Re: [PATCH] ext4: Replace CR_FAST macro with inline function for readability

[Jan Kara <jack@suse.cz>]

On Thu 29-06-23 19:17:19, Ojaswin Mujoo wrote:
> Replace CR_FAST with ext4_mb_cr_expensive() inline function for better
> readability. This function returns true if the criteria is one of the
> expensive/slower ones where lots of disk IO/prefetching is acceptable.
> 
> No functional changes are intended in this patch.
> 
> Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>

Thanks for this cleanup! Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

Just one suggestion for consideration below:

> @@ -2630,7 +2630,7 @@ static int ext4_mb_good_group_nolock(struct ext4_allocation_context *ac,
>  	free = grp->bb_free;
>  	if (free == 0)
>  		goto out;
> -	if (cr <= CR_FAST && free < ac->ac_g_ex.fe_len)
> +	if (cr <= CR_GOAL_LEN_SLOW && free < ac->ac_g_ex.fe_len)

Maybe this could be (!ext4_mb_cr_expensive(cr) || cr == CR_GOAL_LEN_SLOW)?
Or maybe more explanatory would be (cr < CR_ANY_FREE) because AFAIU that's
the only scan where we bother scanning groups that have no chance of
satisfying the full allocation? Anyway a short comment explaining this
might be useful. And in either case we can get rid of a bit confusing
CR_FAST define.

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR