From: Peter Zijlstra <peterz@infradead•org>
To: Arnd Bergmann <arnd@arndb•de>
Cc: linux-m32r-ja@ml•linux-m32r.org, kvm@vger•kernel.org,
"Michael S. Tsirkin" <mst@redhat•com>,
Catalin Marinas <catalin.marinas@arm•com>,
Will Deacon <will.deacon@arm•com>,
David Howells <dhowells@redhat•com>,
linux-mm@kvack•org, Paul Mackerras <paulus@samba•org>,
"H. Peter Anvin" <hpa@zytor•com>,
linux-arch@vger•kernel.org, linux-am33-list@redhat•com,
Hirokazu Takata <takata@linux-m32r•org>,
x86@kernel•org, Ingo Molnar <mingo@redhat•com>,
microblaze-uclinux@itee•uq.edu.au,
Chris Metcalf <cmetcalf@tilera•com>,
Thomas Gleixner <tglx@linutronix•de>,
linux-arm-kernel@lists•infradead.org,
Michal Simek <monstr@monstr•eu>,
linux-m32r@ml•linux-m32r.org, linux-kernel@vger•kernel.org,
Koichi Yasutake <yasutake.koichi@jp•panasonic.com>,
linuxppc-dev@lists•ozlabs.org
Subject: Re: [PATCH v2 00/10] uaccess: better might_sleep/might_fault behavior
Date: Wed, 22 May 2013 12:19:16 +0200 [thread overview]
Message-ID: <20130522101916.GM18810@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <201305221125.36284.arnd@arndb.de>
On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote:
> Calling might_fault() for every __get_user/__put_user is rather expensive
> because it turns what should be a single instruction (plus fixup) into an
> external function call.
We could hide it all behind CONFIG_DEBUG_ATOMIC_SLEEP just like
might_sleep() is. I'm not sure there's a point to might_fault() when
might_sleep() is a NOP.
next prev parent reply other threads:[~2013-05-22 10:19 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-16 11:07 [PATCH v2 00/10] uaccess: better might_sleep/might_fault behavior Michael S. Tsirkin
2013-05-16 11:10 ` [PATCH v2 01/10] asm-generic: uaccess s/might_sleep/might_fault/ Michael S. Tsirkin
2013-05-16 11:10 ` [PATCH v2 02/10] arm64: " Michael S. Tsirkin
2013-05-16 13:29 ` Catalin Marinas
2013-05-16 11:10 ` [PATCH v2 03/10] frv: " Michael S. Tsirkin
2013-05-16 11:11 ` [PATCH v2 04/10] m32r: " Michael S. Tsirkin
2013-05-16 11:11 ` [PATCH v2 05/10] microblaze: " Michael S. Tsirkin
2013-05-16 11:12 ` [PATCH v2 06/10] mn10300: " Michael S. Tsirkin
2013-05-16 11:15 ` [PATCH v2 07/10] powerpc: " Michael S. Tsirkin
2013-05-22 13:59 ` Arnd Bergmann
2013-05-22 14:30 ` Michael S. Tsirkin
2013-05-24 13:00 ` Michael S. Tsirkin
2013-05-24 13:11 ` Michael S. Tsirkin
2013-05-24 13:30 ` Arnd Bergmann
2013-05-16 11:15 ` [PATCH v2 08/10] tile: " Michael S. Tsirkin
2013-05-16 13:33 ` Chris Metcalf
2013-05-16 11:15 ` [PATCH v2 09/10] x86: " Michael S. Tsirkin
2013-05-16 11:16 ` [PATCH v2 10/10] kernel: might_fault does not imply might_sleep Michael S. Tsirkin
2013-05-16 18:40 ` Peter Zijlstra
2013-05-19 9:35 ` Michael S. Tsirkin
2013-05-19 12:34 ` Steven Rostedt
2013-05-19 13:34 ` Michael S. Tsirkin
2013-05-19 16:06 ` Steven Rostedt
2013-05-19 16:40 ` Michael S. Tsirkin
2013-05-19 20:23 ` Steven Rostedt
2013-05-19 20:35 ` Michael S. Tsirkin
2013-05-21 11:18 ` Peter Zijlstra
2013-05-21 11:21 ` Peter Zijlstra
2013-05-21 11:57 ` Peter Zijlstra
2013-05-22 9:47 ` Michael S. Tsirkin
2013-05-22 10:16 ` Peter Zijlstra
2013-05-22 20:38 ` Michael S. Tsirkin
2013-05-22 20:36 ` Michael S. Tsirkin
2013-05-22 9:25 ` [PATCH v2 00/10] uaccess: better might_sleep/might_fault behavior Arnd Bergmann
2013-05-22 9:58 ` Michael S. Tsirkin
2013-05-22 10:19 ` Peter Zijlstra [this message]
2013-05-22 11:07 ` Michael S. Tsirkin
2013-05-22 11:27 ` Peter Zijlstra
2013-05-22 13:41 ` Russell King - ARM Linux
2013-05-22 14:04 ` Arnd Bergmann
2013-05-22 14:44 ` Michael S. Tsirkin
2013-05-24 14:18 ` [PATCH v3 07/11] powerpc: uaccess s/might_sleep/might_fault/ Michael S. Tsirkin
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