From: Andy Lutomirski <luto@amacapital.net>
To: Dave Hansen <dave.hansen@intel.com>
Cc: "Ren, Qiaowei" <qiaowei.ren@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, X86 ML <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface
Date: Thu, 26 Jun 2014 15:19:26 -0700 [thread overview]
Message-ID: <CALCETrVTTh9yuXH0hfcOpytyBd25K6thPfqqUBQtnOqx90ZRqw@mail.gmail.com> (raw)
In-Reply-To: <53AB42E1.4090102@intel.com>
On Wed, Jun 25, 2014 at 2:45 PM, Dave Hansen <dave.hansen@intel.com> wrote:
> 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.
Hmm. So does VM_MPX, though. If this stuff were done entirely in
userspace, then memfd_create would be exactly the right solution, I
think.
Would it work to just scan the bound directory to figure out how many
bound tables exist?
--Andy
WARNING: multiple messages have this Message-ID (diff)
From: Andy Lutomirski <luto@amacapital.net>
To: Dave Hansen <dave.hansen@intel.com>
Cc: "Ren, Qiaowei" <qiaowei.ren@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, X86 ML <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface
Date: Thu, 26 Jun 2014 15:19:26 -0700 [thread overview]
Message-ID: <CALCETrVTTh9yuXH0hfcOpytyBd25K6thPfqqUBQtnOqx90ZRqw@mail.gmail.com> (raw)
In-Reply-To: <53AB42E1.4090102@intel.com>
On Wed, Jun 25, 2014 at 2:45 PM, Dave Hansen <dave.hansen@intel.com> wrote:
> 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.
Hmm. So does VM_MPX, though. If this stuff were done entirely in
userspace, then memfd_create would be exactly the right solution, I
think.
Would it work to just scan the bound directory to figure out how many
bound tables exist?
--Andy
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next prev parent reply other threads:[~2014-06-26 22:19 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-18 9:44 [PATCH v6 00/10] Intel MPX support Qiaowei Ren
2014-06-18 9:44 ` [PATCH v6 01/10] x86, mpx: introduce VM_MPX to indicate that a VMA is MPX specific Qiaowei Ren
2014-06-18 9:44 ` [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface Qiaowei Ren
2014-06-23 19:49 ` Andy Lutomirski
2014-06-23 19:49 ` Andy Lutomirski
2014-06-23 20:03 ` Dave Hansen
2014-06-23 20:03 ` Dave Hansen
2014-06-23 20:06 ` Andy Lutomirski
2014-06-23 20:06 ` Andy Lutomirski
2014-06-23 20:28 ` Dave Hansen
2014-06-23 20:28 ` Dave Hansen
2014-06-23 21:04 ` Andy Lutomirski
2014-06-23 21:04 ` Andy Lutomirski
2014-06-24 5:53 ` Ren, Qiaowei
2014-06-24 5:53 ` Ren, Qiaowei
2014-06-24 23:55 ` Andy Lutomirski
2014-06-24 23:55 ` Andy Lutomirski
2014-06-25 1:40 ` Ren, Qiaowei
2014-06-25 1:40 ` Ren, Qiaowei
2014-06-25 21:04 ` Andy Lutomirski
2014-06-25 21:04 ` Andy Lutomirski
2014-06-25 21:05 ` Andy Lutomirski
2014-06-25 21:05 ` Andy Lutomirski
2014-06-25 21:45 ` Dave Hansen
2014-06-25 21:45 ` Dave Hansen
2014-06-26 22:19 ` Andy Lutomirski [this message]
2014-06-26 22:19 ` Andy Lutomirski
2014-06-26 22:58 ` Dave Hansen
2014-06-26 22:58 ` Dave Hansen
2014-06-26 23:15 ` Andy Lutomirski
2014-06-26 23:15 ` Andy Lutomirski
2014-06-27 0:19 ` Dave Hansen
2014-06-27 0:19 ` Dave Hansen
2014-06-27 0:26 ` Andy Lutomirski
2014-06-27 0:26 ` Andy Lutomirski
2014-06-27 17:34 ` Dave Hansen
2014-06-27 17:34 ` Dave Hansen
2014-06-27 17:42 ` Dave Hansen
2014-06-27 17:42 ` Dave Hansen
2014-06-27 18:57 ` Andy Lutomirski
2014-06-27 18:57 ` Andy Lutomirski
2014-06-25 21:43 ` Dave Hansen
2014-06-25 21:43 ` Dave Hansen
2014-06-24 2:53 ` Ren, Qiaowei
2014-06-24 2:53 ` Ren, Qiaowei
2014-06-18 9:44 ` [PATCH v6 03/10] x86, mpx: add macro cpu_has_mpx Qiaowei Ren
2014-06-18 9:57 ` Borislav Petkov
2014-06-18 14:35 ` Dave Hansen
2014-06-18 14:44 ` Borislav Petkov
2014-06-18 14:58 ` Dave Hansen
2014-06-18 15:25 ` Borislav Petkov
2014-06-18 16:17 ` Dave Hansen
2014-06-18 15:00 ` H. Peter Anvin
2014-06-18 15:27 ` Borislav Petkov
2014-06-18 14:59 ` H. Peter Anvin
2014-06-18 16:25 ` Dave Hansen
2014-06-18 17:21 ` Borislav Petkov
2014-06-19 18:02 ` H. Peter Anvin
2014-06-19 18:50 ` Dave Hansen
2014-06-20 3:28 ` H. Peter Anvin
2014-06-18 9:44 ` [PATCH v6 04/10] x86, mpx: hook #BR exception handler to allocate bound tables Qiaowei Ren
2014-06-23 19:54 ` Andy Lutomirski
2014-06-24 1:53 ` Ren, Qiaowei
2014-07-11 16:23 ` Dave Hansen
2014-06-18 9:44 ` [PATCH v6 05/10] x86, mpx: extend siginfo structure to include bound violation information Qiaowei Ren
2014-06-18 9:44 ` [PATCH v6 06/10] mips: sync struct siginfo with general version Qiaowei Ren
2014-06-18 9:44 ` [PATCH v6 07/10] x86, mpx: decode MPX instruction to get bound violation information Qiaowei Ren
2014-06-18 10:07 ` Borislav Petkov
2014-06-19 1:13 ` Ren, Qiaowei
2014-06-19 6:28 ` Borislav Petkov
2014-06-19 6:53 ` Ren, Qiaowei
2014-06-19 17:04 ` Dave Hansen
2014-06-19 17:32 ` H. Peter Anvin
2014-06-20 3:21 ` Ren, Qiaowei
2014-06-18 9:44 ` [PATCH v6 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER, PR_MPX_UNREGISTER Qiaowei Ren
2014-06-19 20:58 ` Dave Hansen
2014-06-23 20:00 ` Andy Lutomirski
2014-06-23 20:09 ` Dave Hansen
2014-06-23 22:00 ` Andy Lutomirski
2014-06-23 23:42 ` Dave Hansen
2014-06-24 0:01 ` Andy Lutomirski
2014-06-24 0:10 ` Dave Hansen
2014-06-18 9:44 ` [PATCH v6 09/10] x86, mpx: cleanup unused bound tables Qiaowei Ren
2014-06-23 19:57 ` Andy Lutomirski
2014-06-18 9:44 ` [PATCH v6 10/10] x86, mpx: add documentation on Intel MPX Qiaowei Ren
2014-06-18 14:41 ` [PATCH v6 00/10] Intel MPX support Dave Hansen
2014-06-18 14:41 ` Dave Hansen
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