Re: [PATCH 2.6.16-mm1 1/2] sched_domain: handle kmalloc failure

[Srivatsa Vaddagiri <vatsa@in.ibm.com>]

On Sat, Mar 25, 2006 at 06:06:05PM -0800, Andrew Morton wrote:
> This is rather ugly, sorry.

That was about my reaction too when I was going thr'
build_sched_domains()!

> So if the kmalloc failed we'll try to limp along without load balancing?

Not exactly. We will still load balance at lower domains (between
threads of a CPU & between CPUs of a node) that dont require any memory
allocation.

> I think it would be better to free any thus-far allocated memory and to
> fail the whole thing.

This would result in absolutely no load balancing (even for domain
levels which didnt need any memory allocation - like at threads-of-a-cpu
level). Is that acceptable?

> Returning void from build_sched_domains was wrong.

If we decide to return an error, then it has to be percolated all the
way down (for ex: update_cpu_domains should now have to return an error
too if partition_sched_domains returns an error)?

> build_sched_domains() should be static and __cpuinit, btw.

Ok ..Will take care of that in the next version of the patch.

And thanks for the response to the patch!

-- 
Regards,
vatsa