Messages in this thread | | | Date | Fri, 3 May 2013 20:09:26 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 1/2] sched: Add cond_resched_rcu_lock() helper |
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> This happens in only two cases: > > 1. CONFIG_PREEMPT_RCU=n kernels. But in this case, rcu_read_unlock() > and rcu_read_lock() are free, at least for CONFIG_PROVE_LOCKING=n > kernels. And if you have CONFIG_PROVE_LOCKING=y, any contribution > from rcu_read_unlock() and rcu_read_lock() will be in the noise.
Oh argh.. I completely overlooked that rcu_read_{,un}lock() are NOPs for PREEMPT=n kernels.
/me crawls back under his stone..
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