From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Ingo Molnar <mingo@redhat.com>, Andrew Morton <akpm@digeo.com>
Cc: Andrea Arcangeli <andrea@suse.de>,
mingo@elte.hu, hugh@veritas.com, dmccr@us.ibm.com,
Linus Torvalds <torvalds@transmeta.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: objrmap and vmtruncate
Date: Tue, 22 Apr 2003 07:32:36 -0700 [thread overview]
Message-ID: <171070000.1051021955@[10.10.2.4]> (raw)
In-Reply-To: <Pine.LNX.4.44.0304220618190.24063-100000@devserv.devel.redhat.com>
> It also makes it easy to calculate the overhead of the pte chains: twice
> the amount of pagetable overhead. Ie. with 32-bit pte's it's +8 bytes
> overhead, or +0.2% of RAM overhead per mapped page, using a 4K page. With
> 64-bit ptes on 32-bit platforms (PAE), the overhead is still 8 bytes. On
> 64-bit platforms using 8K pages the overhead is still +0.2% of RAM, in
> additionl to the 0.1% of RAM overhead for the pte itself. The worst-case
> is 64-bit platforms with a 4K pagesize, there the overhead is +0.4% of
> RAM, in addition to the 0.2% overhead caused by the pte itself.
Oh, BTW. You're assuming no sharing of any pages in the above. Look what
happens if 1000 processes share the same page ...
M.
next prev parent reply other threads:[~2003-04-22 14:20 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-04 14:34 Hugh Dickins
2003-04-04 16:14 ` William Lee Irwin III
2003-04-04 16:29 ` Hugh Dickins
2003-04-04 18:54 ` Andrew Morton
2003-04-04 21:43 ` Hugh Dickins
2003-04-04 21:45 ` Andrea Arcangeli
2003-04-04 21:58 ` Benjamin LaHaise
2003-04-04 23:07 ` Andrew Morton
2003-04-05 0:03 ` Andrea Arcangeli
2003-04-05 0:31 ` Andrew Morton
2003-04-05 1:31 ` Andrea Arcangeli
2003-04-05 1:52 ` Benjamin LaHaise
2003-04-05 2:22 ` Andrea Arcangeli
2003-04-05 10:01 ` Jamie Lokier
2003-04-05 10:11 ` William Lee Irwin III
2003-04-05 2:06 ` Andrew Morton
2003-04-05 2:24 ` Andrea Arcangeli
2003-04-05 2:13 ` Martin J. Bligh
2003-04-05 2:44 ` Andrea Arcangeli
2003-04-05 3:24 ` Andrew Morton
2003-04-05 12:06 ` Andrew Morton
2003-04-05 15:11 ` Martin J. Bligh
[not found] ` <20030405161758.1ee19bfa.akpm@digeo.com>
2003-04-06 7:07 ` William Lee Irwin III
2003-04-05 16:30 ` Andrea Arcangeli
2003-04-05 19:01 ` Andrea Arcangeli
2003-04-05 20:14 ` Andrew Morton
2003-04-05 21:24 ` Andrew Morton
2003-04-05 22:06 ` Andrea Arcangeli
2003-04-05 22:31 ` Andrew Morton
2003-04-05 23:10 ` Andrea Arcangeli
2003-04-06 1:58 ` Andrew Morton
2003-04-06 14:47 ` Andrea Arcangeli
2003-04-06 21:35 ` William Lee Irwin III
2003-04-06 7:38 ` William Lee Irwin III
2003-04-06 14:51 ` Andrea Arcangeli
2003-04-06 12:37 ` Jamie Lokier
2003-04-06 13:12 ` William Lee Irwin III
2003-04-22 11:00 ` Ingo Molnar
2003-04-22 11:54 ` William Lee Irwin III
2003-04-22 14:31 ` Ingo Molnar
2003-04-22 14:56 ` William Lee Irwin III
2003-04-22 15:26 ` Ingo Molnar
2003-04-22 16:20 ` William Lee Irwin III
2003-04-22 16:57 ` Andrea Arcangeli
2003-04-22 17:21 ` William Lee Irwin III
2003-04-22 18:08 ` Andrea Arcangeli
2003-04-22 17:34 ` Ingo Molnar
2003-04-22 18:04 ` Benjamin LaHaise
2003-04-22 16:58 ` Martin J. Bligh
2003-04-22 12:37 ` Andrea Arcangeli
2003-04-22 13:20 ` William Lee Irwin III
2003-04-22 14:38 ` Martin J. Bligh
2003-04-22 15:10 ` William Lee Irwin III
2003-04-22 15:53 ` Martin J. Bligh
2003-04-22 14:52 ` Andrea Arcangeli
2003-04-22 14:29 ` Martin J. Bligh
2003-04-22 15:07 ` Ingo Molnar
2003-04-22 15:42 ` William Lee Irwin III
2003-04-22 15:55 ` Ingo Molnar
2003-04-22 16:58 ` William Lee Irwin III
2003-04-22 17:07 ` Ingo Molnar
2003-04-22 15:16 ` Andrea Arcangeli
2003-04-22 15:49 ` Ingo Molnar
2003-04-22 16:16 ` Martin J. Bligh
2003-04-22 17:24 ` Ingo Molnar
2003-04-22 17:45 ` John Bradford
2003-04-22 14:32 ` Martin J. Bligh [this message]
2003-04-22 15:09 ` Ingo Molnar
2003-04-05 21:34 ` Rik van Riel
2003-04-06 9:29 ` Benjamin LaHaise
2003-04-05 23:25 ` William Lee Irwin III
2003-04-05 23:57 ` Andrew Morton
2003-04-06 0:14 ` Andrea Arcangeli
2003-04-06 1:39 ` Andrew Morton
2003-04-06 2:13 ` William Lee Irwin III
2003-04-06 9:26 ` Benjamin LaHaise
2003-04-06 9:41 ` William Lee Irwin III
2003-04-06 9:54 ` William Lee Irwin III
2003-04-06 2:23 ` Martin J. Bligh
2003-04-06 3:55 ` Andrew Morton
2003-04-06 3:08 ` Martin J. Bligh
2003-04-06 7:42 ` William Lee Irwin III
2003-04-06 14:49 ` Alan Cox
2003-04-06 16:13 ` Martin J. Bligh
2003-04-06 21:34 ` subobj-rmap Martin J. Bligh
2003-04-06 21:42 ` subobj-rmap Rik van Riel
2003-04-06 21:52 ` subobj-rmap Davide Libenzi
2003-04-06 21:55 ` subobj-rmap Jamie Lokier
2003-04-06 22:39 ` subobj-rmap William Lee Irwin III
2003-04-06 22:03 ` subobj-rmap Martin J. Bligh
2003-04-06 22:06 ` subobj-rmap Martin J. Bligh
2003-04-06 22:15 ` subobj-rmap Andrea Arcangeli
2003-04-06 22:25 ` subobj-rmap Martin J. Bligh
2003-04-07 21:25 ` subobj-rmap Andrea Arcangeli
2003-04-06 23:06 ` subobj-rmap Jamie Lokier
2003-04-06 23:26 ` subobj-rmap Martin J. Bligh
2003-04-05 3:45 ` objrmap and vmtruncate Martin J. Bligh
2003-04-05 3:59 ` Rik van Riel
2003-04-05 4:10 ` William Lee Irwin III
2003-04-05 4:49 ` Martin J. Bligh
2003-04-05 13:31 ` Rik van Riel
2003-04-05 4:52 ` Martin J. Bligh
2003-04-05 3:22 ` Andrew Morton
2003-04-05 3:35 ` Martin J. Bligh
2003-04-05 3:53 ` Rik van Riel
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