linux-kernel - Re: [PATCH] fs: reclaim least recently used dquots

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Date:   Mon, 11 Jun 2018 12:19:02 +0200
From:   Jan Kara <jack@...e.cz>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Jan Kara <jack@...e.com>, Greg Thelen <gthelen@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: reclaim least recently used dquots

On Thu 07-06-18 18:37:59, Shakeel Butt wrote:
> From: Greg Thelen <gthelen@...gle.com>
> 
> The dquots in the free_dquots list are not reclaimed in LRU way.
> put_dquot_last() puts entries to the tail and dqcache_shrink_scan()
> frees from the tail. Free unreferenced dquots in LRU order because it
> seems more reasonable than freeing most recently used.
> 
> Signed-off-by: Greg Thelen <gthelen@...gle.com>
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>

Thanks. I've added the patch to my tree.

								Honza

> ---
>  fs/quota/dquot.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
> index d88231e3b2be..241b00f835b9 100644
> --- a/fs/quota/dquot.c
> +++ b/fs/quota/dquot.c
> @@ -716,7 +716,7 @@ dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
>  	unsigned long freed = 0;
>  
>  	spin_lock(&dq_list_lock);
> -	head = free_dquots.prev;
> +	head = free_dquots.next;
>  	while (head != &free_dquots && sc->nr_to_scan) {
>  		dquot = list_entry(head, struct dquot, dq_free);
>  		remove_dquot_hash(dquot);
> @@ -725,7 +725,7 @@ dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
>  		do_destroy_dquot(dquot);
>  		sc->nr_to_scan--;
>  		freed++;
> -		head = free_dquots.prev;
> +		head = free_dquots.next;
>  	}
>  	spin_unlock(&dq_list_lock);
>  	return freed;
> -- 
> 2.18.0.rc1.242.g61856ae69a-goog
> 
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR