linux-kernel - Re: call_rcu from trace

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Message-ID: <5580591E.50008@monom.org>
Date:	Tue, 16 Jun 2015 19:13:02 +0200
From:	Daniel Wagner <wagi@...om.org>
To:	paulmck@...ux.vnet.ibm.com, Steven Rostedt <rostedt@...dmis.org>
CC:	Alexei Starovoitov <ast@...mgrid.com>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: call_rcu from trace_preempt

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@...ux.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 :)

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