linux-ext4 - Re: [PATCH 5/5] ext4: Use buckets for cr 1 block scan instead of rbtree

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Message-ID: <YxmoBpQdRqh/e4ol@li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com>
Date:   Thu, 8 Sep 2022 13:59:58 +0530
From:   Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>
Subject: Re: [PATCH 5/5] ext4: Use buckets for cr 1 block scan instead of
 rbtree

Hi Jan,

On Tue, Sep 06, 2022 at 05:29:11PM +0200, Jan Kara wrote:
>  
>  ** snip **
>  /*
>   * Choose next group by traversing average fragment size tree. Updates *new_cr
Maybe we can change this to "average fragment size list of suitable
order"
> - * if cr lvel needs an update. Sets EXT4_MB_SEARCH_NEXT_LINEAR to indicate that
> - * the linear search should continue for one iteration since there's lock
> - * contention on the rb tree lock.
> + * if cr level needs an update. 
>   */
>  static void ext4_mb_choose_next_group_cr1(struct ext4_allocation_context *ac,
>  		int *new_cr, ext4_group_t *group, ext4_group_t ngroups)
>  {
>  	struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
> -	int avg_fragment_size, best_so_far;
> -	struct rb_node *node, *found;
> -	struct ext4_group_info *grp;

Other than that, this patch along with the updated mb_structs_summary
proc file change looks good to me.

Regards,
Ojaswin