Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754657Ab0FNT0s (ORCPT ); Mon, 14 Jun 2010 15:26:48 -0400 Received: from adelie.canonical.com ([91.189.90.139]:59712 "EHLO adelie.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753972Ab0FNT0r (ORCPT ); Mon, 14 Jun 2010 15:26:47 -0400 From: Chase Douglas To: Arnaldo Carvalho de Melo , Peter Zijlstra , Paul Mackerras , Ingo Molnar Cc: Masami Hiramatsu , linux-kernel@vger.kernel.org Subject: [RESEND][PATCH v2] perf probe: add kernel source path option Date: Mon, 14 Jun 2010 15:26:30 -0400 Message-Id: <1276543590-10486-1-git-send-email-chase.douglas@canonical.com> X-Mailer: git-send-email 1.7.0.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4365 Lines: 147 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. Signed-off-by: Chase Douglas --- 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..8c33aa1 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, -- 1.7.0.4 -- 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/