linux-kernel - Re: [PATCH v2] X86-32: Allocate 256 bytes for pgd in PAE paging

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Message-ID: <5493162E.7060305@zytor.com>
Date:	Thu, 18 Dec 2014 10:00:14 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	"Williamson, Glenn P" <glenn.p.williamson@...el.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v2] X86-32: Allocate 256 bytes for pgd in PAE paging

>> 4*8 = 32 bytes, where did 256 bytes come from?
> 
> You are right. It should be 32 bytes. I will change the wording in future patch. The real calculation in code is right though.

I don't know if it makes sense to round up to a cache line.  My
suspicion is that it won't matter, as these fields will be read-mostly,
on the other hand, wasting 32 bytes isn't exactly a problem, either.

	-hpa


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