From: Avi Kivity <avi@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Christoph Lameter <cl@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Andi Kleen <andi@firstfloor.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
minchan.kim@gmail.com
Subject: Re: [mm][RFC][PATCH 0/11] mm accessor updates.
Date: Fri, 18 Dec 2009 19:00:26 +0200 [thread overview]
Message-ID: <4B2BB52A.7050103@redhat.com> (raw)
In-Reply-To: <20091218051754.GC417@elte.hu>
On 12/18/2009 07:17 AM, Ingo Molnar wrote:
>
>> It is not about naming. The accessors hide the locking mechanism for
>> mmap_sem. Then you can change the locking in a central place.
>>
>> The locking may even become configurable later. Maybe an embedded solution
>> will want the existing scheme but dual quad socket may want a distributed
>> reference counter to avoid bouncing cachelines on faults.
>>
> Hiding the locking is pretty much the worst design decision one can make.
>
>
It does allow incremental updates. For example if we go with range
locks, the accessor turns into a range lock of the entire address space;
users can be converted one by one to use their true ranges in order of
importance.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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next prev parent reply other threads:[~2009-12-18 17:01 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-16 3:00 [mm][RFC][PATCH 0/11] mm accessor updates KAMEZAWA Hiroyuki
2009-12-16 3:01 ` [mm][RFC][PATCH 1/11] mm accessor for replacing mmap_sem KAMEZAWA Hiroyuki
2009-12-16 3:02 ` [mm][RFC][PATCH 2/11] mm accessor for kernel core KAMEZAWA Hiroyuki
2009-12-16 3:03 ` [mm][RFC][PATCH 3/11] mm accessor for fs KAMEZAWA Hiroyuki
2009-12-16 3:04 ` [mm][RFC][PATCH 4/11] mm accessor for kvm KAMEZAWA Hiroyuki
2009-12-16 3:05 ` [mm][RFC][PATCH 5/11] mm accessor for tomoyo KAMEZAWA Hiroyuki
2009-12-16 3:06 ` [mm][RFC][PATCH 6/11] mm accessor for driver/gpu KAMEZAWA Hiroyuki
2009-12-16 3:07 ` [mm][RFC][PATCH 7/11] mm accessor for inifiniband KAMEZAWA Hiroyuki
2009-12-16 3:08 ` [mm][RFC][PATCH 8/11] mm accessor for video KAMEZAWA Hiroyuki
2009-12-16 3:09 ` [mm][RFC][PATCH 9/11] mm accessor for sgi gru KAMEZAWA Hiroyuki
2009-12-16 3:10 ` [mm][RFC][PATCH 10/11] mm accessor for misc drivers KAMEZAWA Hiroyuki
2009-12-16 3:11 ` [mm][RFC][PATCH 11/11] mm accessor for x86 KAMEZAWA Hiroyuki
2009-12-16 10:11 ` [mm][RFC][PATCH 0/11] mm accessor updates Andi Kleen
2009-12-16 10:13 ` KAMEZAWA Hiroyuki
2009-12-16 10:28 ` Andi Kleen
2009-12-16 10:31 ` KAMEZAWA Hiroyuki
2009-12-16 10:49 ` Andi Kleen
2009-12-16 11:12 ` KAMEZAWA Hiroyuki
2009-12-16 11:31 ` Andi Kleen
2009-12-16 16:27 ` Christoph Lameter
2009-12-16 23:01 ` Peter Zijlstra
2009-12-17 4:11 ` KOSAKI Motohiro
2009-12-17 8:41 ` Andi Kleen
2009-12-16 22:57 ` Peter Zijlstra
2009-12-17 8:40 ` Andi Kleen
2009-12-17 8:45 ` Peter Zijlstra
2009-12-17 8:54 ` Andi Kleen
2009-12-17 14:45 ` Paul E. McKenney
2009-12-17 15:02 ` Peter Zijlstra
2009-12-17 17:53 ` Andi Kleen
2009-12-17 19:08 ` Paul E. McKenney
2009-12-17 19:55 ` Andi Kleen
2009-12-17 19:56 ` Christoph Lameter
2009-12-17 20:14 ` Peter Zijlstra
2009-12-17 20:42 ` Christoph Lameter
2009-12-18 5:17 ` Ingo Molnar
2009-12-18 17:00 ` Avi Kivity [this message]
2009-12-18 17:12 ` Ingo Molnar
2009-12-18 18:12 ` Christoph Lameter
2009-12-18 18:43 ` Andi Kleen
2009-12-18 18:45 ` Ingo Molnar
2009-12-18 23:18 ` KAMEZAWA Hiroyuki
2009-12-17 19:33 ` Christoph Lameter
2009-12-17 20:07 ` Peter Zijlstra
2009-12-17 20:13 ` Christoph Lameter
2009-12-17 20:19 ` Peter Zijlstra
2009-12-16 10:31 ` Minchan Kim
2009-12-16 10:33 ` KAMEZAWA Hiroyuki
2009-12-18 0:38 ` [RFC 0/4] speculative page fault (Was " KAMEZAWA Hiroyuki
2009-12-18 0:41 ` [RFC 1/4] uninline mm accessor KAMEZAWA Hiroyuki
2009-12-18 0:43 ` [RFC 2/4] add mm event counter KAMEZAWA Hiroyuki
2009-12-19 3:23 ` Minchan Kim
2009-12-19 6:37 ` KAMEZAWA Hiroyuki
2009-12-18 0:45 ` [RFC 3/4] lockless vma caching KAMEZAWA Hiroyuki
2009-12-19 3:43 ` Minchan Kim
2009-12-19 6:44 ` KAMEZAWA Hiroyuki
2009-12-18 0:46 ` [RFC 4/4] speculative pag fault KAMEZAWA Hiroyuki
2009-12-18 5:54 ` Minchan Kim
2009-12-18 6:06 ` KAMEZAWA Hiroyuki
2009-12-18 6:33 ` Minchan Kim
2009-12-19 3:55 ` Minchan Kim
2009-12-19 6:49 ` KAMEZAWA Hiroyuki
2009-12-16 16:24 ` [mm][RFC][PATCH 0/11] mm accessor updates Christoph Lameter
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