On 16/05/16 18:02, Peter Zijlstra wrote: > On Mon, May 16, 2016 at 04:31:08PM +0100, Dietmar Eggemann wrote: >> On 09/05/16 11:48, Peter Zijlstra wrote: >> >> Couldn't you just always access sd->shared via >> sd = rcu_dereference(per_cpu(sd_llc, cpu)) for >> updating nr_busy_cpus? > > Sure; but why would I want to add that extra dereference? Note that in > the next patch I add more users of sd_llc_shared. >
I see ... I thought because you do this already in set_cpu_sd_state_[busy|idle]. But there you need the sd reference to set sd->nohz_idle already.
