From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Vince Weaver <vincent.weaver@maine.edu>, linux-kernel@vger.kernel.org,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Stephane Eranian <eranian@gmail.com>
Subject: Re: perf: aux area related crash and warnings
In-Reply-To: <20150618103249.GK19282@twins.programming.kicks-ass.net>
References: <alpine.DEB.2.20.1506112305510.2757@vincent-weaver-1.umelst.maine.edu> <alpine.DEB.2.20.1506121431190.4444@vincent-weaver-1.umelst.maine.edu> <20150615122054.GY3644@twins.programming.kicks-ass.net> <87egld2l2o.fsf@ashishki-desk.ger.corp.intel.com> <87381rg9zx.fsf@ashishki-desk.ger.corp.intel.com> <20150618103249.GK19282@twins.programming.kicks-ass.net>
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Date: Thu, 18 Jun 2015 16:11:03 +0300
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Peter Zijlstra <peterz@infradead.org> writes:

> On Tue, Jun 16, 2015 at 02:37:06PM +0300, Alexander Shishkin wrote:
>> Ok, here's what I propose for this one.
>
> As discussed yesterday, I think we want to change to how we do reference
> counting for the regular buffers, but that will require quite a bit of
> work.
>
> For the interim we can avoid the issue by something like the below;
> compile tested only.

Looks good and works fine on my tests. Only I'd maybe add a small
comment on why reusing rcu_head.next doesn't set off call_rcu()
debugging. Other than that, fwiw,

Reviewed-and-tested-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>

Thanks,
--
Alex
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