linux-kernel - Re: call_rcu from trace

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Message-ID: <20150616114342.340b8c06@gandalf.local.home>
Date:	Tue, 16 Jun 2015 11:43:42 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Daniel Wagner <wagi@...om.org>,
	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 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 ;-)

-- Steve
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