From: "H. Peter Anvin" <hpa@zytor.com>
To: Tejun Heo <tj@kernel.org>
Cc: Yanmin Zhang <yanmin_zhang@linux.intel.com>,
ShuoX Liu <shuox.liu@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Christoph Lameter <cl@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH] percpu, x86: don't use PMD_SIZE as embedded atom_size on 32bit
Date: Fri, 27 Apr 2012 10:17:17 -0700 [thread overview]
Message-ID: <4F9AD49D.6080406@zytor.com> (raw)
In-Reply-To: <20120427165356.GA26595@google.com>
On 04/27/2012 09:53 AM, Tejun Heo wrote:
>
> + /*
> + * If PSE is available, use PMD_SIZE for atom_size so that
> + * embedded percpu areas are aligned to PMD. This, in the
> + * future, can also allow using PMD mappings in vmalloc
> + * area. Use PAGE_SIZE on 32bit as vmalloc space is highly
> + * contended and large vmalloc area alloc can easily fail.
> + */
> + atom_size = PAGE_SIZE;
> +#ifdef CONFIG_X86_64
> + if (cpu_has_pse)
> + atom_size = PMD_SIZE;
> +#endif
Just make it PAGE_SIZE on i386 and PMD_SIZE on x86-64; keep the behavior
consistent. !cpu_has_pse on x86-64 is an abnormal situation (I think it
applies to Xen, pretty much.)
Other than that,
Acked-by: H. Peter Anvin <hpa@zytor.com>
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2012-04-27 17:17 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-25 8:49 [PATCH] mm: percpu: Add PCPU_FC_FIXED to pcpu_fc for setting fixed pcpu_atom_size ShuoX Liu
2012-04-25 22:24 ` Tejun Heo
2012-04-26 2:01 ` Yanmin Zhang
2012-04-26 22:49 ` Tejun Heo
2012-04-27 1:09 ` Yanmin Zhang
2012-04-27 8:56 ` Yanmin Zhang
2012-04-27 16:53 ` [PATCH] percpu, x86: don't use PMD_SIZE as embedded atom_size on 32bit Tejun Heo
2012-04-27 17:17 ` H. Peter Anvin [this message]
2012-04-27 17:27 ` Tejun Heo
2012-04-27 17:21 ` Christoph Lameter
2012-04-27 17:27 ` Tejun Heo
2012-04-27 17:39 ` [PATCH v2] " Tejun Heo
2012-04-27 17:51 ` H. Peter Anvin
2012-04-27 17:53 ` Tejun Heo
2012-04-28 2:18 ` [PATCH] " ShuoX Liu
2012-04-27 16:34 ` [PATCH] mm: percpu: Add PCPU_FC_FIXED to pcpu_fc for setting fixed pcpu_atom_size Tejun Heo
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