linux-kernel - Re: PAGE_SIZE Availability Inconsistency

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Message-ID: <m1slc1vx8u.fsf@ebiederm.dsl.xmission.com>
Date:	Mon, 19 Mar 2007 13:39:29 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Avi Kivity <avi@...o.co.il>, David Miller <davem@...emloft.net>,
	dmlb2000@...il.com, linux-kernel@...r.kernel.org
Subject: Re: PAGE_SIZE Availability Inconsistency

"H. Peter Anvin" <hpa@...or.com> writes:

> Avi Kivity wrote:
>>>
>>> It definitely should, especially on x86-64, where the page size isn't
>>> guaranteed by the ABI (on i386, the ABI guarantees a 4K page size; on x86-64
>>> it can be up to 64K.)
>>
>> Wouldn't that be ia64?
>
> No, the x86-64 EFI ABI permits page sizes up to 64K.  Currently, of course, the
> only page size in use is 4K, but unlike i386 that's not guaranteed by the ABI.
> At least AMD has indicated that they are considering introducing larger page
> size support in future hardware.

EFI ABI?  Don't you mean the SYSV ABI right.

That does seem to indicate that 64K is an option.  And at a quick
glance glibc is using 1M alignment on program segments so it
looks like there is at least a reasonable chance of being able
to make the transition to a bigger page size for user space.

Eric
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