Subject: Re: rps perfomance WAS(Re: rps: question

From: Andi Kleen <[email-masked]>
Date: Fri, 16 Apr 2010 09:15:22 +0200

> > Come on Changli.
> >
> > How do you wake up a thread on a remote cpu ?
> >
> 
> resched IPI, apparently. But it is async absolutely. and its IRQ
> handler is lighter.

It shouldn't be a lot lighter than the new fancy "queued smp_call_function"
that's in the tree for a few releases. So it would surprise me if it made
much difference. In the old days when there was only a single lock for
s_c_f() perhaps...

-Andi

-- 
[email-masked] -- Speaking for myself only.