linux-kernel - Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface

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Date:	Wed, 25 Jun 2014 14:45:05 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Andy Lutomirski <luto@...capital.net>,
	"Ren, Qiaowei" <qiaowei.ren@...el.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface

On 06/25/2014 02:05 PM, Andy Lutomirski wrote:
> Hmm.  the memfd_create thing may be able to do this for you.  If you
> created a per-mm memfd and mapped it, it all just might work.

memfd_create() seems to bring a fair amount of baggage along (the fd
part :) if all we want is a marker.  Really, all we need is _a_ bit, and
some way to plumb to userspace the RSS values of VMAs with that bit set.

Creating and mmap()'ing a fd seems a rather roundabout way to get there.
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