From: Dave Hansen <dave.hansen@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Qiaowei Ren <qiaowei.ren@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-ia64@vger.kernel.org, linux-mips@linux-mips.org
Subject: Re: [PATCH v9 11/12] x86, mpx: cleanup unused bound tables
Date: Thu, 06 Nov 2014 21:50:03 +0000 [thread overview]
Message-ID: <545BED0B.8000001@intel.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1410241451280.5308@nanos>
Instead of all of these games with dropping and reacquiring mmap_sem and
adding other locks, or deferring the work, why don't we just do a
get_user_pages()? Something along the lines of:
while (1) {
ret = cmpxchg(addr)
if (!ret)
break;
if (ret = -EFAULT)
get_user_pages(addr);
}
Does anybody see a problem with that?
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Qiaowei Ren <qiaowei.ren@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-ia64@vger.kernel.org, linux-mips@linux-mips.org
Subject: Re: [PATCH v9 11/12] x86, mpx: cleanup unused bound tables
Date: Thu, 06 Nov 2014 13:50:03 -0800 [thread overview]
Message-ID: <545BED0B.8000001@intel.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1410241451280.5308@nanos>
Instead of all of these games with dropping and reacquiring mmap_sem and
adding other locks, or deferring the work, why don't we just do a
get_user_pages()? Something along the lines of:
while (1) {
ret = cmpxchg(addr)
if (!ret)
break;
if (ret == -EFAULT)
get_user_pages(addr);
}
Does anybody see a problem with that?
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Qiaowei Ren <qiaowei.ren@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-ia64@vger.kernel.org, linux-mips@linux-mips.org
Subject: Re: [PATCH v9 11/12] x86, mpx: cleanup unused bound tables
Date: Thu, 06 Nov 2014 13:50:03 -0800 [thread overview]
Message-ID: <545BED0B.8000001@intel.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1410241451280.5308@nanos>
Instead of all of these games with dropping and reacquiring mmap_sem and
adding other locks, or deferring the work, why don't we just do a
get_user_pages()? Something along the lines of:
while (1) {
ret = cmpxchg(addr)
if (!ret)
break;
if (ret == -EFAULT)
get_user_pages(addr);
}
Does anybody see a problem with that?
--
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next prev parent reply other threads:[~2014-11-06 21:50 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-12 4:41 [PATCH v9 00/12] Intel MPX support Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` [PATCH v9 01/12] x86, mpx: introduce VM_MPX to indicate that a VMA is MPX specific Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` [PATCH v9 02/12] x86, mpx: rename cfg_reg_u and status_reg Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` [PATCH v9 03/12] x86, mpx: add MPX specific mmap interface Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` [PATCH v9 04/12] x86, mpx: add MPX to disaabled features Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` [PATCH v9 05/12] x86, mpx: on-demand kernel allocation of bounds tables Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-24 12:08 ` Thomas Gleixner
2014-10-24 12:08 ` Thomas Gleixner
2014-10-24 12:08 ` Thomas Gleixner
2014-10-27 3:20 ` Ren Qiaowei
2014-10-27 3:20 ` Ren Qiaowei
2014-10-27 3:20 ` Ren Qiaowei
2014-10-28 17:43 ` Dave Hansen
2014-10-28 17:43 ` Dave Hansen
2014-10-28 17:43 ` Dave Hansen
2014-10-28 17:57 ` Thomas Gleixner
2014-10-28 17:57 ` Thomas Gleixner
2014-10-28 17:57 ` Thomas Gleixner
2014-10-12 4:41 ` [PATCH v9 06/12] mpx: extend siginfo structure to include bound violation information Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` [PATCH v9 07/12] mips: sync struct siginfo with general version Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` [PATCH v9 08/12] ia64: " Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` [PATCH v9 09/12] x86, mpx: decode MPX instruction to get bound violation information Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-24 12:36 ` Thomas Gleixner
2014-10-24 12:36 ` Thomas Gleixner
2014-10-24 12:36 ` Thomas Gleixner
2014-10-27 1:43 ` Ren, Qiaowei
2014-10-27 1:43 ` Ren, Qiaowei
2014-10-27 20:36 ` Thomas Gleixner
2014-10-27 20:36 ` Thomas Gleixner
2014-10-27 20:36 ` Thomas Gleixner
2014-10-28 5:58 ` Ren Qiaowei
2014-10-28 5:58 ` Ren Qiaowei
2014-10-28 5:58 ` Ren Qiaowei
2014-10-31 20:16 ` Dave Hansen
2014-10-31 20:16 ` Dave Hansen
2014-10-31 20:33 ` Thomas Gleixner
2014-10-31 20:33 ` Thomas Gleixner
2014-10-31 20:33 ` Thomas Gleixner
2014-10-30 22:38 ` Dave Hansen
2014-10-30 22:38 ` Dave Hansen
2014-10-30 22:38 ` Dave Hansen
2014-10-31 2:12 ` Ren Qiaowei
2014-10-31 2:12 ` Ren Qiaowei
2014-10-31 2:12 ` Ren Qiaowei
2014-10-31 9:09 ` Thomas Gleixner
2014-10-31 9:09 ` Thomas Gleixner
2014-10-31 9:09 ` Thomas Gleixner
2014-10-12 4:41 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMENT Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-24 12:49 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMEN Thomas Gleixner
2014-10-24 12:49 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMENT Thomas Gleixner
2014-10-24 12:49 ` Thomas Gleixner
2014-10-24 15:10 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMEN Thomas Gleixner
2014-10-24 15:10 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMENT Thomas Gleixner
2014-10-24 15:10 ` Thomas Gleixner
2014-10-27 2:17 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMEN Ren, Qiaowei
2014-10-27 2:17 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMENT Ren, Qiaowei
2014-10-27 2:17 ` Ren, Qiaowei
2014-10-27 20:38 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMEN Thomas Gleixner
2014-10-27 20:38 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMENT Thomas Gleixner
2014-10-27 20:38 ` Thomas Gleixner
2014-10-28 5:57 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMEN Ren Qiaowei
2014-10-28 5:57 ` [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE_MANAGEMENT Ren Qiaowei
2014-10-28 5:57 ` Ren Qiaowei
2014-10-12 4:41 ` [PATCH v9 11/12] x86, mpx: cleanup unused bound tables Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-24 14:40 ` Thomas Gleixner
2014-10-24 14:40 ` Thomas Gleixner
2014-10-24 14:40 ` Thomas Gleixner
2014-10-27 3:13 ` Ren Qiaowei
2014-10-27 3:13 ` Ren Qiaowei
2014-10-27 3:13 ` Ren Qiaowei
2014-10-27 20:49 ` Thomas Gleixner
2014-10-27 20:49 ` Thomas Gleixner
2014-10-27 20:49 ` Thomas Gleixner
2014-10-28 5:56 ` Ren Qiaowei
2014-10-28 5:56 ` Ren Qiaowei
2014-10-28 5:56 ` Ren Qiaowei
2014-10-28 10:42 ` Thomas Gleixner
2014-10-28 10:42 ` Thomas Gleixner
2014-10-28 10:42 ` Thomas Gleixner
2014-11-03 20:53 ` Dave Hansen
2014-11-03 20:53 ` Dave Hansen
2014-11-03 20:53 ` Dave Hansen
2014-11-03 20:53 ` Dave Hansen
2014-11-03 21:29 ` Thomas Gleixner
2014-11-03 21:29 ` Thomas Gleixner
2014-11-03 21:29 ` Thomas Gleixner
2014-11-03 21:29 ` Thomas Gleixner
2014-11-04 16:00 ` Dave Hansen
2014-11-04 16:00 ` Dave Hansen
2014-11-04 16:00 ` Dave Hansen
2014-11-04 17:02 ` Thomas Gleixner
2014-11-04 17:02 ` Thomas Gleixner
2014-11-04 17:02 ` Thomas Gleixner
2014-11-06 21:50 ` Dave Hansen [this message]
2014-11-06 21:50 ` Dave Hansen
2014-11-06 21:50 ` Dave Hansen
2014-11-11 18:27 ` Thomas Gleixner
2014-11-11 18:27 ` Thomas Gleixner
2014-11-11 18:27 ` Thomas Gleixner
2014-11-11 20:44 ` Dave Hansen
2014-11-11 20:44 ` Dave Hansen
2014-11-11 20:44 ` Dave Hansen
2014-11-11 21:36 ` Thomas Gleixner
2014-11-11 21:36 ` Thomas Gleixner
2014-11-11 21:36 ` Thomas Gleixner
2014-10-12 4:41 ` [PATCH v9 12/12] x86, mpx: add documentation on Intel MPX Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
2014-10-12 4:41 ` Qiaowei Ren
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