linux-kernel - Re: [PATCH] Documentation: vm: Add 1GB large page support information

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Message-ID: <871tphtftg.fsf@tassilo.jf.intel.com>
Date:	Wed, 05 Nov 2014 14:58:51 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	Masanari Iida <standby24x7@...il.com>,
	Jonathan Corbet <corbet@....net>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, lcapitulino@...hat.com
Subject: Re: [PATCH] Documentation: vm: Add 1GB large page support information

Dave Hansen <dave.hansen@...el.com> writes:

> On 11/05/2014 07:21 AM, Masanari Iida wrote:
>> Luiz, Dave,
>> Thanks for comments.
>> 
>> I understand that there are some exception cases which doesn't support 1G
>> large pages on newer CPUs.
>> I like Dave's example, at the same time I would like to add "pdpe1gb flag" in
>> the document.
>> 
>> For example, x86 CPUs normally support 4K and 2M (1G if pdpe1gb flag exist).
>
> Is 1G supported on CPUs that have pdpe1gb and are running a 32-bit kernel?

No, 1GB pages is a 64bit only feature.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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