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From: "Martin J. Bligh" <mbligh@mbligh.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: "Pekka Enberg" <penberg@cs.helsinki.fi>,
	"Linus Torvalds" <torvalds@osdl.org>,
	"Daniel Hokka Zakrisson" <daniel@hozac.com>,
	linux-kernel@vger.kernel.org,
	"Björn Steinbrink" <B.Steinbrink@gmx.de>,
	greg@kroah.com, matthew@wil.cx, manfred@colorfullife.com,
	akpm@osdl.org
Subject: Re: [PATCH] fs: fcntl_setlease defies lease_init assumptions
Date: Mon, 08 May 2006 20:49:16 -0700	[thread overview]
Message-ID: <4460113C.9090609@mbligh.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0605082031580.23431@schroedinger.engr.sgi.com>

Christoph Lameter wrote:
> On Mon, 8 May 2006, Pekka Enberg wrote:
> 
> 
>>>I think it sounds like it's worth it, but I'm not going to really push it.
>>
>>Sounds good to me. Andrew?
> 
> 
> virt_to_page is not cheap on NUMA.
> 
> On IA64 virt_to_page is:
> 
> #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
> 
> # define pfn_to_page(pfn)       (vmem_map + (pfn))
> 
> vmem_map is not a linear map but a virtual mapping that may require 
> several faults to get the information.

Can't you use sparsemem instead? It solves the same problem without the
magic faulting, doesn't it?

M.

  reply	other threads:[~2006-05-09  3:49 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-05-07 23:21 [PATCH] fs: fcntl_setlease defies lease_init assumptions Daniel Hokka Zakrisson
2006-05-08  3:33 ` Linus Torvalds
2006-05-08  3:34   ` Linus Torvalds
2006-05-08  8:02     ` Daniel Hokka Zakrisson
2006-05-08  7:57   ` Daniel Hokka Zakrisson
2006-05-08  8:31   ` Pekka Enberg
2006-05-08  8:34     ` Pekka Enberg
2006-05-08 15:12       ` Linus Torvalds
2006-05-08 16:06         ` Pekka Enberg
2006-05-08 16:28           ` Linus Torvalds
2006-05-08 19:36             ` Pekka Enberg
2006-05-09  3:38               ` Christoph Lameter
2006-05-09  3:49                 ` Martin J. Bligh [this message]
2006-05-09  5:31                   ` Christoph Lameter
2006-05-09  6:16                     ` Martin J. Bligh
2006-05-09  6:22                 ` Manfred Spraul
2006-05-09  6:35                   ` Keith Owens
2006-05-09  6:37                   ` Nick Piggin
2006-05-09 10:26                   ` Pekka J Enberg
2006-05-09 18:25                     ` Manfred Spraul
2006-05-09 18:56                       ` Linus Torvalds
2006-05-09 19:05                       ` Pekka Enberg
2006-05-09 19:15                         ` Pekka Enberg
2006-05-09 14:40                 ` Linus Torvalds
2006-05-09 23:59                   ` Christoph Lameter
2006-05-08 16:36         ` Dave Jones

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