linux-kernel - [tip:perf/core] perf hists browser: Fix event group display

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Message-ID: <tip-d9ea48bc4e7cc297ca1073fa3f90ed80d964b7b4@git.kernel.org>
Date:   Tue, 20 Sep 2016 14:37:15 -0700
From:   tip-bot for Namhyung Kim <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     jolsa@...nel.org, namhyung@...nel.org, acme@...hat.com,
        tglx@...utronix.de, hpa@...or.com, mingo@...nel.org,
        andi@...stfloor.org, linux-kernel@...r.kernel.org,
        a.p.zijlstra@...llo.nl, milian.wolff@...b.com
Subject: [tip:perf/core] perf hists browser: Fix event group display

Commit-ID:  d9ea48bc4e7cc297ca1073fa3f90ed80d964b7b4
Gitweb:     http://git.kernel.org/tip/d9ea48bc4e7cc297ca1073fa3f90ed80d964b7b4
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Mon, 12 Sep 2016 15:19:52 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 12 Sep 2016 11:10:26 -0300

perf hists browser: Fix event group display

Milian reported that the event group on TUI shows duplicated overhead.
This was due to a bug on calculating hpp->buf position.  The
hpp_advance() was called from __hpp__slsmg_color_printf() on TUI but
it's already called from the hpp__call_print_fn macro in __hpp__fmt().
The end result is that the print function returns number of bytes it
printed but the buffer advanced twice of the length.

This is generally not a problem since it doesn't need to access the
buffer again.  But with event group, overhead needs to be printed
multiple times and hist_entry__snprintf_alignment() tries to fill the
space with buffer after it printed.  So it (brokenly) showed the last
overhead again.

The bug was there from the beginning, but I think it's only revealed
when the alignment function was added.

Reported-by: Milian Wolff <milian.wolff@...b.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Fixes: 89fee7094323 ("perf hists: Do column alignment on the format iterator")
Link: http://lkml.kernel.org/r/20160912061958.16656-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/ui/browsers/hists.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index f0611c9..35e44b1 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1097,7 +1097,6 @@ static int __hpp__slsmg_color_printf(struct perf_hpp *hpp, const char *fmt, ...)
 	ret = scnprintf(hpp->buf, hpp->size, fmt, len, percent);
 	ui_browser__printf(arg->b, "%s", hpp->buf);

-	advance_hpp(hpp, ret);
 	return ret;
 }