Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752294AbaDZRSQ (ORCPT ); Sat, 26 Apr 2014 13:18:16 -0400 Received: from smtp.gentoo.org ([140.211.166.183]:48748 "EHLO smtp.gentoo.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751582AbaDZRSO (ORCPT ); Sat, 26 Apr 2014 13:18:14 -0400 From: Richard Yao To: Peter Zijlstra Cc: Paul Mackerras , Arnaldo Carvalho de Melo , Adrian Hunter , David Ahern , jiri Olsa , Stephane Eranian , Frederic Weisbecker , linux-kernel@vger.kernel.org, Richard Yao Subject: [PATCH] perf machine: Search for modules in %s/lib/modules/%s Date: Sat, 26 Apr 2014 13:17:55 -0400 Message-Id: <1398532675-13684-1-git-send-email-ryao@gentoo.org> X-Mailer: git-send-email 1.8.3.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Modules installed outside of the kernel's build system should go into "%s/lib/modules/%s/extra", but at present, perf will only look at them when they are in "%s/lib/modules/%s/kernel". Lets encourage good citizenship by relaxing this requirement to "%s/lib/modules/%s". This way open source modules that are out-of-tree have no incentive to start populating a directory reserved for in-kernel modules and I can stop hex-editing my system's perf binary when profiling OSS out-of-tree modules. Feedback from Namhyung Kim correctly revealed that the hex-edits that I had been doing meant that perf was also traversing the build and source symlinks in %s/lib/modules/%s. That is undesireable, so we explicitly exclude them from traversal with a minor tweak to the traversal routine. Signed-off-by: Richard Yao --- tools/perf/util/machine.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index a53cd0b..27c2a5e 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -717,7 +717,7 @@ static char *get_kernel_version(const char *root_dir) } static int map_groups__set_modules_path_dir(struct map_groups *mg, - const char *dir_name) + const char *dir_name, int depth) { struct dirent *dent; DIR *dir = opendir(dir_name); @@ -742,7 +742,15 @@ static int map_groups__set_modules_path_dir(struct map_groups *mg, !strcmp(dent->d_name, "..")) continue; - ret = map_groups__set_modules_path_dir(mg, path); + /* Do not follow top-level source and build symlinks */ + if (depth == 0) { + if (!strcmp(dent->d_name, "source") || + !strcmp(dent->d_name, "build")) + continue; + } + + ret = map_groups__set_modules_path_dir(mg, path, + depth + 1); if (ret < 0) goto out; } else { @@ -786,11 +794,11 @@ static int machine__set_modules_path(struct machine *machine) if (!version) return -1; - snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel", + snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s", machine->root_dir, version); free(version); - return map_groups__set_modules_path_dir(&machine->kmaps, modules_path); + return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0); } static int machine__create_module(void *arg, const char *name, u64 start) -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/