From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754772AbcITUGX (ORCPT ); Tue, 20 Sep 2016 16:06:23 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:57173 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932718AbcITUEv (ORCPT ); Tue, 20 Sep 2016 16:04:51 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Namhyung Kim , Andi Kleen , Jiri Olsa , Peter Zijlstra , Arnaldo Carvalho de Melo Subject: [PATCH 02/22] perf hists browser: Fix event group display Date: Tue, 20 Sep 2016 17:03:22 -0300 Message-Id: <1474401822-18902-3-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1474401822-18902-1-git-send-email-acme@kernel.org> References: <1474401822-18902-1-git-send-email-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Namhyung Kim 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 Signed-off-by: Namhyung Kim Cc: Andi Kleen Cc: Jiri Olsa Cc: Peter Zijlstra 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 --- 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 f0611c937d4b..35e44b1879e3 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; } -- 2.7.4