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

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Message-ID: <4A415D62.20109@redhat.com>
Date:	Tue, 23 Jun 2009 18:55:30 -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 14:55 -0700, Rik van Riel wrote:
>> Alok Kataria wrote:
>>> On Tue, 2009-06-23 at 14:24 -0700, Rik van Riel wrote:

>> 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".
> 
> Maybe static was the wrong word to use here. 
> What i meant was that you could always calculate the *maximum* amount of
> memory that is going to be used by page table and can also determine the
> % of memory that will be used by slab caches.

My point is that you cannot do that.

We have seen systems with 30% of physical memory in
page tables, as well as systems with a similar amount
of memory in the slab cache.

Yes, these were running legitimate workloads.

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