Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758967Ab0FRKRt (ORCPT ); Fri, 18 Jun 2010 06:17:49 -0400 Received: from hera.kernel.org ([140.211.167.34]:46867 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757267Ab0FRKRr (ORCPT ); Fri, 18 Jun 2010 06:17:47 -0400 Date: Fri, 18 Jun 2010 10:17:18 GMT From: tip-bot for Chase Douglas Cc: acme@redhat.com, linux-kernel@vger.kernel.org, paulus@samba.org, hpa@zytor.com, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, chase.douglas@canonical.com, mhiramat@redhat.com, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, paulus@samba.org, linux-kernel@vger.kernel.org, acme@redhat.com, peterz@infradead.org, tglx@linutronix.de, chase.douglas@canonical.com, mhiramat@redhat.com, mingo@elte.hu In-Reply-To: <1276543590-10486-1-git-send-email-chase.douglas@canonical.com> References: <1276543590-10486-1-git-send-email-chase.douglas@canonical.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] perf probe: Add kernel source path option Message-ID: Git-Commit-ID: 9ed7e1b85cd55dc46cb9410a23086bdaa2ff3eb9 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Fri, 18 Jun 2010 10:17:19 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5024 Lines: 159 Commit-ID: 9ed7e1b85cd55dc46cb9410a23086bdaa2ff3eb9 Gitweb: http://git.kernel.org/tip/9ed7e1b85cd55dc46cb9410a23086bdaa2ff3eb9 Author: Chase Douglas AuthorDate: Mon, 14 Jun 2010 15:26:30 -0400 Committer: Arnaldo Carvalho de Melo CommitDate: Thu, 17 Jun 2010 10:27:57 -0300 perf probe: Add kernel source path option The probe plugin requires access to the source code for some operations. The source code must be in the exact same location as specified by the DWARF tags, but sometimes the location is an absolute path that cannot be replicated by a normal user. This change adds the -s|--source option to allow the user to specify the root of the kernel source tree. Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Masami Hiramatsu LKML-Reference: <1276543590-10486-1-git-send-email-chase.douglas@canonical.com> Signed-off-by: Chase Douglas Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-probe.txt | 4 ++ tools/perf/builtin-probe.c | 2 + tools/perf/util/probe-finder.c | 58 +++++++++++++++++++++++++++++-- tools/perf/util/symbol.h | 1 + 4 files changed, 62 insertions(+), 3 deletions(-) diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt index 94a258c..ea531d9 100644 --- a/tools/perf/Documentation/perf-probe.txt +++ b/tools/perf/Documentation/perf-probe.txt @@ -31,6 +31,10 @@ OPTIONS --vmlinux=PATH:: Specify vmlinux path which has debuginfo (Dwarf binary). +-s:: +--source=PATH:: + Specify path to kernel source. + -v:: --verbose:: Be more verbose (show parsed arguments, etc). diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c index e4a4da3..5455186 100644 --- a/tools/perf/builtin-probe.c +++ b/tools/perf/builtin-probe.c @@ -182,6 +182,8 @@ static const struct option options[] = { "Show source code lines.", opt_show_lines), OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name, "file", "vmlinux pathname"), + OPT_STRING('s', "source", &symbol_conf.source_prefix, + "directory", "path to kernel source"), #endif OPT__DRY_RUN(&probe_event_dry_run), OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points, diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index d964cb1..baf6653 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -37,6 +37,7 @@ #include "event.h" #include "debug.h" #include "util.h" +#include "symbol.h" #include "probe-finder.h" /* Kprobe tracer basic type is up to u64 */ @@ -57,6 +58,55 @@ static int strtailcmp(const char *s1, const char *s2) return 0; } +/* + * Find a src file from a DWARF tag path. Prepend optional source path prefix + * and chop off leading directories that do not exist. Result is passed back as + * a newly allocated path on success. + * Return 0 if file was found and readable, -errno otherwise. + */ +static int get_real_path(const char *raw_path, char **new_path) +{ + if (!symbol_conf.source_prefix) { + if (access(raw_path, R_OK) == 0) { + *new_path = strdup(raw_path); + return 0; + } else + return -errno; + } + + *new_path = malloc((strlen(symbol_conf.source_prefix) + + strlen(raw_path) + 2)); + if (!*new_path) + return -ENOMEM; + + for (;;) { + sprintf(*new_path, "%s/%s", symbol_conf.source_prefix, + raw_path); + + if (access(*new_path, R_OK) == 0) + return 0; + + switch (errno) { + case ENAMETOOLONG: + case ENOENT: + case EROFS: + case EFAULT: + raw_path = strchr(++raw_path, '/'); + if (!raw_path) { + free(*new_path); + *new_path = NULL; + return -ENOENT; + } + continue; + + default: + free(*new_path); + *new_path = NULL; + return -errno; + } + } +} + /* Line number list operations */ /* Add a line to line number list */ @@ -1096,11 +1146,13 @@ end: static int line_range_add_line(const char *src, unsigned int lineno, struct line_range *lr) { + int ret; + /* Copy real path */ if (!lr->path) { - lr->path = strdup(src); - if (lr->path == NULL) - return -ENOMEM; + ret = get_real_path(src, &lr->path); + if (ret != 0) + return ret; } return line_list__add_line(&lr->line_list, lineno); } diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h index 10b7ff8..80e569b 100644 --- a/tools/perf/util/symbol.h +++ b/tools/perf/util/symbol.h @@ -71,6 +71,7 @@ struct symbol_conf { full_paths, show_cpu_utilization; const char *vmlinux_name, + *source_prefix, *field_sep; const char *default_guest_vmlinux_name, *default_guest_kallsyms, -- 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/