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

* Ingo Molnar <mingo@elte.hu> 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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