Re: [PATCH] General purpose zeroed page slab

From: Martin K. Petersen <>
Date: 2004-10-19 04:06:45
>>>>> "Andi" == Andi Kleen <> writes:

[Sorry about dropping off of the planet for a couple of days.  Had to
deal with some water damage on the house :/]

Andi> The means every user has to memset it to zero before free.  Add
Andi> a comment for that at least.

Andi> Also that's pretty dumb. How about keeping track how much of the
Andi> page got non zeroed (e.g. by using a few free words in struct
Andi> page for a coarse grained dirty bitmap)

Andi> Then you could memset on free only the parts that got actually
Andi> changed, and never waste cache lines for anything else.

Ayup.  I'll ponder this a bit.  For now I think I'm going to leave the
page table cache stuff as is and make the general purpose slab a
separate project.  It'll be easy to switch the page tables over later.

Martin K. Petersen	Wild Open Source, Inc.
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Received on Mon Oct 18 14:07:06 2004

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