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

Christoph Lameter
2007-05-14T16:29:24Z

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.
>