Re: [PATCH v3 3/4] x86, mpx: add prctl commands PR_MPX_INIT, PR_MPX_RELEASE

[Ren Qiaowei]

On 01/26/2014 04:22 PM, Ingo Molnar wrote:
> * Qiaowei Ren <qiaowei.ren@xxxxxxxxx> 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@xxxxxxxxx>
> > ---
> >   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?

It will be only once per startup.

Thanks,
Qiaowei
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