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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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