linux-kernel - Re: [PATCH] Hugepages should be accounted as unevictable pages.

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Message-Id: <1245795352.17685.31312.camel@nimitz>
Date:	Tue, 23 Jun 2009 15:15:52 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	akataria@...are.com
Cc:	Rik van Riel <riel@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Mel Gorman <mel@....ul.ie>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] Hugepages should be accounted as unevictable pages.

On Tue, 2009-06-23 at 14:42 -0700, Alok Kataria wrote:
> One thing that i forgot to mention earlier is that, I just need a way to
> provide a hint about the total locked memory  on the system and it
> doesn't need to be the exact number at that point in time.
> 
> Lee, due to this reason lazy culling of unevictable pages is fine too. 
> 
> Hugepages, similar to mlocked pages, are special because the user could
> specify how much memory it wants to reserve for this purpose. So that
> needs to be taken into consideration i.e it cannot be calculated in some
> way. 

Could you just teach the thing to which you are hinting that it also
needs to go look in sysfs for huge page counts?  Or, is there a
requirement that it come out of a single meminfo field?

-- Dave

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