linux-kernel - Re: [RFC][PATCH 4/5] memory_pressure

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Message-Id: <20080115110631.4cab1e65.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 15 Jan 2008 11:06:31 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Marcelo Tosatti <marcelo@...ck.org>,
	Daniel Spang <daniel.spang@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 4/5] memory_pressure_notify() caller

On Tue, 15 Jan 2008 10:02:30 +0900
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> +
> +	notify_threshold = (zone->pages_high +
> +			    zone->lowmem_reserve[MAX_NR_ZONES-1]) * 2;
> +
Why MAX_NR_ZONES-1 ?


> +	if (unlikely((prev_free <= notify_threshold) &&
> +		     (zone_page_state(zone, NR_FREE_PAGES) > notify_threshold)))
> +		memory_pressure_notify(zone, 0);
>  }

How about this
==
if (unlikely(zone->mem_notify_status && ...) 


Thanks,
-Kame

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