From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9227AC43603 for ; Tue, 10 Dec 2019 22:37:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 645AD2077B for ; Tue, 10 Dec 2019 22:37:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576017420; bh=K/yGSRCiMcC8vZYUp1qETucf02tyGYGSAGexTmkVrYs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=AZVQbcNipRQobweawFzrzQX5ysv8Plp2hyUl+us5CgzeGHFlE6mGspY8zML7yqM5I p0XENbQacivUZzLv8sQ4h/dlObFuWEm8KdrfyfRF9cPEdcielAWCeCeYX4RtRzmuWJ SQagP39oqzgvhVwCSCujdl6VV0ueozVlmI5ajU5w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729277AbfLJWg7 (ORCPT ); Tue, 10 Dec 2019 17:36:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:55490 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730166AbfLJWeM (ORCPT ); Tue, 10 Dec 2019 17:34:12 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2E44A2077B; Tue, 10 Dec 2019 22:34:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576017252; bh=K/yGSRCiMcC8vZYUp1qETucf02tyGYGSAGexTmkVrYs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hfLgilM0PS3QEAV6iTtOgx9E9G31TNCcLm0BS4cDr7+beBsHcKKH29/P0Qr/nS+LN ISPQpKqLrl/ZplStZri6E9OF5xwpWFz7v+vvWOTx9a6PlKSfIK/LNQRoEAgh0nHGqc U37DHtggx+LOSyPXlcuKIxXajjiBkcZQRZTHbAes= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Masami Hiramatsu , Arnaldo Carvalho de Melo , Namhyung Kim , Ravi Bangoria , Steven Rostedt , Tom Zanussi , Sasha Levin Subject: [PATCH AUTOSEL 4.4 47/71] perf probe: Return a better scope DIE if there is no best scope Date: Tue, 10 Dec 2019 17:32:52 -0500 Message-Id: <20191210223316.14988-47-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191210223316.14988-1-sashal@kernel.org> References: <20191210223316.14988-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masami Hiramatsu [ Upstream commit c701636aeec4c173208697d68da6e4271125564b ] Make find_best_scope() returns innermost DIE at given address if there is no best matched scope DIE. Since Gcc sometimes generates intuitively strange line info which is out of inlined function address range, we need this fixup. Without this, sometimes perf probe failed to probe on a line inside an inlined function: # perf probe -D ksys_open:3 Failed to find scope of probe point. Error: Failed to add events. With this fix, 'perf probe' can probe it: # perf probe -D ksys_open:3 p:probe/ksys_open _text+25707308 p:probe/ksys_open_1 _text+25710596 p:probe/ksys_open_2 _text+25711114 p:probe/ksys_open_3 _text+25711343 p:probe/ksys_open_4 _text+25714058 p:probe/ksys_open_5 _text+2819653 p:probe/ksys_open_6 _text+2819701 Signed-off-by: Masami Hiramatsu Tested-by: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: Ravi Bangoria Cc: Steven Rostedt (VMware) Cc: Tom Zanussi Link: http://lore.kernel.org/lkml/157291300887.19771.14936015360963292236.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/probe-finder.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index d917f83e8e855..5ca8836b16e74 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -746,6 +746,16 @@ static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) return 0; } +/* Return innermost DIE */ +static int find_inner_scope_cb(Dwarf_Die *fn_die, void *data) +{ + struct find_scope_param *fsp = data; + + memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); + fsp->found = true; + return 1; +} + /* Find an appropriate scope fits to given conditions */ static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) { @@ -757,8 +767,13 @@ static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) .die_mem = die_mem, .found = false, }; + int ret; - cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); + ret = cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, + &fsp); + if (!ret && !fsp.found) + cu_walk_functions_at(&pf->cu_die, pf->addr, + find_inner_scope_cb, &fsp); return fsp.found ? die_mem : NULL; } -- 2.20.1