Re: PAGE_SIZE Availability Inconsistency

[Eric W. Biederman]

"H. Peter Anvin" <hpa@xxxxxxxxx> 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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