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From: Phillip Susi <psusi@cfl.rr.com>
To: Dave McCracken <dmccr@us.ibm.com>
Cc: Hugh Dickins <hugh@veritas.com>, Andrew Morton <akpm@osdl.org>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	Linux Memory Management <linux-mm@kvack.org>
Subject: Re: [PATCH/RFC] Shared page tables
Date: Fri, 13 Jan 2006 10:18:31 -0500	[thread overview]
Message-ID: <43C7C4C7.8050409@cfl.rr.com> (raw)
In-Reply-To: <A6D73CCDC544257F3D97F143@[10.1.1.4]>

Shouldn't those kind of applications already be using threads to share 
page tables rather than forking hundreds of processes that all mmap() 
the same file?


Dave McCracken wrote:
> Here's a new version of my shared page tables patch.
>
> The primary purpose of sharing page tables is improved performance for
> large applications that share big memory areas between multiple processes.
> It eliminates the redundant page tables and significantly reduces the
> number of minor page faults.  Tests show significant performance
> improvement for large database applications, including those using large
> pages.  There is no measurable performance degradation for small processes.
>
> This version of the patch uses Hugh's new locking mechanism, extending it
> up the page table tree as far as necessary for proper concurrency control.
>
> The patch also includes the proper locking for following the vma chains.
>
> Hugh, I believe I have all the lock points nailed down.  I'd appreciate
> your input on any I might have missed.
>
> The architectures supported are i386 and x86_64.  I'm working on 64 bit
> ppc, but there are still some issues around proper segment handling that
> need more testing.  This will be available in a separate patch once it's
> solid.
>
> Dave McCracken
>   


  parent reply	other threads:[~2006-01-13 15:18 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-05 16:19 [PATCH/RFC] Shared page tables Dave McCracken
2006-01-07 12:25 ` Heiko Carstens
2006-01-07 18:09   ` Dave McCracken
2006-01-08 12:09     ` Heiko Carstens
2006-01-08 14:04       ` Dave McCracken
2006-01-13  5:15 ` Brian Twichell
2006-01-13 22:34   ` Ray Bryant
2006-01-17  4:50     ` Brian Twichell
2006-01-25  4:14   ` Brian Twichell
2006-01-13 15:18 ` Phillip Susi [this message]
2006-01-14 20:45   ` Brian Twichell
2006-01-17 23:53 ` Robin Holt
2006-01-18  0:17   ` Dave Hansen
2006-01-18  6:11     ` Dave McCracken
2006-01-18  1:27   ` Chen, Kenneth W
2006-01-18  3:32     ` Robin Holt
2006-01-23 23:58   ` Ray Bryant
2006-01-24  0:16     ` Ray Bryant
2006-01-24  0:39       ` Andi Kleen
2006-01-24  0:51         ` Dave McCracken
2006-01-24  1:11           ` Andi Kleen
2006-01-24  1:26             ` Dave McCracken
2006-01-24  0:53         ` Ray Bryant
2006-01-24  1:00           ` Dave McCracken
2006-01-24  1:10           ` Andi Kleen
2006-01-24  1:23             ` Benjamin LaHaise
2006-01-24  1:38               ` Andi Kleen
2006-01-24  7:08                 ` Arjan van de Ven
2006-01-24  7:06             ` Arjan van de Ven
2006-01-24  7:18               ` Andi Kleen
2006-01-27 18:16                 ` Martin Bligh
2006-02-01  9:49                 ` Nick Piggin
2006-01-24 14:48               ` Dave McCracken
2006-01-24 14:56                 ` Arjan van de Ven
2006-01-24  0:19     ` Dave McCracken
2006-01-24  0:46       ` Ray Bryant
2006-01-24 23:43       ` Ray Bryant
2006-01-24 23:50         ` Dave McCracken
2006-01-25  0:21           ` Ray Bryant
2006-01-25 22:48           ` Ray Bryant
2006-01-25 22:52             ` Dave McCracken
2006-01-26  0:16               ` Ray Bryant
2006-01-26  0:58               ` Ray Bryant
2006-01-26  4:06                 ` Robin Holt
2006-01-20 21:24 ` Hugh Dickins
2006-01-20 21:54   ` Chen, Kenneth W
2006-01-23 17:39   ` Dave McCracken
2006-01-23 20:19     ` Benjamin LaHaise
2006-01-24 17:50     ` Hugh Dickins
2006-01-24 18:07       ` Dave McCracken
2006-01-24 18:20         ` Hugh Dickins
2006-01-27 22:50   ` Brian Twichell
2006-01-30 18:46     ` Ray Bryant
2006-01-31 18:47       ` Brian Twichell
2006-01-31 19:18         ` Dave McCracken

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