linux-kernel - Re: [PATCH 09/10] ext4: return found group directly in ext4_mb_choose_next_group_best

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Message-Id: <87v8edjmfc.fsf@doe.com>
Date:   Fri, 21 Jul 2023 21:18:07 +0530
From:   Ritesh Harjani (IBM) <ritesh.list@...il.com>
To:     Kemeng Shi <shikemeng@...weicloud.com>, tytso@....edu,
        adilger.kernel@...ger.ca, ojaswin@...ux.ibm.com,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     shikemeng@...weicloud.com
Subject: Re: [PATCH 09/10] ext4: return found group directly in ext4_mb_choose_next_group_best_avail

Kemeng Shi <shikemeng@...weicloud.com> writes:

> Return good group when it's found in loop to remove futher check if good
> group is found after loop.
>
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
> ---
>  fs/ext4/mballoc.c | 18 ++++++++----------
>  1 file changed, 8 insertions(+), 10 deletions(-)
>

Looks good to me. Feel free to add: 

Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>

-ritesh

> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 6f8e804905d5..b04eceeab967 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -1043,18 +1043,16 @@ static void ext4_mb_choose_next_group_best_avail(struct ext4_allocation_context
>  							ac->ac_g_ex.fe_len);
>  
>  		grp = ext4_mb_find_good_group_avg_frag_lists(ac, frag_order);
> -		if (grp)
> -			break;
> +		if (grp) {
> +			*group = grp->bb_group;
> +			ac->ac_flags |= EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED;
> +			return;
> +		}
>  	}
>  
> -	if (grp) {
> -		*group = grp->bb_group;
> -		ac->ac_flags |= EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED;
> -	} else {
> -		/* Reset goal length to original goal length before falling into CR_GOAL_LEN_SLOW */
> -		ac->ac_g_ex.fe_len = ac->ac_orig_goal_len;
> -		*new_cr = CR_GOAL_LEN_SLOW;
> -	}
> +	/* Reset goal length to original goal length before falling into CR_GOAL_LEN_SLOW */
> +	ac->ac_g_ex.fe_len = ac->ac_orig_goal_len;
> +	*new_cr = CR_GOAL_LEN_SLOW;
>  }
>  
>  static inline int should_optimize_scan(struct ext4_allocation_context *ac)
> -- 
> 2.30.0