Re: call_rcu from trace_preempt

Daniel Wagner
2015-06-16T17:13:17Z

On 06/16/2015 06:07 PM, Paul E. McKenney wrote:
> On Tue, Jun 16, 2015 at 11:43:42AM -0400, Steven Rostedt wrote:
>> On Tue, 16 Jun 2015 07:16:26 -0700
>> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
>>
>>>> Just for the record: Using a thread for freeing the memory is curing the
>>>> problem without the need to modify rcu_is_watching.
>>>
>>> I must confess to liking this approach better than guaranteeing full-up
>>> reentrancy in call_rcu() and kfree_rcu(). ;-)
>>
>> Then reentrancy must be really bad if you prefer a spinning thread that
>> polls constantly just to free an item ;-)
>
> I was (perhaps naively) assuming that they would use a less aggressive
> approach at some point. ;-)

Yes, this was just playing around :)