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

[Christoph Lameter <clameter@sgi.com>]

On Mon, 14 May 2007, Matt Mackall wrote:

> privileged thread                      unprivileged greedy process
> kmem_cache_alloc(...)
>    adds new slab page from lowmem pool

Yes but it returns an object for the privileged thread. Is that not 
enough?


> 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?!
> 
> But I think this solution is somehow overkill. If we only care about
> this issue in the OOM avoidance case, then our rank reduces to a
> boolean.
> 
> -- 
> Mathematics is the supreme nostalgia of our time.
> 
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