[PATCH v2 4/4] perf: Support perf -vv

Jin Yao
2018-03-28T07:03:13Z

We keep having bug reports that when users build perf on their own,
but they don't install some needed libraries such as libelf,
libbfd/libibery.

The perf can build, but it is missing important functionality.

This patch provides a new option '-vv' which will print the
compiled-in status of libraries.

The 'perf -vv' is equal to 'perf -version --build-options'.

For example:

$ ./perf -vv or ./perf -version --build-options
perf version 4.13.rc5.gcb1183
dwarf: [ on ]
dwarf_getlocations: [ on ]
glibc: [ on ]
gtk2: [ on ]
libaudit: [ OFF ]
libbfd: [ on ]
libelf: [ on ]
libnuma: [ on ]
numa_num_possible_cpus: [ on ]
libperl: [ on ]
libpython: [ on ]
libslang: [ on ]
libcrypto: [ on ]
libunwind: [ on ]
libdw-dwarf-unwind: [ on ]
zlib: [ on ]
lzma: [ on ]
get_cpuid: [ on ]
bpf: [ on ]
[ on ]: library is compiled-in
[ OFF ]: library is disabled in make configuration
OR library is not installed in build environment

v2:
---
Use a global variable version_verbose to count the number of 'v'.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/perf.c | 22 ++++++++++++++++++----
tools/perf/perf.h | 1 +
2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 1b3fc8e..355219e 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -32,7 +32,7 @@
#include <linux/kernel.h>

const char perf_usage_string[] =
- "perf [--version] [--help] [OPTIONS] COMMAND [ARGS]";
+ "perf [--version [--build-options]] [--help] [OPTIONS] COMMAND [ARGS]";

const char perf_more_info_string[] =
"See 'perf help COMMAND' for more information on a specific command.";
@@ -163,6 +163,8 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
{
int handled = 0;

+ version_verbose = 0;
+
while (*argc > 0) {
const char *cmd = (*argv)[0];
if (cmd[0] != '-')
@@ -185,9 +187,21 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
break;
}

- if (!strcmp(cmd, "-v")) {
- (*argv)[0] = "--version";
- break;
+ if (strstarts(cmd, "-v")) {
+ int i;
+
+ for (i = 2; cmd[i]; i++) {
+ if (cmd[i] == 'v')
+ version_verbose++;
+ }
+
+ /*
+ * Only support -v and -vv now
+ */
+ if (version_verbose < 2) {
+ (*argv)[0] = "--version";
+ break;
+ }
}

/*
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 8fec1ab..a1a9795 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -84,6 +84,7 @@ struct record_opts {
struct option;
extern const char * const *record_usage;
extern struct option *record_options;
+extern int version_verbose;

int record__parse_freq(const struct option *opt, const char *str, int unset);
#endif
--
2.7.4