From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-ia64@vger.kernel.org,
Linux Kernel list <linux-kernel@vger.kernel.org>,
Anton Blanchard <anton@samba.org>
Subject: Re: page fault fastpath: Increasing SMP scalability by introducing pte locks?
Date: Mon, 16 Aug 2004 08:38:06 +1000 [thread overview]
Message-ID: <1092609485.9538.27.camel@gaston> (raw)
In-Reply-To: <Pine.LNX.4.58.0408150630560.324@schroedinger.engr.sgi.com>
On Sun, 2004-08-15 at 23:50, Christoph Lameter wrote:
> Well this is more an idea than a real patch yet. The page_table_lock
> becomes a bottleneck if more than 4 CPUs are rapidly allocating and using
> memory. "pft" is a program that measures the performance of page faults on
> SMP system. It allocates memory simultaneously in multiple threads thereby
> causing lots of page faults for anonymous pages.
Just a note: on ppc64, we already have a PTE lock bit, we use it to
guard against concurrent hash table insertion, it could be extended
to the whole page fault path provided we can guarantee we will never
fault in the hash table on that PTE while it is held. This shouldn't
be a problem as long as only user pages are locked that way (which
should be the case with do_page_fault) provided update_mmu_cache()
is updated to not take this lock, but assume it already held.
Ben.
next prev parent reply other threads:[~2004-08-15 22:45 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
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 ` Benjamin Herrenschmidt [this message]
2004-08-16 17:28 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? 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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