Patch "perf hists browser: Fix event group display" has been added to the 4.4-stable tree

Patch "perf hists browser: Fix event group display" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    perf hists browser: Fix event group display

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     perf-hists-browser-fix-event-group-display.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d9ea48bc4e7cc297ca1073fa3f90ed80d964b7b4 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung@kernel.org>
Date: Mon, 12 Sep 2016 15:19:52 +0900
Subject: perf hists browser: Fix event group display

From: Namhyung Kim <namhyung@kernel.org>

commit d9ea48bc4e7cc297ca1073fa3f90ed80d964b7b4 upstream.

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@kdab.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.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@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 tools/perf/ui/browsers/hists.c |    1 -
 1 file changed, 1 deletion(-)

--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -684,7 +684,6 @@ static int __hpp__slsmg_color_printf(str
 	ret = scnprintf(hpp->buf, hpp->size, fmt, len, percent);
 	ui_browser__printf(arg->b, "%s", hpp->buf);
 
-	advance_hpp(hpp, ret);
 	return ret;
 }
 


Patches currently in stable-queue which might be from namhyung@kernel.org are

queue-4.4/perf-hists-browser-fix-event-group-display.patch
queue-4.4/perf-symbols-check-symbol_conf.allow_aliases-for-kallsyms-loading-too.patch
queue-4.4/perf-stat-fix-interval-output-values.patch
queue-4.4/perf-symbols-fixup-symbol-sizes-before-picking-best-ones.patch