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Date: Tue, 29 Jan 2002 11:55:48 -0800
From: William Lee Irwin III <wli@holomorphy.com>
To: Momchil Velikov <velco@fadata.bg>
Cc: Daniel Phillips <phillips@bonn-fries.net>,
        Oliver Xymoron <oxymoron@waste.org>,
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Subject: Re: Note describing poor dcache utilization under high memory pressure
Message-ID: <20020129115548.J899@holomorphy.com>
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	Momchil Velikov <velco@fadata.bg>,
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In-Reply-To: <87ofjd794t.fsf@fadata.bg>; from velco@fadata.bg on Tue, Jan 29, 2002 at 12:18:42PM +0200
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"William" == William Lee Irwin <wli@holomorphy.com> writes:
William> Please correct my attempt at clarifying this:
William> The COW markings are done at the next higher level of hierarchy above
William> the pte's themselves, and so experience the radix tree branch factor
William> reduction in the amount of work done at fork-time in comparison to a
William> full pagetable copy on fork.

On Tue, Jan 29, 2002 at 12:18:42PM +0200, Momchil Velikov wrote:
> COW at pgd/pmd level is ia32-ism, unlike COW at pte level.

Pain! Well, at least the pte markings dodge the page_add_rmap() bullet.

On Tue, Jan 29, 2002 at 12:18:42PM +0200, Momchil Velikov wrote:
> PS. Well, the whole pgd/pmd/ptb stuff is ia32-ism, but that's another
> story.

Perhaps something can be done about that.


Cheers,
Bill
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