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btrfs: keep track of discard reuse stats

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Keep track of how much we are discarding and how often we are reusing
with async discard. The discard_*_bytes values don't need any special
protection because the work item provides the single threaded access.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Dennis Zhou
2020-01-02 16:26:41 -05:00
committed by David Sterba
parent 5cb0724e1b
commit 9ddf648f9c
4 changed files with 58 additions and 0 deletions
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5
fs/btrfs/discard.c
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@@ -417,11 +417,13 @@ static void btrfs_discard_workfn(struct work_struct *work)
block_group->discard_cursor,
btrfs_block_group_end(block_group),
minlen, maxlen, true);
discard_ctl->discard_bitmap_bytes += trimmed;
} else {
btrfs_trim_block_group_extents(block_group, &trimmed,
block_group->discard_cursor,
btrfs_block_group_end(block_group),
minlen, true);
discard_ctl->discard_extent_bytes += trimmed;
}
discard_ctl->prev_discard = trimmed;
@@ -626,6 +628,9 @@ void btrfs_discard_init(struct btrfs_fs_info *fs_info)
discard_ctl->delay = BTRFS_DISCARD_MAX_DELAY_MSEC;
discard_ctl->iops_limit = BTRFS_DISCARD_MAX_IOPS;
discard_ctl->kbps_limit = 0;
discard_ctl->discard_extent_bytes = 0;
discard_ctl->discard_bitmap_bytes = 0;
atomic64_set(&discard_ctl->discard_bytes_saved, 0);
}
void btrfs_discard_cleanup(struct btrfs_fs_info *fs_info)