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perf report: Don't show blank lines if entry has no callchain 

When all callchains of a hist entry is percent-limited, do not add a
blank line at the end.  It makes the entry look like it doesn't have
callchains.

Reported-and-Tested-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20160128122454.GA27446@danjae.kornet
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2016-01-28 21:24:54 +09:00 committed by Arnaldo Carvalho de Melo
parent 59c624e239
commit 3848c23b19
1 changed files with 4 additions and 1 deletions
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5
tools/perf/ui/stdio/hist.c
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@ -233,7 +233,10 @@ static size_t callchain__fprintf_graph(FILE *fp, struct rb_root *root,
ret += __callchain__fprintf_graph(fp, root, total_samples,
1, 1, left_margin);
ret += fprintf(fp, "\n");
if (ret) {
/* do not add a blank line if it printed nothing */
ret += fprintf(fp, "\n");
}
return ret;
}