From: bill4carson@gmail.com (bill4carson)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC] ARM hugetlb support
Date: Wed, 01 Feb 2012 09:56:50 +0800 [thread overview]
Message-ID: <4F289BE2.9020404@gmail.com> (raw)
In-Reply-To: <CAHkRjk6xZy3Nsy=R05664RM0Sw071rkXmV2g9ySwqiS_BrBLrw@mail.gmail.com>
On 2012?01?31? 17:29, Catalin Marinas wrote:
> Hi,
>
> On 30 January 2012 07:57,<bill4carson@gmail.com> wrote:
>> This patch aims to support huge page for ARM. For now, 2MB(two 1MB page)/16MB
>> huge page are supported, Versatile Express Cortex-A9x4 tile is used as test
>> board. Verifications are running with libhugetlbfs and ltp.
> I haven't reviewed your patches yet but just a few thoughts. Do you
> have a clear case where 16MB super-sections is needed? Do you have
> memory beyond 4G that can only be accessed with super-sections? This
> is an optional feature and not all processors have it.
The initial support only focus on ARMv7 based processor like cortex A9,
basically that's
what I got in my hand, one Versatile Express Cortex-A9x4 tile board.
> It also doesn't
> help much with the TLB hit rate since the micro-TLB most likely only
> support 1MB sections.
>
I am afraid I can't agree with you on this.
Truly there is no specific statement about whether micro-TLB support
16MB super-sections,
but main-TLB actually helps the hit rate, and main-TLB support all page
size mapping.
> BTW, I have a (simpler) implementation of hugetlbfs with 2MB sections
> but for LPAE only:
>
> http://git.kernel.org/?p=linux/kernel/git/cmarinas/linux-arm-arch.git;a=shortlog;h=refs/heads/hugetlb
>
Thanks for your information, I will study your code carefully :)
--
I am a slow learner
but I will keep trying to fight for my dreams!
--bill
next prev parent reply other threads:[~2012-02-01 1:56 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-30 7:57 [RFC] ARM hugetlb support bill4carson at gmail.com
2012-01-30 7:57 ` [PATCH 1/7] Add various hugetlb arm high level hooks bill4carson at gmail.com
2012-02-06 17:07 ` Catalin Marinas
2012-02-07 2:00 ` bill4carson
2012-02-07 11:54 ` Catalin Marinas
2012-02-07 12:15 ` Catalin Marinas
2012-02-07 12:57 ` carson bill
2012-01-30 7:57 ` [PATCH 2/7] Add various hugetlb page table fix bill4carson at gmail.com
2012-01-31 9:57 ` Catalin Marinas
2012-01-31 9:58 ` Russell King - ARM Linux
2012-01-31 12:25 ` Catalin Marinas
2012-02-01 3:10 ` bill4carson
2012-02-06 16:26 ` Catalin Marinas
2012-02-07 1:42 ` bill4carson
2012-02-07 11:50 ` Catalin Marinas
2012-02-07 13:24 ` carson bill
2012-02-07 14:11 ` Catalin Marinas
2012-02-07 14:46 ` carson bill
2012-02-07 15:09 ` Catalin Marinas
2012-02-07 15:41 ` carson bill
2012-01-30 7:57 ` [PATCH 3/7] Introduce set_hugepte_ext api for huge page hardware page table setup bill4carson at gmail.com
2012-01-30 7:57 ` [PATCH 4/7] Store huge page linux pte in mm_struct bill4carson at gmail.com
2012-01-31 9:37 ` Catalin Marinas
2012-01-31 10:01 ` Russell King - ARM Linux
2012-02-01 5:45 ` bill4carson
2012-02-06 2:04 ` bill4carson
2012-02-06 10:29 ` Catalin Marinas
2012-02-06 14:40 ` carson bill
2012-01-30 7:57 ` [PATCH 5/7] Using do_page_fault for section fault handling bill4carson at gmail.com
2012-01-30 7:57 ` [PATCH 6/7] Add hugetlb Kconfig option bill4carson at gmail.com
2012-01-30 7:57 ` [PATCH 7/7] Minor compiling fix bill4carson at gmail.com
2012-01-31 9:29 ` [RFC] ARM hugetlb support Catalin Marinas
2012-02-01 1:56 ` bill4carson [this message]
2012-02-02 14:38 ` Catalin Marinas
2012-02-03 1:41 ` bill4carson
2012-02-06 16:29 ` Catalin Marinas
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