Srivatsa S. Bhat 2f60d628ff CPU hotplug, writeback: Don't call writeback_set_ratelimit() too often during hotplug ...

The CPU hotplug callback related to writeback calls writeback_set_ratelimit()
during every state change in the hotplug sequence. This is unnecessary
since num_online_cpus() changes only once during the entire hotplug operation.

So invoke the function only once per hotplug, thereby avoiding the
unnecessary repetition of those costly calculations.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>

2012-09-28 20:27:49 +08:00

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