From: William Lee Irwin III <wli@holomorphy.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Ray Bryant <raybry@sgi.com>, "David S. Miller" <davem@redhat.com>,
linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: page fault fastpath: Increasing SMP scalability by introducing pte locks?
Date: Mon, 16 Aug 2004 09:18:45 -0700 [thread overview]
Message-ID: <20040816161845.GA11200@holomorphy.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0408160817210.8293@schroedinger.engr.sgi.com>
On Mon, 16 Aug 2004, Ray Bryant wrote:
>> Something else to worry about here is mm->rss. Previously, this was updated
>> only with the page_table_lock held, so concurrent increments were not a
>> problem. rss may need to converted be an atomic_t if you use pte_locks.
>> It may be that an approximate value for rss is good enough, but I'm not sure
>> how to bound the error that could be introduced by a couple of hundred
>> processers handling page faults in parallel and updating rss without locking
>> it or making it an atomic_t.
On Mon, Aug 16, 2004 at 08:18:11AM -0700, Christoph Lameter wrote:
> Correct. There are a number of issues that may have to be addressed but
> first we need to agree on a general idea how to proceed.
I'd favor a per-cpu counter so the cacheline doesn't bounce.
-- wli
next prev parent reply other threads:[~2004-08-16 16:19 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-15 13:50 page fault fastpath: Increasing SMP scalability by introducing pte locks? Christoph Lameter
2004-08-15 20:09 ` David S. Miller
2004-08-15 22:58 ` Christoph Lameter
2004-08-15 23:58 ` David S. Miller
2004-08-16 0:11 ` Christoph Lameter
2004-08-16 1:56 ` David S. Miller
2004-08-16 3:29 ` Christoph Lameter
2004-08-16 7:00 ` Ray Bryant
2004-08-16 15:18 ` Christoph Lameter
2004-08-16 16:18 ` William Lee Irwin III [this message]
2004-08-16 14:39 ` William Lee Irwin III
2004-08-17 15:28 ` page fault fastpath patch v2: fix race conditions, stats for 8,32 and 512 cpu SMP Christoph Lameter
2004-08-17 15:37 ` Christoph Hellwig
2004-08-17 15:51 ` William Lee Irwin III
2004-08-18 17:55 ` Hugh Dickins
2004-08-18 20:20 ` William Lee Irwin III
2004-08-19 1:19 ` Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA3129027B679F@mtv-atc-605e--n.corp.sgi.com>
2004-08-24 4:43 ` page fault scalability patch v3: use cmpxchg, make rss atomic Christoph Lameter
2004-08-24 5:49 ` Christoph Lameter
2004-08-24 12:34 ` Matthew Wilcox
2004-08-24 14:47 ` Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA3129027B67A9@mtv-atc-605e--n.corp.sgi.com>
2004-08-26 15:20 ` page fault scalability patch v4: reduce page_table_lock use, atomic pmd,pgd handlin Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA3129027B67B4@mtv-atc-605e--n.corp.sgi.com>
2004-08-27 23:20 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-08-27 23:36 ` Andi Kleen
2004-08-27 23:43 ` David S. Miller
2004-08-28 0:19 ` Christoph Lameter
2004-08-28 0:23 ` David S. Miller
2004-08-28 0:36 ` Andrew Morton
2004-08-28 0:40 ` David S. Miller
2004-08-28 1:05 ` Andi Kleen
2004-08-28 1:11 ` David S. Miller
2004-08-28 1:17 ` Andi Kleen
2004-08-28 1:02 ` Andi Kleen
2004-08-28 1:39 ` Andrew Morton
2004-08-28 2:08 ` Paul Mackerras
2004-08-28 3:32 ` Christoph Lameter
2004-08-28 3:42 ` Andrew Morton
2004-08-28 4:24 ` Christoph Lameter
2004-08-28 5:39 ` Andrew Morton
2004-08-28 5:58 ` Christoph Lameter
2004-08-28 6:03 ` William Lee Irwin III
2004-08-28 6:06 ` Andrew Morton
2004-08-30 17:02 ` Herbert Poetzl
2004-08-30 17:05 ` Andi Kleen
2004-08-28 13:19 ` Andi Kleen
2004-08-28 15:48 ` Matt Mackall
2004-09-01 4:13 ` Benjamin Herrenschmidt
2004-09-02 21:26 ` Andi Kleen
2004-09-02 21:55 ` David S. Miller
2004-09-01 18:03 ` Matthew Wilcox
2004-09-01 18:19 ` Andrew Morton
2004-09-01 19:06 ` William Lee Irwin III
2004-08-28 21:41 ` Daniel Phillips
2004-09-01 4:24 ` Benjamin Herrenschmidt
2004-09-01 5:22 ` David S. Miller
2004-09-01 16:43 ` Christoph Lameter
2004-09-01 23:09 ` Benjamin Herrenschmidt
[not found] ` <Pine.LNX.4.58.0409012140440.23186@schroedinger.engr.sgi.com>
[not found] ` <20040901215741.3538bbf4.davem@davemloft.net>
2004-09-02 5:18 ` William Lee Irwin III
2004-09-09 15:38 ` page fault scalability patch: V7 (+fallback for atomic page table ops) Christoph Lameter
2004-09-02 16:24 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-09-02 20:10 ` David S. Miller
2004-09-02 21:02 ` Christoph Lameter
2004-09-02 21:07 ` David S. Miller
2004-09-18 23:23 ` page fault scalability patch V8: [0/7] Description Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA312902CD3243@mtv-atc-605e--n.corp.sgi.com>
2004-09-18 23:24 ` page fault scalability patch V8: [1/7] make mm->rss atomic Christoph Lameter
2004-09-18 23:26 ` page fault scalability patch V8: [2/7] avoid page_table_lock in handle_mm_fault Christoph Lameter
2004-09-19 9:04 ` Christoph Hellwig
2004-09-18 23:27 ` page fault scalability patch V8: [3/7] atomic pte operations for ia64 Christoph Lameter
2004-09-18 23:28 ` page fault scalability patch V8: [4/7] universally available cmpxchg on i386 Christoph Lameter
[not found] ` <200409191430.37444.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-19 12:11 ` Andi Kleen
2004-09-20 15:45 ` Christoph Lameter
[not found] ` <200409202043.00580.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-20 20:49 ` Christoph Lameter
2004-09-20 20:57 ` Andi Kleen
[not found] ` <200409211841.25507.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-21 15:45 ` Andi Kleen
[not found] ` <200409212306.38800.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-21 20:14 ` Andi Kleen
2004-09-23 7:17 ` Andy Lutomirski
2004-09-23 9:03 ` Andi Kleen
2004-09-27 19:06 ` page fault scalability patch V9: [0/7] overview Christoph Lameter
2004-10-15 19:02 ` page fault scalability patch V10: " Christoph Lameter
2004-10-15 19:03 ` page fault scalability patch V10: [1/7] make rss atomic Christoph Lameter
2004-10-15 19:04 ` page fault scalability patch V10: [2/7] defer/omit taking page_table_lock Christoph Lameter
2004-10-15 20:00 ` Marcelo Tosatti
2004-10-18 15:59 ` Christoph Lameter
2004-10-19 5:25 ` [revised] " Christoph Lameter
2004-10-15 19:05 ` page fault scalability patch V10: [3/7] IA64 atomic pte operations Christoph Lameter
2004-10-15 19:06 ` page fault scalability patch V10: [4/7] cmpxchg for 386 and 486 Christoph Lameter
2004-10-15 19:06 ` page fault scalability patch V10: [5/7] i386 atomic pte operations Christoph Lameter
2004-10-15 19:07 ` page fault scalability patch V10: [6/7] x86_64 " Christoph Lameter
2004-10-15 19:08 ` page fault scalability patch V10: [7/7] s/390 " Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA312902CD3282@mtv-atc-605e--n.corp.sgi.com>
2004-09-27 19:07 ` page fault scalability patch V9: [1/7] make mm->rss atomic Christoph Lameter
2004-09-27 19:08 ` page fault scalability patch V9: [2/7] defer/remove page_table_lock Christoph Lameter
2004-09-27 19:10 ` page fault scalability patch V9: [3/7] atomic pte operatios for ia64 Christoph Lameter
2004-09-27 19:10 ` page fault scalability patch V9: [4/7] generally available cmpxchg on i386 Christoph Lameter
2004-09-27 19:11 ` page fault scalability patch V9: [5/7] atomic pte operations for i386 Christoph Lameter
2004-09-27 19:12 ` page fault scalability patch V9: [6/7] atomic pte operations for x86_64 Christoph Lameter
2004-09-27 19:13 ` page fault scalability patch V9: [7/7] atomic pte operatiosn for s390 Christoph Lameter
2004-09-18 23:29 ` page fault scalability patch V8: [5/7] atomic pte operations for i386 Christoph Lameter
2004-09-18 23:30 ` page fault scalability patch V8: [6/7] atomic pte operations for x86_64 Christoph Lameter
2004-09-18 23:31 ` page fault scalability patch V8: [7/7] atomic pte operations for s390 Christoph Lameter
[not found] ` <200409191435.09445.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-20 15:44 ` Christoph Lameter
2004-08-15 22:38 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Benjamin Herrenschmidt
2004-08-16 17:28 ` Christoph Lameter
2004-08-17 8:01 ` Benjamin Herrenschmidt
[not found] <2ttIr-2e4-17@gated-at.bofh.it>
[not found] ` <2tzE4-6sw-25@gated-at.bofh.it>
[not found] ` <2tCiw-8pK-1@gated-at.bofh.it>
2004-08-15 23:53 ` Andi Kleen
2004-08-15 23:55 ` Christoph Lameter
2004-08-16 0:12 ` Andi Kleen
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