Messages in this thread | | | Date | Tue, 26 Feb 2013 14:16:38 +0100 | Subject | Re: [PATCH v4] sched: fix init NOHZ_IDLE flag | From | Frederic Weisbecker <> |
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2013/2/22 Vincent Guittot <vincent.guittot@linaro.org>: > I wanted to avoid having to use the sd pointer for testing NOHZ_IDLE > flag because it occurs each time we go into idle but it seems to be > not easily feasible. > Another solution could be to add a synchronization step between > rcu_assign_pointer(dom 1, NULL) and create new domain to ensure that > all pending access to old sd values, has finished but this will imply > a potential delay in the rebuild of sched_domain and i'm not sure > that it's acceptable
The other issue is that we'll need to abuse the fact that struct sched_domain is per cpu in order to store a per cpu state there. That's a bit ugly but at least safer.
Also, are struct sched_group and struct sched_group_power shared among several CPUs or are they per CPUs allocated as well? I guess they aren't otherwise nr_cpus_busy would be pointless.
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