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[Xen-devel] Re: [PATCH] backport rcu_needs_cpu and call it from stop_hz_timer

On 12 Jun 2006, at 12:57, Harry Butterworth wrote:

I have now tested this against xen-testing 9735. Without the patch, and
with a domU kernel configured with CONFIG_DEBUG_SOFTLOCKUP disabled
(this debug code masks the problem), and smp and cpu hotplug enabled, a
script which does lots of cpu hotplug/removal will hang (cpu
hotplug/removal stresses the RCU synchronize_sched function).  With the
patch, the script doing cpu hotplug/removal runs for as long as I have
let it so far (thousands of hotplugs).

Okay, the patch looks good to me. I'll apply to our trees. Thanks.

 -- Keir

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