Message-ID: <530B86A5.6060100@zytor.com>
Date: Mon, 24 Feb 2014 09:51:33 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Dave Hansen <dave.hansen@intel.com>, Qiaowei Ren <qiaowei.ren@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>
CC: x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 2/3] x86, mpx: hook #BR exception handler to allocate
 bound tables
References: <1393162071-23995-1-git-send-email-qiaowei.ren@intel.com> <1393162071-23995-3-git-send-email-qiaowei.ren@intel.com> <530B8112.5080400@intel.com>
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On 02/24/2014 09:27 AM, Dave Hansen wrote:
> 
> Can you talk a little bit about what the design is here?  Why does the
> kernel have to do the allocation of the virtual address space?  Does it
> really need to MAP_POPULATE?  bt_size looks like 4MB, and that's an
> awful lot of memory to eat up at once.  Shouldn't we just let the kernel
> demand-fault this like everything else?
> 

MAP_POPULATE definitely seems like the wrong thing.

	-hpa

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