netdev - Re: [PATCH v2 1/2] sched: Add cond_resched_rcu

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Message-ID: <20130502072623.GE7521@dyad.programming.kicks-ass.net>
Date:	Thu, 2 May 2013 09:26:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Julian Anastasov <ja@....bg>
Cc:	Simon Horman <horms@...ge.net.au>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Dipankar Sarma <dipankar@...ibm.com>
Subject: Re: [PATCH v2 1/2] sched: Add cond_resched_rcu_lock() helper

On Wed, May 01, 2013 at 09:22:08PM +0300, Julian Anastasov wrote:
> > +extern int __cond_resched_rcu(void);
> > +
> > +#define cond_resched_rcu() ({			\
> > +	__might_sleep(__FILE__, __LINE__, 0);	\
> 
> 	I see your goal. But digging into __might_sleep()
> I see that rcu_sleep_check() will scream for the non-preempt
> case because we are under rcu_read_lock.


#ifdef CONFIG_PREEMPT_RCU
#define PREEMPT_RCU_OFFSET 0
#else
#define PREEMPT_RCU_OFFSET 1
#endif

#define cond_resched_rcu() ({	\
	__might_sleep(__FILE__, __LINE__, PREEMPT_RCU_OFFSET);	\
	__cond_resched_rcu();	\
})

Should work I think..
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