linux-kernel - Re: [PATCH] mm: vmscan: fix the page state calculation in too_many

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Message-ID: <20150113160940.GD8180@phnom.home.cmpxchg.org>
Date:	Tue, 13 Jan 2015 11:09:40 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Vinayak Menon <vinmenon@...eaurora.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, vdavydov@...allels.com, mhocko@...e.cz,
	mgorman@...e.de, minchan@...nel.org
Subject: Re: [PATCH] mm: vmscan: fix the page state calculation in
 too_many_isolated

On Tue, Jan 13, 2015 at 04:37:27PM +0530, Vinayak Menon wrote:
> @@ -1392,6 +1392,44 @@ int isolate_lru_page(struct page *page)
>  	return ret;
>  }
>  
> +static int __too_many_isolated(struct zone *zone, int file,
> +	struct scan_control *sc, int safe)
> +{
> +	unsigned long inactive, isolated;
> +
> +	if (file) {
> +		if (safe) {
> +			inactive = zone_page_state_snapshot(zone,
> +					NR_INACTIVE_FILE);
> +			isolated = zone_page_state_snapshot(zone,
> +					NR_ISOLATED_FILE);
> +		} else {
> +			inactive = zone_page_state(zone, NR_INACTIVE_FILE);
> +			isolated = zone_page_state(zone, NR_ISOLATED_FILE);
> +		}
> +	} else {
> +		if (safe) {
> +			inactive = zone_page_state_snapshot(zone,
> +					NR_INACTIVE_ANON);
> +			isolated = zone_page_state_snapshot(zone,
> +					NR_ISOLATED_ANON);
> +		} else {
> +			inactive = zone_page_state(zone, NR_INACTIVE_ANON);
> +			isolated = zone_page_state(zone, NR_ISOLATED_ANON);
> +		}
> +	}

	if (safe) {
		inactive = zone_page_state_snapshot(zone, NR_INACTIVE_ANON + 2*file)
		isolated = zone_page_state_snapshot(zone, NR_ISOLATED_ANON + file)
	} else {
		inactive = zone_page_state(zone, NR_INACTIVE_ANON + 2*file)
		isolated = zone_page_state(zone, NR_ISOLATED_ANON + file)
	}
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