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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49836C433EF for ; Fri, 4 Mar 2022 09:10:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236589AbiCDJKy (ORCPT ); Fri, 4 Mar 2022 04:10:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44894 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236612AbiCDJKx (ORCPT ); Fri, 4 Mar 2022 04:10:53 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 82CDA151D32; Fri, 4 Mar 2022 01:10:05 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4742E143D; Fri, 4 Mar 2022 01:10:05 -0800 (PST) Received: from e121896.arm.com (unknown [10.57.42.166]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 81C273F73D; Fri, 4 Mar 2022 01:10:03 -0800 (PST) From: James Clark To: acme@kernel.org, linux-perf-users@vger.kernel.org, coresight@lists.linaro.org, olsajiri@gmail.com Cc: James Clark , Denis Nikitin , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , linux-kernel@vger.kernel.org Subject: [PATCH v2 1/1] perf: Set build-id using build-id header on new mmap records Date: Fri, 4 Mar 2022 09:09:56 +0000 Message-Id: <20220304090956.2048712-2-james.clark@arm.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20220304090956.2048712-1-james.clark@arm.com> References: <20220304090956.2048712-1-james.clark@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org MMAP records that occur after the build-id header is parsed do not have their build-id set even if the filename matches an entry from the header. Set the build-id on these dsos as long as the MMAP record doesn't have its own build-id set. This fixes an issue with off target analysis where the local version of a dso is loaded rather than one from ~/.debug via a build-id. Reported-by: Denis Nikitin Signed-off-by: James Clark --- tools/perf/util/dso.h | 1 + tools/perf/util/header.c | 1 + tools/perf/util/map.c | 20 +++++++++++++++++--- 3 files changed, 19 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index 011da3924fc1..3a9fd4d389b5 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -167,6 +167,7 @@ struct dso { enum dso_load_errno load_errno; u8 adjust_symbols:1; u8 has_build_id:1; + u8 header_build_id:1; u8 has_srcline:1; u8 hit:1; u8 annotate_warned:1; diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 6da12e522edc..571d73d4f976 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2200,6 +2200,7 @@ static int __event_process_build_id(struct perf_record_header_build_id *bev, build_id__init(&bid, bev->data, size); dso__set_build_id(dso, &bid); + dso->header_build_id = 1; if (dso_space != DSO_SPACE__USER) { struct kmod_path m = { .name = NULL, }; diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c index 1803d3887afe..e0aa4a254583 100644 --- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -127,7 +127,7 @@ struct map *map__new(struct machine *machine, u64 start, u64 len, if (map != NULL) { char newfilename[PATH_MAX]; - struct dso *dso; + struct dso *dso, *header_bid_dso; int anon, no_dso, vdso, android; android = is_android_lib(filename); @@ -183,9 +183,23 @@ struct map *map__new(struct machine *machine, u64 start, u64 len, } dso->nsinfo = nsi; - if (build_id__is_defined(bid)) + if (build_id__is_defined(bid)) { dso__set_build_id(dso, bid); - + } else { + /* + * If the mmap event had no build ID, search for an existing dso from the + * build ID header by name. Otherwise only the dso loaded at the time of + * reading the header will have the build ID set and all future mmaps will + * have it missing. + */ + down_read(&machine->dsos.lock); + header_bid_dso = __dsos__find(&machine->dsos, filename, false); + up_read(&machine->dsos.lock); + if (header_bid_dso && header_bid_dso->header_build_id) { + dso__set_build_id(dso, &header_bid_dso->bid); + dso->header_build_id = 1; + } + } dso__put(dso); } return map; -- 2.28.0