Messages in this thread | | | From | Daniel Phillips <> | Subject | Re: large page patch (fwd) (fwd) | Date | Fri, 9 Aug 2002 18:15:51 +0200 |
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On Friday 09 August 2002 17:56, Linus Torvalds wrote: > On Fri, 9 Aug 2002, Daniel Phillips wrote: > > This reference describes roughly what I had in mind for active > > defragmentation, which depends on reverse mapping. > > Note that even active defrag won't be able to handle the case where you > want have lots of big pages, consituting a large percentage of available > memory.
Perhaps I'm missing something, but I don't see why.
> Not unless you think I am crazy enough to do garbage collection on kernel > data structures (repeat after me: "garbage collection is stupid, slow, bad > for caches, and only for people who cannot count").
Slab allocations would not have GFP_DEFRAG (I mistakenly wrote GFP_LARGE earlier) and so would be allocated outside ZONE_LARGE.
> Also, I think the jury (ie Andrew) is still out on whether rmap is worth > it.
Tell me about it. Well, I feel strongly enough about it to spend the next week coding yet another pte chain optimization.
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