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

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Message-ID: <4A414F55.2040808@redhat.com>
Date:	Tue, 23 Jun 2009 17:55:33 -0400
From:	Rik van Riel <riel@...hat.com>
To:	akataria@...are.com
CC:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Mel Gorman <mel@....ul.ie>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] Hugepages should be accounted as unevictable pages.

Alok Kataria wrote:
> On Tue, 2009-06-23 at 14:24 -0700, Rik van Riel wrote:

>> I can see something reasonable on both sides of this
>> particular debate.  However, even with this patch the
>> "unevictable" statistic does not reclaim the total
>> number of pages that are unevictable pages from a
>> zone, so I am not sure how it helps you achieve your
>> goal.
> 
> Yes but most of the other memory (page table and others) which is
> unevictable is actually static in nature.  IOW, the amount of this other
> kind of kernel unevictable pages can be actually interpolated from the
> amount of physical memory on the system. 

That would be a fair argument, if it were true.

Things like page tables and dentry/inode caches vary
according to the use case and are allocated as needed.
They are in no way "static in nature".

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