Re: [PATCH 0/5] make slab gfp fair

[Andrew Morton]

On Mon, 14 May 2007 11:12:24 -0500
Matt Mackall <mpm@xxxxxxxxxxx> wrote:

> If I understand this correctly:
> 
> privileged thread                      unprivileged greedy process
> kmem_cache_alloc(...)
>    adds new slab page from lowmem pool
> do_io()
>                                        kmem_cache_alloc(...)
>                                        kmem_cache_alloc(...)
>                                        kmem_cache_alloc(...)
>                                        kmem_cache_alloc(...)
>                                        kmem_cache_alloc(...)
>                                        ...
>                                           eats it all
> kmem_cache_alloc(...) -> ENOMEM
>    who ate my donuts?!

Yes, that's my understanding also.

I can see why it's a problem in theory, but I don't think Peter has yet
revealed to us why it's a problem in practice.  I got all excited when
Christoph asked "I am not sure what the point of all of this is.", but
Peter cunningly avoided answering that ;)

What observed problem is being fixed here?
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