Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751802AbdHFVZG (ORCPT ); Sun, 6 Aug 2017 17:25:06 -0400 Received: from mail.kdab.com ([176.9.126.58]:46040 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751589AbdHFVZB (ORCPT ); Sun, 6 Aug 2017 17:25:01 -0400 From: Milian Wolff To: acme@kernel.org, Jin Yao , Linux-kernel@vger.kernel.org, Namhyung Kim Cc: linux-perf-users@vger.kernel.org, Milian Wolff , Arnaldo Carvalho de Melo , David Ahern , Peter Zijlstra Subject: [PATCH v2 04/14] perf report: fall-back to function name comparison for -g srcline Date: Sun, 6 Aug 2017 23:24:36 +0200 Message-Id: <20170806212446.24925-5-milian.wolff@kdab.com> In-Reply-To: <20170806212446.24925-1-milian.wolff@kdab.com> References: <20170806212446.24925-1-milian.wolff@kdab.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3868 Lines: 114 When a callchain entry has no srcline available, we ended up comparing the instruction pointer. I consider this to be not too useful. Rather, I think we should group the entries by function name, which this patch adds. For people who want to split the data on the IP boundary, using `-g address` is the correct choice. Before: ~~~~~ 100.00% 38.86% [.] main | |--61.14%--main inlining.cpp:14 | std::norm complex:664 | std::_Norm_helper::_S_do_it complex:654 | std::abs complex:597 | std::__complex_abs complex:589 | | | |--56.03%--hypot | | | | | |--8.45%--__hypot_finite | | | | | |--7.62%--__hypot_finite | | | | | |--2.29%--__hypot_finite | | | | | |--2.24%--__hypot_finite | | | | | |--2.06%--__hypot_finite | | | | | |--1.81%--__hypot_finite ... ~~~~~ After: ~~~~~ 100.00% 38.86% [.] main | |--61.14%--main inlining.cpp:14 | std::norm complex:664 | std::_Norm_helper::_S_do_it complex:654 | std::abs complex:597 | std::__complex_abs complex:589 | | | |--60.29%--hypot | | | | | --56.03%--__hypot_finite | | | --0.85%--cabs ~~~~~ Cc: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Yao Jin Signed-off-by: Milian Wolff --- tools/perf/util/callchain.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c index 9854adb06ac1..6afa8ccd75b5 100644 --- a/tools/perf/util/callchain.c +++ b/tools/perf/util/callchain.c @@ -638,11 +638,9 @@ enum match_result { MATCH_GT, }; -static enum match_result match_chain_srcline(struct callchain_cursor_node *node, - struct callchain_list *cnode) +static enum match_result match_chain_strings(const char *left, + const char *right) { - const char *left = cnode->srcline; - const char *right = node->srcline; enum match_result ret = MATCH_EQ; int cmp; @@ -652,10 +650,8 @@ static enum match_result match_chain_srcline(struct callchain_cursor_node *node, cmp = 1; else if (left && !right) cmp = -1; - else if (cnode->ip == node->ip) - cmp = 0; else - cmp = (cnode->ip < node->ip) ? -1 : 1; + return MATCH_ERROR; if (cmp != 0) ret = cmp < 0 ? MATCH_LT : MATCH_GT; @@ -670,10 +666,18 @@ static enum match_result match_chain(struct callchain_cursor_node *node, u64 left, right; if (callchain_param.key == CCKEY_SRCLINE) { - enum match_result match = match_chain_srcline(node, cnode); + enum match_result match = match_chain_strings(cnode->srcline, + node->srcline); + + // if no srcline is available, fallback to symbol name + if (match == MATCH_ERROR && cnode->ms.sym && node->sym) + match = match_chain_strings(cnode->ms.sym->name, + node->sym->name); if (match != MATCH_ERROR) return match; + + // otherwise fall-back to IP-based comparison below } if (cnode->ms.sym && sym && callchain_param.key == CCKEY_FUNCTION) { -- 2.13.3