From patchwork Thu Jan 2 22:06:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 234646 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, 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 0DFB2C3276C for ; Thu, 2 Jan 2020 22:42:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D90A3217F4 for ; Thu, 2 Jan 2020 22:42:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004975; bh=7uIewrwMlJTMVu2DZJRYjZ+aAlxPBmbyZH4tB/oGrYU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VIGV3rx9bpN/a3bD8kPf6c6pvUneJye5ABVgCwK+2IHChCyhyQrc23dFVE7gOi8Ti z0FLB30n37QqMHZ50A96UNuKAyP3klyed510t5z/M0PopDYeMIIdlOACPI8cM23KTT 0c2ZKVbGBTgVADtQ+XaKbAPX79QfQ8MCp0R5mpHc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730588AbgABWfc (ORCPT ); Thu, 2 Jan 2020 17:35:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:45334 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730831AbgABWfb (ORCPT ); Thu, 2 Jan 2020 17:35:31 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6499321835; Thu, 2 Jan 2020 22:35:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004530; bh=7uIewrwMlJTMVu2DZJRYjZ+aAlxPBmbyZH4tB/oGrYU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PJf4UtR3FAtxsB2cvr+CF0i+oT2YoOdXojREXrPe2q/pJqtXSDSPikPHyNc4BIGAc N7NcXkFw6NFxgYpiTjot6ujhkAIsbthyQQxxbCrm70hTEX4dxVv3Tlgy8sFQH6boGU RlbQw4bistKR1Bl+5jG0SUjaeKShzn0OOiM3u8G8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Masami Hiramatsu , Arnaldo Carvalho de Melo , Namhyung Kim , Ravi Bangoria , "Steven Rostedt (VMware)" , Tom Zanussi , Sasha Levin Subject: [PATCH 4.4 045/137] perf probe: Return a better scope DIE if there is no best scope Date: Thu, 2 Jan 2020 23:06:58 +0100 Message-Id: <20200102220552.669785035@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102220546.618583146@linuxfoundation.org> References: <20200102220546.618583146@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 d917f83e8e85..5ca8836b16e7 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; }