Srivatsa Vaddagiri wrote:
>
> Oleg, with all these inputs, I consider the patch I had sent to be correct.
Yes, I think so. My suspects were due to my misunderstanding.
I was wrong when I said that we can ignore rmb() part of mb()
in case when start_hz_timer() runs after rcu_start_batch().
rcp->cur++;
// ->cur will be visible to other cpus
// _before_ we will *READ* nohz_cpu_mask.
// we don't have any 'timing' problems.
// In other words: if another cpu does not
// see the new value - we did not read this
// mask yet.
smp_mb();
Thanks for your patience.
> P.S :- Thanks to everybody who reponded clarifying this subject.
Yes! it was really helpful, thanks to all. I think it would be great
to have Paul's very clear (and short!) explanation somewhere in
Documentation/.
Oleg.
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