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On 11/17, Paul E. McKenney wrote: > > Oleg, any thoughts about Jens's optimization? He would code something > like: > > if (srcu_readers_active(&my_srcu)) > synchronize_srcu(); > else > smp_mb(); Well, this is clearly racy, no? I am not sure, but may be we can do smp_mb(); if (srcu_readers_active(&my_srcu)) synchronize_srcu(); in this case we also need to add 'smp_mb()' into srcu_read_lock() after 'atomic_inc(&sp->hardluckref)'. > However, he is doing ordered I/O requests rather than protecting data > structures. Probably this makes a difference, but I don't understand this. Oleg. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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