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Subject[PATCH 5/5] perf buildid-list: New plumbing command
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

With this we can list the buildids in a perf.data file so that we can
pipe them to other, distro specific tools that from the buildids can
figure out separate packages (foo-debuginfo) where we can find the
matching symtabs so that perf report can do its job.

E.g:

[acme@doppio linux-2.6-tip]$ perf buildid-list | head -5
8e08b117e5458ad3f85da16d42d0fc5cd21c5869
520c2387a587cc5acfcf881e27dba1caaeab4b1f
ec8dd400904ddfcac8b1c343263a790f977159dc
7caedbca5a6d8ab39a7fe44bd28c07d3e14a3f3f
379bb828fd08859dbea73279f04abefabc95a6a3
[acme@doppio linux-2.6-tip]$ perf buildid-list -v | head -5
8e08b117e5458ad3f85da16d42d0fc5cd21c5869 /sbin/init
520c2387a587cc5acfcf881e27dba1caaeab4b1f /lib64/ld-2.10.1.so
ec8dd400904ddfcac8b1c343263a790f977159dc /lib64/libc-2.10.1.so
7caedbca5a6d8ab39a7fe44bd28c07d3e14a3f3f /sbin/udevd
379bb828fd08859dbea73279f04abefabc95a6a3 /lib64/libdl-2.10.1.so
[acme@doppio linux-2.6-tip]$
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/Documentation/perf-buildid-list.txt | 34 +++++++
tools/perf/Makefile | 1 +
tools/perf/builtin-buildid-list.c | 116 ++++++++++++++++++++++++
tools/perf/builtin.h | 1 +
tools/perf/command-list.txt | 1 +
tools/perf/perf.c | 1 +
6 files changed, 154 insertions(+), 0 deletions(-)
create mode 100644 tools/perf/Documentation/perf-buildid-list.txt
create mode 100644 tools/perf/builtin-buildid-list.c
diff --git a/tools/perf/Documentation/perf-buildid-list.txt b/tools/perf/Documentation/perf-buildid-list.txt
new file mode 100644
index 0000000..abab34e
--- /dev/null
+++ b/tools/perf/Documentation/perf-buildid-list.txt
@@ -0,0 +1,34 @@
+perf-buildid-list(1)
+====================
+
+NAME
+----
+perf-buildid-list - List the buildids in a perf.data file
+
+SYNOPSIS
+--------
+[verse]
+'perf buildid-list <options>'
+
+DESCRIPTION
+-----------
+This command displays the buildids found in a perf.data file, so that other
+tools can be used to fetch packages with matching symbol tables for use by
+perf report.
+
+OPTIONS
+-------
+-i::
+--input=::
+ Input file name. (default: perf.data)
+-f::
+--force::
+ Don't do ownership validation.
+-v::
+--verbose::
+ Be more verbose, showing the name of the DSOs after the buildids.
+
+SEE ALSO
+--------
+linkperf:perf-record[1], linkperf:perf-top[1],
+linkperf:perf-report[1]
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index cd42c97..3dbb5c5 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -431,6 +431,7 @@ BUILTIN_OBJS += bench/sched-pipe.o

BUILTIN_OBJS += builtin-help.o
BUILTIN_OBJS += builtin-sched.o
+BUILTIN_OBJS += builtin-buildid-list.o
BUILTIN_OBJS += builtin-list.o
BUILTIN_OBJS += builtin-record.o
BUILTIN_OBJS += builtin-report.o
diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
new file mode 100644
index 0000000..2e377e1
--- /dev/null
+++ b/tools/perf/builtin-buildid-list.c
@@ -0,0 +1,116 @@
+/*
+ * builtin-buildid-list.c
+ *
+ * Builtin buildid-list command: list buildids in perf.data
+ *
+ * Copyright (C) 2009, Red Hat Inc.
+ * Copyright (C) 2009, Arnaldo Carvalho de Melo <acme@redhat.com>
+ */
+#include "builtin.h"
+#include "perf.h"
+#include "util/cache.h"
+#include "util/data_map.h"
+#include "util/debug.h"
+#include "util/header.h"
+#include "util/parse-options.h"
+#include "util/symbol.h"
+
+static char const *input_name = "perf.data";
+static int force;
+
+static const char *const buildid_list_usage[] = {
+ "perf report [<options>]",
+ NULL
+};
+
+static const struct option options[] = {
+ OPT_STRING('i', "input", &input_name, "file",
+ "input file name"),
+ OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
+ OPT_BOOLEAN('v', "verbose", &verbose,
+ "be more verbose (show counter open errors, etc)"),
+ OPT_END()
+};
+
+static int perf_file_section__process_buildids(struct perf_file_section *self,
+ int feat, int fd)
+{
+ if (feat != HEADER_BUILD_ID)
+ return 0;
+
+ if (lseek(fd, self->offset, SEEK_SET) < 0) {
+ pr_warning("Failed to lseek to %Ld offset for buildids!\n",
+ self->offset);
+ return -1;
+ }
+
+ if (perf_header__read_build_ids(fd, self->offset, self->size)) {
+ pr_warning("Failed to read buildids!\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static int __cmd_buildid_list(void)
+{
+ int err = -1;
+ struct perf_header *header;
+ struct perf_file_header f_header;
+ struct stat input_stat;
+ int input = open(input_name, O_RDONLY);
+
+ if (input < 0) {
+ pr_err("failed to open file: %s", input_name);
+ if (!strcmp(input_name, "perf.data"))
+ pr_err(" (try 'perf record' first)");
+ pr_err("\n");
+ goto out;
+ }
+
+ err = fstat(input, &input_stat);
+ if (err < 0) {
+ perror("failed to stat file");
+ goto out_close;
+ }
+
+ if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
+ pr_err("file %s not owned by current user or root\n",
+ input_name);
+ goto out_close;
+ }
+
+ if (!input_stat.st_size) {
+ pr_info("zero-sized file, nothing to do!\n");
+ goto out_close;
+ }
+
+ err = -1;
+ header = perf_header__new();
+ if (header == NULL)
+ goto out_close;
+
+ if (perf_file_header__read(&f_header, header, input) < 0) {
+ pr_warning("incompatible file format");
+ goto out_close;
+ }
+
+ err = perf_header__process_sections(header, input,
+ perf_file_section__process_buildids);
+
+ if (err < 0)
+ goto out_close;
+
+ dsos__fprintf_buildid(stdout);
+out_close:
+ close(input);
+out:
+ return err;
+}
+
+int cmd_buildid_list(int argc, const char **argv, const char *prefix __used)
+{
+ argc = parse_options(argc, argv, options, buildid_list_usage, 0);
+ setup_pager();
+ return __cmd_buildid_list();
+}
diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h
index d4fe12d..9b02d85 100644
--- a/tools/perf/builtin.h
+++ b/tools/perf/builtin.h
@@ -16,6 +16,7 @@ extern int check_pager_config(const char *cmd);

extern int cmd_annotate(int argc, const char **argv, const char *prefix);
extern int cmd_bench(int argc, const char **argv, const char *prefix);
+extern int cmd_buildid_list(int argc, const char **argv, const char *prefix);
extern int cmd_help(int argc, const char **argv, const char *prefix);
extern int cmd_sched(int argc, const char **argv, const char *prefix);
extern int cmd_list(int argc, const char **argv, const char *prefix);
diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt
index 1642a88..983ae29 100644
--- a/tools/perf/command-list.txt
+++ b/tools/perf/command-list.txt
@@ -4,6 +4,7 @@
#
perf-annotate mainporcelain common
perf-bench mainporcelain common
+perf-build-list mainporcelain common
perf-list mainporcelain common
perf-sched mainporcelain common
perf-record mainporcelain common
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 9cd55b9..89b82ac 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -287,6 +287,7 @@ static void handle_internal_command(int argc, const char **argv)
static struct cmd_struct commands[] = {
{ "help", cmd_help, 0 },
{ "list", cmd_list, 0 },
+ { "buildid-list", cmd_buildid_list, 0 },
{ "record", cmd_record, 0 },
{ "report", cmd_report, 0 },
{ "bench", cmd_bench, 0 },
--
1.6.2.5


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