Re: [PATCH] General purpose zeroed page slab

Martin K. Petersen
2004-10-18T18:06:45Z

>>>>> "Andi" = Andi Kleen <ak@suse.de> 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.
mkp@wildopensource.com http://www.wildopensource.com/