From: Dave Hansen <haveblue@us.ibm.com>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-mm <linux-mm@kvack.org>
Subject: Re: sparsemem & sparsemem extreme question
Date: Wed, 05 Oct 2005 09:05:40 -0700 [thread overview]
Message-ID: <1128528340.26009.8.camel@localhost> (raw)
In-Reply-To: <20051005155823.GA10119@osiris.ibm.com>
On Wed, 2005-10-05 at 17:58 +0200, Heiko Carstens wrote:
> we have the 1:1 mapping already
> today. So adding anything to the vmalloc area won't make it more expensive.
The pagetables themselves have a cost, as do the lookups. Those make it
more expensive. On 64-bit machines the vaddr space is not an expense.
> No, my concern is actually that the s390 archticture actually will come up
> with some sort of memory that's present in the physical address space where
> the most significant bit of the addresses will be turned _on_.
Why do you think this?
-- Dave
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next prev parent reply other threads:[~2005-10-05 16:03 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-04 6:50 sparsemem & sparsemem extreme question Heiko Carstens
2005-10-04 14:33 ` Andy Whitcroft
2005-10-04 16:15 ` Dave Hansen
2005-10-05 6:39 ` Heiko Carstens
2005-10-05 15:52 ` Dave Hansen
2005-10-05 15:58 ` Heiko Carstens
2005-10-05 16:05 ` Dave Hansen [this message]
2005-10-05 16:10 ` Heiko Carstens
2005-10-05 16:20 ` Dave Hansen
2005-10-05 17:12 ` Heiko Carstens
2005-10-05 17:20 ` Dave Hansen
2005-10-05 17:45 ` Heiko Carstens
2005-10-05 17:57 ` Dave Hansen
2005-10-05 18:04 ` Heiko Carstens
2005-10-05 18:42 ` Bob Picco
2005-10-05 22:06 ` Dave Hansen
2005-10-06 7:39 ` Heiko Carstens
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