linux-kernel - Re: Implement lbr-as-callgraph v10

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Date:	Sat, 22 Nov 2014 02:25:19 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	"Liang, Kan" <kan.liang@...el.com>
Subject: Re: Implement lbr-as-callgraph v10

>      f1 tcall.c:9
>      main tcall.c:17
>      main tcall.c:17
>      main tcall.c:16
>      main tcall.c:16
>      f1 tcall.c:12
>      f1 tcall.c:12
>      f2 tcall.c:6
>      f2 tcall.c:4
>      f1 tcall.c:11
>      f1 tcall.c:11
>      f2 tcall.c:6
>      f2 tcall.c:4
>      f1 tcall.c:10
>      f1 tcall.c:9
>      main tcall.c:17
> <SNIP>
> 
> 
> Do you see the diff?  The 87.65% and 12.35% doesn't appear on the --tui
> output.

I see the problem. It's some issue in hist_browser__show_callchain.
--stdio doesn't show it because it doesn't seem to use that (?)

With this patch it shows percent for the first entry

@@ -791,7 +791,7 @@ static int hist_browser__show_entry(struct hist_browser *browser,
                };
 
                printed += hist_browser__show_callchain(browser,
-                                       &entry->sorted_chain, 1, row, total,
+                                       &entry->sorted_chain, 2, row, total,
                                        hist_browser__show_callchain_entry, &arg,
                                        hist_browser__check_output_full);

But the numbers are still different from what --stdio outputs,
so there are some deeper issues.

I doubt I caused this, probably some latent bug that just got triggered.

Namhyung?

-Andi
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