perf test: Allow running just a subset of the available tests

To obtain a list of available tests:

[root@emilia linux]# perf test list
 1: vmlinux symtab matches kallsyms
 2: detect open syscall event
 3: detect open syscall event on all cpus
 4: read samples using the mmap interface
 5: parse events tests
[root@emilia linux]#

To list just a subset:

[root@emilia linux]# perf test list syscall
 2: detect open syscall event
 3: detect open syscall event on all cpus
[root@emilia linux]#

To run a subset:

[root@emilia linux]# perf test detect
 2: detect open syscall event: Ok
 3: detect open syscall event on all cpus: Ok
[root@emilia linux]#

Specific tests can be chosen by number:

[root@emilia linux]# perf test 1 3 parse
 1: vmlinux symtab matches kallsyms: Ok
 3: detect open syscall event on all cpus: Ok
 5: parse events tests: Ok
[root@emilia linux]#

Now to write more tests!

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-nqec2145qfxdgimux28aw7v8@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 67 insertions, 22 deletions

diff --git a/tools/perf/Documentation/perf-test.txt b/tools/perf/Documentation/perf-test.txt
index 2c3b462f64b0..b24ac40fcd58 100644
--- a/tools/perf/Documentation/perf-test.txt
+++ b/tools/perf/Documentation/perf-test.txt
@@ -8,13 +8,19 @@ perf-test - Runs sanity tests.
 SYNOPSIS
 --------
 [verse]
-'perf test <options>'
+'perf test [<options>] [{list <test-name-fragment>|[<test-name-fragments>|<test-numbers>]}]'
 
 DESCRIPTION
 -----------
 This command does assorted sanity tests, initially through linked routines but
 also will look for a directory with more tests in the form of scripts.
 
+To get a list of available tests use 'perf test list', specifying a test name
+fragment will show all tests that have it.
+
+To run just specific tests, inform test name fragments or the numbers obtained
+from 'perf test list'.
+
 OPTIONS
 -------
 -v::
diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
index 77d68bfb79da..3ab27223fc67 100644
--- a/tools/perf/builtin-test.c
+++ b/tools/perf/builtin-test.c
@@ -15,8 +15,6 @@
 #include "util/thread_map.h"
 #include "../../include/linux/hw_breakpoint.h"
 
-static long page_size;
-
 static int vmlinux_matches_kallsyms_filter(struct map *map __used, struct symbol *sym)
 {
         bool *visited = symbol__priv(sym);
@@ -32,6 +30,7 @@ static int test__vmlinux_matches_kallsyms(void)
         struct map *kallsyms_map, *vmlinux_map;
         struct machine kallsyms, vmlinux;
         enum map_type type = MAP__FUNCTION;
+        long page_size = sysconf(_SC_PAGE_SIZE);
         struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
 
         /*
@@ -871,41 +870,81 @@ static struct test {
         },
 };
 
-static int __cmd_test(void)
+static bool perf_test__matches(int curr, int argc, const char *argv[])
 {
-        int i = 0;
+        int i;
+
+        if (argc == 0)
+                return true;
+
+        for (i = 0; i < argc; ++i) {
+                char *end;
+                long nr = strtoul(argv[i], &end, 10);
+
+                if (*end == '\0') {
+                        if (nr == curr + 1)
+                                return true;
+                        continue;
+                }
 
-        page_size = sysconf(_SC_PAGE_SIZE);
+                if (strstr(tests[curr].desc, argv[i]))
+                        return true;
+        }
+
+        return false;
+}
+
+static int __cmd_test(int argc, const char *argv[])
+{
+        int i = 0;
 
         while (tests[i].func) {
-                int err;
-                pr_info("%2d: %s:", i + 1, tests[i].desc);
+                int curr = i++, err;
+
+                if (!perf_test__matches(curr, argc, argv))
+                        continue;
+
+                pr_info("%2d: %s:", i, tests[curr].desc);
                 pr_debug("\n--- start ---\n");
-                err = tests[i].func();
-                pr_debug("---- end ----\n%s:", tests[i].desc);
+                err = tests[curr].func();
+                pr_debug("---- end ----\n%s:", tests[curr].desc);
                 pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
-                ++i;
         }
 
         return 0;
 }
 
-static const char * const test_usage[] = {
-        "perf test [<options>]",
-        NULL,
-};
+static int perf_test__list(int argc, const char **argv)
+{
+        int i = 0;
+
+        while (tests[i].func) {
+                int curr = i++;
+
+                if (argc > 1 && !strstr(tests[curr].desc, argv[1]))
+                        continue;
+
+                pr_info("%2d: %s\n", i, tests[curr].desc);
+        }
+
+        return 0;
+}
 
-static const struct option test_options[] = {
+int cmd_test(int argc, const char **argv, const char *prefix __used)
+{
+        const char * const test_usage[] = {
+        "perf test [<options>] [{list <test-name-fragment>|[<test-name-fragments>|<test-numbers>]}]",
+        NULL,
+        };
+        const struct option test_options[] = {
         OPT_INTEGER('v', "verbose", &verbose,
                     "be more verbose (show symbol address, etc)"),
         OPT_END()
-};
+        };
 
-int cmd_test(int argc, const char **argv, const char *prefix __used)
-{
         argc = parse_options(argc, argv, test_options, test_usage, 0);
-        if (argc)
-                usage_with_options(test_usage, test_options);
+        if (argc >= 1 && !strcmp(argv[0], "list"))
+                return perf_test__list(argc, argv);
 
         symbol_conf.priv_size = sizeof(int);
         symbol_conf.sort_by_name = true;
@@ -916,5 +955,5 @@ int cmd_test(int argc, const char **argv, const char *prefix __used)
 
         setup_pager();
 
-        return __cmd_test();
+        return __cmd_test(argc, argv);
 }