perf mem: Add -e record option

Adding -e option for perf mem record command, to be able to specify
memory event directly.

Get list of available events:

  $ perf mem record -e list
  ldlat-loads
  ldlat-stores

Monitor ldlat-loads:
  $ perf mem record -e ldlat-loads true

Committer notes:

Further testing:

  # perf mem record -e ldlat-loads true
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.020 MB perf.data (10 samples) ]
  # perf evlist
  cpu/mem-loads,ldlat=30/P
  #

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1455525293-8671-6-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 59 insertions, 4 deletions

diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index 36c56a4b778b..b3f8a89ede40 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -7,6 +7,7 @@
 #include "util/session.h"
 #include "util/data.h"
 #include "util/mem-events.h"
+#include "util/debug.h"
 
 #define MEM_OPERATION_LOAD      0x1
 #define MEM_OPERATION_STORE     0x2
@@ -22,11 +23,55 @@ struct perf_mem {
         DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
 };
 
+static int parse_record_events(const struct option *opt,
+                               const char *str, int unset __maybe_unused)
+{
+        struct perf_mem *mem = *(struct perf_mem **)opt->value;
+        int j;
+
+        if (strcmp(str, "list")) {
+                if (!perf_mem_events__parse(str)) {
+                        mem->operation = 0;
+                        return 0;
+                }
+                exit(-1);
+        }
+
+        for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
+                struct perf_mem_event *e = &perf_mem_events[j];
+
+                fprintf(stderr, "%-20s%s",
+                        e->tag, verbose ? "" : "\n");
+                if (verbose)
+                        fprintf(stderr, " [%s]\n", e->name);
+        }
+        exit(0);
+}
+
+static const char * const __usage[] = {
+        "perf mem record [<options>] [<command>]",
+        "perf mem record [<options>] -- <command> [<options>]",
+        NULL
+};
+
+static const char * const *record_mem_usage = __usage;
+
 static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
 {
         int rec_argc, i = 0, j;
         const char **rec_argv;
         int ret;
+        struct option options[] = {
+        OPT_CALLBACK('e', "event", &mem, "event",
+                     "event selector. use 'perf mem record -e list' to list available events",
+                     parse_record_events),
+        OPT_INCR('v', "verbose", &verbose,
+                 "be more verbose (show counter open errors, etc)"),
+        OPT_END()
+        };
+
+        argc = parse_options(argc, argv, options, record_mem_usage,
+                             PARSE_OPT_STOP_AT_NON_OPTION);
 
         rec_argc = argc + 7; /* max number of arguments */
         rec_argv = calloc(rec_argc + 1, sizeof(char *));
@@ -35,10 +80,11 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
 
         rec_argv[i++] = "record";
 
-        if (mem->operation & MEM_OPERATION_LOAD) {
+        if (mem->operation & MEM_OPERATION_LOAD)
                 perf_mem_events[PERF_MEM_EVENTS__LOAD].record = true;
+
+        if (perf_mem_events[PERF_MEM_EVENTS__LOAD].record)
                 rec_argv[i++] = "-W";
-        }
 
         rec_argv[i++] = "-d";
 
@@ -50,9 +96,19 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
                 rec_argv[i++] = perf_mem_events[j].name;
         };
 
-        for (j = 1; j < argc; j++, i++)
+        for (j = 0; j < argc; j++, i++)
                 rec_argv[i] = argv[j];
 
+        if (verbose > 0) {
+                pr_debug("calling: record ");
+
+                while (rec_argv[j]) {
+                        pr_debug("%s ", rec_argv[j]);
+                        j++;
+                }
+                pr_debug("\n");
+        }
+
         ret = cmd_record(i, rec_argv, NULL);
         free(rec_argv);
         return ret;
@@ -299,7 +355,6 @@ int cmd_mem(int argc, const char **argv, const char *prefix __maybe_unused)
                 NULL
         };
 
-
         argc = parse_options_subcommand(argc, argv, mem_options, mem_subcommands,
                                         mem_usage, PARSE_OPT_STOP_AT_NON_OPTION);