On Tue, Sep 25, 2012 at 02:18:20AM +0530, Srivatsa S. Bhat wrote: > > From: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxxxxxxx> > --- Looks good to me. I'll include it in the writeback tree. Thanks, Fengguang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>