Re: [GIT PULL rcu/next] rcu commits for 2.6.40

[Ingo Molnar]

* Ingo Molnar <mingo@xxxxxxx> wrote:

> I started bisecting this, and the two relevant endpoints:
> 
>   bad: 11c476f: net,rcu: convert call_rcu(prl_entry_destroy_rcu) to kfree
>  good: 0ee5623f: Linux 2.6.39-rc6
> 
> very clearly indicate that this is an RCU regression.

This might be the same one Yinghai found:

 e59fb3120bec: rcu: Decrease memory-barrier usage based on semi-formal proof

So with the config i sent it's definitely reproducible.

At first sight couldnt this be related not to barriers, but to not setting 
need_resched() like we did before?

Thanks,

	Ingo
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