Re: [PATCH 08/35] autonuma: introduce kthread_bind_node()

Peter Zijlstra
2012-05-29T17:48:32Z

On Tue, 2012-05-29 at 19:44 +0200, Andrea Arcangeli wrote:
>
> But it'd be totally bad not to do the hard bindings to the cpu_s_ of
> the node, and not using PF_THREAD_BOUND would just allow userland to
> shoot itself in the foot. I mean if PF_THREAD_BOUND wouldn't exist
> already I wouldn't add it, but considering somebody bothered to
> implement it for the sake to make userland root user "safer", it'd be
> really silly not to take advantage of that for knuma_migrated too
> (even if it binds to more than 1 CPU).

No, I'm absolutely ok with the user shooting himself in the foot. The
thing exists because you can crash stuff if you get it wrong with
per-cpu.

Crashing is not good, worse performance is his own damn fault.