From: Ingo Molnar <mingo@elte.hu>
To: Andrew Morton <akpm@digeo.com>
Cc: Linus Torvalds <torvalds@transmeta.com>,
"Martin J. Bligh" <mbligh@aracnet.com>,
Dave McCracken <dmccr@us.ibm.com>,
Daniel Phillips <phillips@arcor.de>,
linux-mm@kvack.org
Subject: Re: shared pagetable benchmarking
Date: Sat, 28 Dec 2002 08:39:12 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.4.44.0212280837340.2443-100000@localhost.localdomain> (raw)
In-Reply-To: <3E0D4B83.FEE220B8@digeo.com>
On Fri, 27 Dec 2002, Andrew Morton wrote:
> Yup. Ingo said at the time:
>
> It would be faster to iterate the pagecache mapping's radix tree
> and the pagetables at once, but it's also *much* more complex. I have
> tried to implement it and had to unroll the change - mixing radix tree
> walking and pagetable walking and getting all the VM details right is
> really complex - especially considering all the re-lookup race checks
> that have to occur upon IO.
>
> But find_get_pages() is well-suited to this, and was not in place when
> he did this work.
i agree that find_get_pages() would simplify this work. I did not consider
group-lookup - i tried to implement an algorithm that had a single-page
scope, to keep the amount of locked pages to the minimum.
Ingo
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next prev parent reply other threads:[~2002-12-28 7:39 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-20 11:11 Andrew Morton
2002-12-20 11:13 ` William Lee Irwin III
2002-12-20 16:30 ` Dave McCracken
2002-12-20 19:59 ` Andrew Morton
2002-12-23 16:15 ` Dave McCracken
2002-12-23 23:54 ` Andrew Morton
2002-12-27 9:39 ` Daniel Phillips
2002-12-27 9:58 ` Andrew Morton
2002-12-27 15:59 ` Daniel Phillips
2002-12-27 20:02 ` Linus Torvalds
2002-12-27 20:16 ` Dave McCracken
2002-12-27 20:18 ` Linus Torvalds
2002-12-27 20:45 ` Dave McCracken
2002-12-27 20:50 ` Linus Torvalds
2002-12-27 23:56 ` Daniel Phillips
2002-12-28 0:45 ` Martin J. Bligh
2002-12-28 2:34 ` Andrew Morton
2002-12-28 3:10 ` Linus Torvalds
2002-12-28 6:58 ` Andrew Morton
2002-12-28 7:39 ` Ingo Molnar [this message]
2002-12-28 7:47 ` Linus Torvalds
2002-12-28 23:28 ` Andrew Morton
2002-12-28 3:19 ` Martin J. Bligh
2002-12-23 18:19 ` Dave McCracken
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