r--r--include/trace/events/btrfs.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 75d7d22c3a27..8ea9cea9bfeb 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -2422,7 +2422,7 @@ DECLARE_EVENT_CLASS(btrfs_raid56_bio,
),
TP_fast_assign_btrfs(rbio->bioc->fs_info,
- __entry->full_stripe = rbio->bioc->raid_map[0];
+ __entry->full_stripe = rbio->bioc->full_stripe_logical;
__entry->physical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
__entry->len = bio->bi_iter.bi_size;
__entry->opf = bio_op(bio);