From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756104AbbCLVcy (ORCPT ); Thu, 12 Mar 2015 17:32:54 -0400 Received: from mail.kernel.org ([198.145.29.136]:42116 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030329AbbCLV3G (ORCPT ); Thu, 12 Mar 2015 17:29:06 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Namhyung Kim , David Ahern , Jiri Olsa , Naohiro Aota , Peter Zijlstra , Masami Hiramatsu , Arnaldo Carvalho de Melo Subject: [PATCH 11/24] perf probe: Allow weak symbols to be probed Date: Thu, 12 Mar 2015 18:27:51 -0300 Message-Id: <1426195684-20046-12-git-send-email-acme@kernel.org> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1426195684-20046-1-git-send-email-acme@kernel.org> References: <1426195684-20046-1-git-send-email-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Namhyung Kim It currently prevents adding probes in weak symbols. But there're cases that given name is an only weak symbol so that we cannot add probe. $ perf probe -x /usr/lib/libc.so.6 -a calloc Failed to find symbol calloc in /usr/lib/libc-2.21.so Error: Failed to add events. $ nm /usr/lib/libc.so.6 | grep calloc 000000000007b1f0 t __calloc 000000000007b1f0 T __libc_calloc 000000000007b1f0 W calloc This change will result in duplicate probes when strong and weak symbols co-exist in a binary. But I think it's not a big problem since probes at the weak symbol will never be hit anyway. Signed-off-by: Namhyung Kim Tested-by: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Jiri Olsa Cc: Naohiro Aota Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20150306073129.6904.41078.stgit@localhost.localdomain Signed-off-by: Masami Hiramatsu Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-event.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 9feba0e3343e..8af8e7f55254 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -310,10 +310,8 @@ static int find_alternative_probe_point(struct debuginfo *dinfo, /* Find the address of given function */ map__for_each_symbol_by_name(map, pp->function, sym) { - if (sym->binding == STB_GLOBAL || sym->binding == STB_LOCAL) { - address = sym->start; - break; - } + address = sym->start; + break; } if (!address) { ret = -ENOENT; @@ -2485,8 +2483,7 @@ static int find_probe_functions(struct map *map, char *name) struct symbol *sym; map__for_each_symbol_by_name(map, name, sym) { - if (sym->binding == STB_GLOBAL || sym->binding == STB_LOCAL) - found++; + found++; } return found; @@ -2846,8 +2843,7 @@ static struct strfilter *available_func_filter; static int filter_available_functions(struct map *map __maybe_unused, struct symbol *sym) { - if ((sym->binding == STB_GLOBAL || sym->binding == STB_LOCAL) && - strfilter__compare(available_func_filter, sym->name)) + if (strfilter__compare(available_func_filter, sym->name)) return 0; return 1; } -- 1.9.3