linux-kernel - Re: [PATCH 4/7] perf hist: Initialize hierachy tree explicitly

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Date:   Mon, 12 Sep 2016 11:22:28 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 4/7] perf hist: Initialize hierachy tree explicitly

Em Mon, Sep 12, 2016 at 03:19:55PM +0900, Namhyung Kim escreveu:
> The hroot_in and hroot_out are root of hiearchy tree of hist entry.  But
> as hist entry is initialized by copying existing template entry, it

Which makes default_ops->new() pointing to a zalloc based constructor
totally useless, right? I.e. we malloc() + bzero() to then imediatelly
memcpy from the template :-)

> sometimes has non-empty tree and copied it incorrectly.  This is a
> problem especially when event group is used since it creates dummy
> entries from already-processed entries in other event members.

I guess this needs a "Fixes:" probably for the changeset introducing
those members :-\

- Arnaldo
 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/hist.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 702ba3a8ead6..37a08f20730a 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -417,6 +417,8 @@ static int hist_entry__init(struct hist_entry *he,
>  	}
>  	INIT_LIST_HEAD(&he->pairs.node);
>  	thread__get(he->thread);
> +	he->hroot_in  = RB_ROOT;
> +	he->hroot_out = RB_ROOT;
>  
>  	if (!symbol_conf.report_hierarchy)
>  		he->leaf = true;
> -- 
> 2.9.3