linux-kernel - Re: [PATCH v5 2/3] x86, mpx: hook #BR exception handler to allocate bound tables

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Message-ID: <530B86A5.6060100@zytor.com>
Date:	Mon, 24 Feb 2014 09:51:33 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Hansen <dave.hansen@...el.com>,
	Qiaowei Ren <qiaowei.ren@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
CC:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] x86, mpx: hook #BR exception handler to allocate
 bound tables

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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