On Thu, 2012-03-15 at 22:48 +0800, Cong Wang wrote: > In the seq file operations, it still hold module_mutex for just reading > the module list, switch to rcu_read_lock_sched() too. > Why is it needed ? 1) insmod/rmmod/lsmod is hardly in fast path. 2) after a mutex_lock(), a task is still preemptible after rcu_read_lock_sched(), preemption is disabled with NR_CPUS=4096, getting module refcounts is _very_ slow RCU doesnt fit every workload. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
