• Dennis Zhou's avatar
    btrfs: discard one region at a time in async discard · 2bee7eb8
    Dennis Zhou authored
    The prior two patches added discarding via a background workqueue. This
    just piggybacked off of the fstrim code to trim the whole block at once.
    Well inevitably this is worse performance wise and will aggressively
    overtrim. But it was nice to plumb the other infrastructure to keep the
    patches easier to review.
    
    This adds the real goal of this series which is discarding slowly (ie. a
    slow long running fstrim). The discarding is split into two phases,
    extents and then bitmaps. The reason for this is two fold. First, the
    bitmap regions overlap the extent regions. Second, discarding the
    extents first will let the newly trimmed bitmaps have the highest chance
    of coalescing when being readded to the free space cache.
    Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
    Signed-off-by: default avatarDennis Zhou <dennis@kernel.org>
    Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
    Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
    2bee7eb8
block-group.h 8.78 KB