Re: [PATCH] hotplug: Optimize {get,put}_online_cpus()

[Peter Zijlstra]

On Wed, Oct 02, 2013 at 02:13:56PM +0200, Oleg Nesterov wrote:
> In short: unless a gp elapses between _exit() and _enter(), the next
> _enter() does nothing and avoids synchronize_sched().

That does however make the entire scheme entirely writer biased;
increasing the need for the waitcount thing I have. Otherwise we'll
starve pending readers.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/