On Thu, Apr 26, 2018 at 05:17:20PM +0800, Qu Wenruo wrote:
> This patch will add the following trace events:
> 1) btrfs_remove_block_group
> For btrfs_remove_block_group() function.
> Triggered when a block group is really removed.
>
> 2) btrfs_add_unused_block_group
> Triggered which block group is added to unused_bgs list.
>
> 3) btrfs_skip_unused_block_group
> Triggered which unused block group is not deleted.
>
> These trace events is pretty handy to debug case related to block group
> auto remove.
Sounds useful.
> Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
> +DECLARE_EVENT_CLASS(btrfs__block_group,
> + TP_PROTO(const struct btrfs_block_group_cache *bg_cache),
> +
> + TP_ARGS(bg_cache),
> +
> + TP_STRUCT__entry_btrfs(
> + __field( u64, bytenr )
> + __field( u64, flags )
> + __field( u64, len )
> + __field( u64, used )
> + ),
> +
> + TP_fast_assign_btrfs(bg_cache->fs_info,
> + __entry->bytenr = bg_cache->key.objectid,
> + __entry->len = bg_cache->key.offset,
> + __entry->flags = bg_cache->flags;
> + __entry->used = btrfs_block_group_used(&bg_cache->item);
> + ),
> +
> + TP_printk_btrfs("bg bytenr=%llu len=%llu used=%llu flags=%llu(%s)",
> + __entry->bytenr, __entry->len, __entry->used, __entry->flags,
> + __print_flags(__entry->flags, "|", BTRFS_GROUP_FLAGS))
I've reorered the fields so they're sorted the same way in all 3
sections, as defined in the printk (bytenr, len, used, flags).
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
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