linux-kernel - Re: What means Hugepage? 8KiB,16KiB,..,2MiB or 4MiB?

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Message-ID: <47E983E3.4050806@zytor.com>
Date:	Tue, 25 Mar 2008 15:59:47 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"J.C. Pizarro" <jcpiza@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: What means Hugepage? 8KiB,16KiB,..,2MiB or 4MiB?

J.C. Pizarro wrote:
> What means Hugepage?
> 
> Does it mean 8KiB? 16KiB? 32KiB? 64KiB? 2MiB? 4MiB?
> 
> The real page sizes of x86 and x86-64 are 4 KiB for this linux kernel.
> 
> But the page sizes can be soft 8 KiB or 16 KiB or 32 KiB or 64 KiB
> if it is implemented in the memory manager of the kernel.
> 
> But too they exist real page sizes of 2 MiB and 4 MiB that they have
> some reserved entries of TLB in the specs of Intel/AMD processors
> for these gigant pages.

On x86, it means 2/4 MiB, or even 1 GiB in some very strange 
circumstances.  Other architectures might be different.

	-hpa
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