linux-kernel - Re: [PATCH 1/3] perf top: Fix freeze on --call-graph flat/folded

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Date:	Thu, 26 Nov 2015 09:38:53 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Kan Liang <kan.liang@...el.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 1/3] perf top: Fix freeze on --call-graph flat/folded

On Thu, Nov 26, 2015 at 04:08:18PM +0900, Namhyung Kim wrote:
> The callchain rbtree is rebuilt periodically, so it needs to
> reinitialize the root everytime.  Otherwise it can be stuck in the
> rbtree insertion with stale pointers.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/callchain.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
> index fc3b1e0d09ee..564377d2bebf 100644
> --- a/tools/perf/util/callchain.c
> +++ b/tools/perf/util/callchain.c
> @@ -290,6 +290,7 @@ static void
>  sort_chain_flat(struct rb_root *rb_root, struct callchain_root *root,
>  		u64 min_hit, struct callchain_param *param __maybe_unused)
>  {
> +	*rb_root = RB_ROOT;

it seems ok, but I did not find how this could be called twice?

the only sort I can see is done within:
  __hists__insert_output_entry

do we allow resorting of the callchains?

thanks,
jirka

>  	__sort_chain_flat(rb_root, &root->node, min_hit);
>  }
>  
> -- 
> 2.6.2
> 
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