From: Rik van Riel <riel@redhat.com>
To: akataria@vmware.com
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
LKML <linux-kernel@vger.kernel.org>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Dave Hansen <dave@linux.vnet.ibm.com>, Mel Gorman <mel@csn.ul.ie>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH] Hugepages should be accounted as unevictable pages.
Date: Tue, 23 Jun 2009 18:55:30 -0400 [thread overview]
Message-ID: <4A415D62.20109@redhat.com> (raw)
In-Reply-To: <1245794811.24110.41.camel@alok-dev1>
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.
--
All rights reversed.
WARNING: multiple messages have this Message-ID (diff)
From: Rik van Riel <riel@redhat.com>
To: akataria@vmware.com
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
LKML <linux-kernel@vger.kernel.org>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Dave Hansen <dave@linux.vnet.ibm.com>, Mel Gorman <mel@csn.ul.ie>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH] Hugepages should be accounted as unevictable pages.
Date: Tue, 23 Jun 2009 18:55:30 -0400 [thread overview]
Message-ID: <4A415D62.20109@redhat.com> (raw)
In-Reply-To: <1245794811.24110.41.camel@alok-dev1>
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.
--
All rights reversed.
--
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next prev parent reply other threads:[~2009-06-23 22:56 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-22 21:25 [PATCH] Hugepages should be accounted as unevictable pages Alok Kataria
2009-06-22 21:25 ` Alok Kataria
2009-06-23 3:25 ` KOSAKI Motohiro
2009-06-23 3:25 ` KOSAKI Motohiro
2009-06-23 4:46 ` Alok Kataria
2009-06-23 4:46 ` Alok Kataria
2009-06-23 5:05 ` KOSAKI Motohiro
2009-06-23 5:05 ` KOSAKI Motohiro
2009-06-23 5:11 ` KAMEZAWA Hiroyuki
2009-06-23 5:11 ` KAMEZAWA Hiroyuki
2009-06-23 5:54 ` Alok Kataria
2009-06-23 5:54 ` Alok Kataria
2009-06-23 6:06 ` KAMEZAWA Hiroyuki
2009-06-23 6:06 ` KAMEZAWA Hiroyuki
2009-06-23 19:28 ` Alok Kataria
2009-06-23 19:28 ` Alok Kataria
2009-06-23 20:30 ` Lee Schermerhorn
2009-06-23 20:30 ` Lee Schermerhorn
2009-06-23 21:24 ` Rik van Riel
2009-06-23 21:24 ` Rik van Riel
2009-06-23 21:42 ` Alok Kataria
2009-06-23 21:42 ` Alok Kataria
2009-06-23 21:55 ` Rik van Riel
2009-06-23 21:55 ` Rik van Riel
2009-06-23 22:06 ` Alok Kataria
2009-06-23 22:06 ` Alok Kataria
2009-06-23 22:19 ` Dave Hansen
2009-06-23 22:19 ` Dave Hansen
2009-06-23 22:55 ` Rik van Riel [this message]
2009-06-23 22:55 ` Rik van Riel
2009-06-23 23:28 ` Alok Kataria
2009-06-23 23:28 ` Alok Kataria
2009-06-23 23:48 ` Dave Hansen
2009-06-23 23:48 ` Dave Hansen
2009-06-23 22:15 ` Dave Hansen
2009-06-23 22:15 ` Dave Hansen
2009-06-23 22:23 ` Alok Kataria
2009-06-23 22:23 ` Alok Kataria
2009-06-23 23:41 ` Dave Hansen
2009-06-23 23:41 ` Dave Hansen
2009-06-24 0:08 ` Alok Kataria
2009-06-24 0:08 ` Alok Kataria
2009-06-23 12:26 ` Lee Schermerhorn
2009-06-23 12:26 ` Lee Schermerhorn
2009-06-29 9:58 ` Mel Gorman
2009-06-29 9:58 ` Mel Gorman
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