From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Minchan Kim <minchan.kim@gmail.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Milton Miller <miltonm@bga.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>, Johannes Weiner <hannes@cmpxchg.org>,
Kukjin Kim <kgene.kim@samsung.com>
Subject: Re: [PATCH] Tight check of pfn_valid on sparsemem - v4
Date: Thu, 29 Jul 2010 22:13:10 +0100 [thread overview]
Message-ID: <20100729211310.GA28330@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <alpine.DEB.2.00.1007291438290.21024@router.home>
On Thu, Jul 29, 2010 at 02:55:53PM -0500, Christoph Lameter wrote:
> On Thu, 29 Jul 2010, Russell King - ARM Linux wrote:
>
> > And no, setting the sparse section size to 512kB doesn't work - memory is
> > offset by 256MB already, so you need a sparsemem section array of 1024
> > entries just to cover that - with the full 256MB populated, that's 512
> > unused entries followed by 512 used entries. That too is going to waste
> > memory like nobodies business.
>
> SPARSEMEM EXTREME does not handle that?
>
> Some ARMs seem to have MMUs. If so then use SPARSEMEM_VMEMMAP. You can map
> 4k pages for the mmap through a page table. Redirect unused 4k blocks to
> the NULL page.
We're going over old ground which has already been covered in this very
thread. I've no compunction to repeat the arguments.
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next prev parent reply other threads:[~2010-07-29 21:14 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-26 15:46 [PATCH] Tight check of pfn_valid on sparsemem - v4 Minchan Kim
2010-07-26 16:40 ` Christoph Lameter
2010-07-26 22:47 ` Minchan Kim
[not found] ` <pfn.valid.v4.reply.1@mdm.bga.com>
[not found] ` <AANLkTimtTVvorrR9pDVTyPKj0HbYOYY3aR7B-QWGhTei@mail.gmail.com>
2010-07-27 8:12 ` Milton Miller
2010-07-27 8:13 ` KAMEZAWA Hiroyuki
2010-07-27 10:01 ` Minchan Kim
2010-07-27 14:34 ` Christoph Lameter
2010-07-27 22:33 ` Minchan Kim
2010-07-28 15:14 ` Christoph Lameter
2010-07-28 15:56 ` Minchan Kim
2010-07-28 17:02 ` Christoph Lameter
2010-07-28 22:57 ` Minchan Kim
2010-07-29 15:46 ` Christoph Lameter
2010-07-29 16:18 ` Minchan Kim
2010-07-29 16:47 ` Christoph Lameter
2010-07-29 17:03 ` Minchan Kim
2010-07-29 17:30 ` Christoph Lameter
2010-07-29 18:33 ` Russell King - ARM Linux
2010-07-29 19:55 ` Christoph Lameter
2010-07-29 21:13 ` Russell King - ARM Linux [this message]
2010-07-29 20:55 ` Dave Hansen
2010-07-29 22:14 ` Russell King - ARM Linux
2010-07-29 22:28 ` Christoph Lameter
2010-07-30 0:38 ` Dave Hansen
2010-07-30 9:43 ` Minchan Kim
2010-07-30 12:48 ` Christoph Lameter
2010-07-30 15:43 ` Dave Hansen
2010-07-31 15:30 ` Russell King - ARM Linux
2010-08-02 15:48 ` Christoph Lameter
2010-07-30 9:32 ` Minchan Kim
2010-07-31 10:38 ` Russell King - ARM Linux
2010-08-11 15:31 ` Dave Hansen
2010-07-27 9:56 ` Minchan Kim
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