From: Dave Hansen <dave.hansen@intel.com>
To: Christoph Lameter <cl@linux.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@linux.intel.com>,
Ingo Molnar <mingo@elte.hu>,
Glenn Williamson <glenn.p.williamson@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH v2] X86-32: Allocate 256 bytes for pgd in PAE paging
Date: Thu, 18 Dec 2014 07:36:20 -0800 [thread overview]
Message-ID: <5492F474.5090606@intel.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1412180850290.2593@gentwo.org>
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.
next prev parent reply other threads:[~2014-12-18 15:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-17 21:47 [PATCH v2] X86-32: Allocate 256 bytes for pgd in PAE paging Fenghua Yu
2014-12-18 0:25 ` Dave Hansen
2014-12-18 14:52 ` Christoph Lameter
2014-12-18 15:36 ` Dave Hansen [this message]
2014-12-18 17:25 ` H. Peter Anvin
2014-12-18 17:51 ` Yu, Fenghua
2014-12-18 18:00 ` H. Peter Anvin
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