From: Laura Abbott <lauraa@codeaurora.org>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org
Subject: Re: [RFC 0/4] Intermix Lowmem and vmalloc
Date: Mon, 11 Nov 2013 17:24:12 -0800 [thread overview]
Message-ID: <5281833C.4010006@codeaurora.org> (raw)
In-Reply-To: <20131112001315.GD16735@n2100.arm.linux.org.uk>
On 11/11/2013 4:13 PM, Russell King - ARM Linux wrote:
> On Mon, Nov 11, 2013 at 03:26:48PM -0800, Laura Abbott wrote:
>> Hi,
>>
>> This is an RFC for a feature to allow lowmem and vmalloc virtual address space
>> to be intermixed. This has currently only been tested on a narrow set of ARM
>> chips.
>>
>> Currently on 32-bit systems we have
>>
>>
>> Virtual Physical
>>
>> PAGE_OFFSET +--------------+ PHYS_OFFSET +------------+
>> | | | |
>> | | | |
>> | | | |
>> | lowmem | | direct |
>> | | | mapped |
>> | | | |
>> | | | |
>> | | | |
>> +--------------+------------------>x------------>
>> | | | |
>> | | | |
>> | | | not-direct|
>> | | | mapped |
>> | vmalloc | | |
>> | | | |
>> | | | |
>> | | | |
>> +--------------+ +------------+
>>
>> Where part of the virtual spaced above PHYS_OFFSET is reserved for direct
>> mapped lowmem and part of the virtual address space is reserved for vmalloc.
>
> Minor nit...
>
> ITYM PAGE_OFFSET here. vmalloc space doesn't exist in physical memory.
>
Yes, that is a typo.
Thanks,
Laura
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prev parent reply other threads:[~2013-11-12 1:24 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-11 23:26 [RFC 0/4] Intermix Lowmem and vmalloc Laura Abbott
2013-11-11 23:26 ` [RFC PATCH 1/4] arm: mm: Add iotable_init_novmreserve Laura Abbott
2013-11-11 23:26 ` [RFC PATCH 2/4] arm: mm: Track lowmem in vmalloc Laura Abbott
2013-11-11 23:26 ` [RFC PATCH 3/4] mm/vmalloc.c: Allow lowmem to be tracked " Laura Abbott
2013-11-11 23:37 ` Kyungmin Park
2013-11-12 1:23 ` Laura Abbott
2013-11-14 17:45 ` Dave Hansen
2013-11-15 4:52 ` Laura Abbott
2013-11-15 15:53 ` Dave Hansen
2013-11-26 22:45 ` Andrew Morton
2013-12-03 4:59 ` Laura Abbott
2013-11-11 23:26 ` [RFC PATCH 4/4] mm/vmalloc.c: Treat the entire kernel virtual space as vmalloc Laura Abbott
2013-11-14 17:26 ` Dave Hansen
2013-11-15 5:34 ` Laura Abbott
2013-11-12 0:13 ` [RFC 0/4] Intermix Lowmem and vmalloc Russell King - ARM Linux
2013-11-12 1:24 ` Laura Abbott [this message]
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