Re: [PATCH] Move slab objects to the end of the real allocation

[Manfred Spraul]

Arnd Bergmann wrote:

> On Monday 22 September 2003 18:31, Manfred Spraul wrote:
>  
>
> > Right now there are too many patches in Andrew's tree, I'll wait until
> > everything settled down a bit, then I'll resent the cache line size as a
> > one-line patch. Do you want to implement CONFIG_DEBUG_PAGEALLOC
> > immediately? If yes, then I can send you the oneliner immediately.
> > Nothing except CONFIG_DEBUG_PAGEALLOC is affected by the bug.
> >    
>
> Thanks for the explanation. I didn't realize that the code only applies
> to i386. I'm not trying to implement CONFIG_DEBUG_PAGEALLOC currently,
> but I'll put it on my list of things to do. Do I need to do anything
> beyond adding a working kernel_map_pages() and raising the 128 byte limit
> in kmem_cache_create to max(128,L1_CACHE_BYTES)?
>  
I'm not aware of any other restrictions, but I think s390 would be the 
first arch beyond i386 that supports DEBUG_PAGEALLOC, so beware. One 
important point is that kernel_map_pages() can be called from irq 
context - I'm not sure if all archs can support that.

--
   Manfred

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