Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752144AbcDZJCq (ORCPT ); Tue, 26 Apr 2016 05:02:46 -0400 Received: from mail.kernel.org ([198.145.29.136]:46788 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752051AbcDZJCn (ORCPT ); Tue, 26 Apr 2016 05:02:43 -0400 From: Masami Hiramatsu To: Arnaldo Carvalho de Melo Cc: Masami Hiramatsu , linux-kernel@vger.kernel.org, Namhyung Kim , Peter Zijlstra , Ingo Molnar , Hemant Kumar , Ananth N Mavinakayanahalli Subject: [PATCH perf/core v4 03/19] perf buildid-cache: Fall back to the old style build-id cache Date: Tue, 26 Apr 2016 18:02:33 +0900 Message-Id: <20160426090233.11891.70554.stgit@devbox> X-Mailer: git-send-email 2.1.0 In-Reply-To: <20160426090200.11891.43944.stgit@devbox> References: <20160426090200.11891.43944.stgit@devbox> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3247 Lines: 97 Fall back to the old style build-id cache (~/.debug//) if possible. Because there is old build-id cache under ~/.debug, perf has to check if the old entry is there instead of returning an error. Or, user have to remove ~/.debug completely. This patch introduces fallback code to try using old-style buildid caches. To update the cached entry, you just need to add a cache. It automatically removes old cache entry and make a new one in new style (~/.debug///[elf|vdso|kallsyms]). IOW, without this patch, "perf buildid-cache --add" always gets errors when adding existing binaries. ---- # perf buildid-cache -a /usr/lib64/libc-2.20.so,/usr/bin/gcc Couldn't add /usr/bin/gcc: Not a directory Couldn't add /usr/lib64/libc-2.20.so: Not a directory ---- Moreover, --update option removes only symlink, thus the build-id cache is corrupted. This fixes above issues. Signed-off-by: Masami Hiramatsu --- tools/perf/util/build-id.c | 17 ++++++++++++++++- tools/perf/util/symbol.c | 13 +++++++++---- 2 files changed, 25 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c index 46a8bcc..b035483 100644 --- a/tools/perf/util/build-id.c +++ b/tools/perf/util/build-id.c @@ -155,6 +155,12 @@ static char *build_id_cache__linkname(const char *sbuild_id, char *bf, return bf; } +static bool __is_regular_file(const char *pathname) +{ + struct stat sb; + return stat(pathname, &sb) == 0 && S_ISREG(sb.st_mode); +} + static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso) { return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf"); @@ -177,7 +183,11 @@ char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size) if (!linkname) return NULL; - ret = asnprintf(&bf, size, "%s/%s", linkname, + /* Check if old style build_id cache */ + if (__is_regular_file(linkname)) + ret = asnprintf(&bf, size, "%s", linkname); + else + ret = asnprintf(&bf, size, "%s/%s", linkname, build_id_cache__basename(is_kallsyms, is_vdso)); if (ret < 0 || (!alloc && size < (unsigned int)ret)) bf = NULL; @@ -445,6 +455,11 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name, if (!dir_name) goto out_free; + /* Remove old style build-id cache */ + if (__is_regular_file(dir_name)) + if (unlink(dir_name)) + goto out_free; + if (mkdir_p(dir_name, 0755)) goto out_free; diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index c57cb47..9463c7d 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1687,11 +1687,16 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map) scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s/kallsyms", buildid_dir, sbuild_id); - + /* Try old style kallsyms cache */ if (access(path, F_OK)) { - pr_err("No kallsyms or vmlinux with build-id %s was found\n", - sbuild_id); - return NULL; + scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s", + buildid_dir, sbuild_id); + + if (access(path, F_OK)) { + pr_err("No kallsyms or vmlinux with build-id %s was found\n", + sbuild_id); + return NULL; + } } return strdup(path);