linux-kernel - Re: [PATCH 5/5] mm: workingset: per-cgroup cache thrash detection

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Date:	Wed, 27 Jan 2016 17:58:27 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<kernel-team@...com>
Subject: Re: [PATCH 5/5] mm: workingset: per-cgroup cache thrash detection

On Tue, Jan 26, 2016 at 04:00:06PM -0500, Johannes Weiner wrote:
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index b14a2bb33514..1cf3065c143b 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -317,6 +317,7 @@ extern void lru_cache_add_active_or_unevictable(struct page *page,
>  
>  /* linux/mm/vmscan.c */
>  extern unsigned long zone_reclaimable_pages(struct zone *zone);
> +extern unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru);

Better declare it in mm/internal.h? And is there any point in renaming
it?

> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 953f0f984392..864e237f32d9 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -202,11 +207,20 @@ static void unpack_shadow(void *shadow, struct zone **zonep,
>   */
>  void *workingset_eviction(struct address_space *mapping, struct page *page)
>  {
> +	struct mem_cgroup *memcg = page_memcg(page);
>  	struct zone *zone = page_zone(page);
> +	int memcgid = mem_cgroup_id(memcg);

This will crash in case memcg is disabled via boot param.

Thanks,
Vladimir