linux-kernel - Re: [PATCH v3 3/4] x86, mpx: add prctl commands PR_MPX_INIT, PR_MPX

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Date:	Sun, 26 Jan 2014 09:22:01 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Qiaowei Ren <qiaowei.ren@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH v3 3/4] x86, mpx: add prctl commands PR_MPX_INIT,
 PR_MPX_RELEASE


* Qiaowei Ren <qiaowei.ren@...el.com> wrote:

> This patch adds the PR_MPX_INIT and PR_MPX_RELEASE prctl()
> commands on the x86 platform. These commands can be used to
> init and release MPX related resource.
> 
> A MMU notifier will be registered during PR_MPX_INIT
> command execution. So the bound tables can be automatically
> deallocated when one memory area is unmapped.
> 
> Signed-off-by: Qiaowei Ren <qiaowei.ren@...el.com>
> ---
>  arch/x86/Kconfig                 |    4 ++
>  arch/x86/include/asm/mpx.h       |    9 ++++
>  arch/x86/include/asm/processor.h |   16 +++++++
>  arch/x86/kernel/mpx.c            |   84 ++++++++++++++++++++++++++++++++++++++
>  include/uapi/linux/prctl.h       |    6 +++
>  kernel/sys.c                     |   12 +++++
>  6 files changed, 131 insertions(+), 0 deletions(-)

Hm. What is the expected typical frequency of these syscalls for a 
larger application like a web browser? Only once per startup 
typically, or will they be called more frequently?

Thanks,

	Ingo
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