linux-kernel - Re: [PATCH] vmscan: evict use-once pages first (v2)

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Date:	Thu, 30 Apr 2009 01:07:51 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Elladan <elladan@...imo.com>, linux-kernel@...r.kernel.org,
	tytso@....edu, linux-mm@...ck.org
Subject: Re: [PATCH] vmscan: evict use-once pages first (v2)

Hi

Looks good than previous version. but I have one question.

> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index eac9577..4471dcb 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1489,6 +1489,18 @@ static void shrink_zone(int priority, struct zone *zone,
>                        nr[l] = scan;
>        }
>
> +       /*
> +        * When the system is doing streaming IO, memory pressure here
> +        * ensures that active file pages get deactivated, until more
> +        * than half of the file pages are on the inactive list.
> +        *
> +        * Once we get to that situation, protect the system's working
> +        * set from being evicted by disabling active file page aging.
> +        * The logic in get_scan_ratio protects anonymous pages.
> +        */
> +       if (nr[LRU_INACTIVE_FILE] > nr[LRU_ACTIVE_FILE])
> +               nr[LRU_ACTIVE_FILE] = 0;
> +
>        while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
>                                        nr[LRU_INACTIVE_FILE]) {
>                for_each_evictable_lru(l) {

we handle active_anon vs inactive_anon ratio by shrink_list().
Why do you insert this logic insert shrink_zone() ?
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