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

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Message-ID: <5492F474.5090606@intel.com>
Date:	Thu, 18 Dec 2014 07:36:20 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	Fenghua Yu <fenghua.yu@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Glenn Williamson <glenn.p.williamson@...el.com>,
	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

On 12/18/2014 06:52 AM, Christoph Lameter wrote:
> On Wed, 17 Dec 2014, Dave Hansen wrote:
>> > IOW, do *ALL* of the sl*b allocators in all of their forms with all of
>> > their debugging options guarantee 32-byte alignment when allocating
>> > 256-byte objects?
> No. For that the arch has to set a macro call ARCH_KMALLOC_MINALIGN or
> ARCH_DMA_MINALIGN. Default alignment is to a word boundary.

OK, sounds like this is going to need its own slab.  It will make the
patch a bit bigger but shouldn't be all that much more complicated.

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