linux-kernel - Re: [PATCH 1/3] mm: thp: make deferred split shrinker memcg aware

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Message-ID: <20190530120718.52xuxgezkzsmaxqi@box>
Date:   Thu, 30 May 2019 15:07:18 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     ktkhai@...tuozzo.com, hannes@...xchg.org, mhocko@...e.com,
        kirill.shutemov@...ux.intel.com, hughd@...gle.com,
        shakeelb@...gle.com, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mm: thp: make deferred split shrinker memcg aware

On Tue, May 28, 2019 at 08:44:22PM +0800, Yang Shi wrote:
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index bc74d6a..9ff5fab 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -316,6 +316,12 @@ struct mem_cgroup {
>  	struct list_head event_list;
>  	spinlock_t event_list_lock;
>  
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +	struct list_head split_queue;
> +	unsigned long split_queue_len;
> +	spinlock_t split_queue_lock;

Maybe we should wrap there into a struct and have helper that would return
pointer to the struct which is right for the page: from pgdat or from
memcg, depending on the situation?

This way we will be able to kill most of code duplication, right?

-- 
 Kirill A. Shutemov