perf trace: Add support for syscalls vs raw_syscalls

Older kernels (e.g., RHEL6) do system call tracing via
syscalls:sys_{enter,exit} rather than raw_syscalls. Update perf-trace to
detect lack of raw_syscalls support and try syscalls.

Signed-off-by: David Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/1386211302-31303-2-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 56afe339661a87a27246afa32cd27453d2287f50..a7aa771a98e625c70258db1c44b5ee911b5aa16d 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -12,6 +12,7 @@
 #include "util/thread_map.h"
 #include "util/stat.h"
 #include "trace-event.h"
+#include "util/parse-events.h"
 
 #include <libaudit.h>
 #include <stdlib.h>
@@ -173,6 +174,10 @@ static struct perf_evsel *perf_evsel__syscall_newtp(const char *direction, void
 {
        struct perf_evsel *evsel = perf_evsel__newtp("raw_syscalls", direction);
 
+       /* older kernel (e.g., RHEL6) use syscalls:{enter,exit} */
+       if (evsel == NULL)
+               evsel = perf_evsel__newtp("syscalls", direction);
+
        if (evsel) {
                if (perf_evsel__init_syscall_tp(evsel, handler))
                        goto out_delete;
@@ -1801,10 +1806,11 @@ static int trace__record(int argc, const char **argv)
                "-R",
                "-m", "1024",
                "-c", "1",
-               "-e", "raw_syscalls:sys_enter,raw_syscalls:sys_exit",
+               "-e",
        };
 
-       rec_argc = ARRAY_SIZE(record_args) + argc;
+       /* +1 is for the event string below */
+       rec_argc = ARRAY_SIZE(record_args) + 1 + argc;
        rec_argv = calloc(rec_argc + 1, sizeof(char *));
 
        if (rec_argv == NULL)
@@ -1813,6 +1819,17 @@ static int trace__record(int argc, const char **argv)
        for (i = 0; i < ARRAY_SIZE(record_args); i++)
                rec_argv[i] = record_args[i];
 
+       /* event string may be different for older kernels - e.g., RHEL6 */
+       if (is_valid_tracepoint("raw_syscalls:sys_enter"))
+               rec_argv[i] = "raw_syscalls:sys_enter,raw_syscalls:sys_exit";
+       else if (is_valid_tracepoint("syscalls:sys_enter"))
+               rec_argv[i] = "syscalls:sys_enter,syscalls:sys_exit";
+       else {
+               pr_err("Neither raw_syscalls nor syscalls events exist.\n");
+               return -1;
+       }
+       i++;
+
        for (j = 0; j < (unsigned int)argc; j++, i++)
                rec_argv[i] = argv[j];
 
@@ -2048,6 +2065,10 @@ static int trace__replay(struct trace *trace)
 
        evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
                                                     "raw_syscalls:sys_enter");
+       /* older kernels have syscalls tp versus raw_syscalls */
+       if (evsel == NULL)
+               evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
+                                                            "syscalls:sys_enter");
        if (evsel == NULL) {
                pr_err("Data file does not have raw_syscalls:sys_enter event\n");
                goto out;
@@ -2061,6 +2082,9 @@ static int trace__replay(struct trace *trace)
 
        evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
                                                     "raw_syscalls:sys_exit");
+       if (evsel == NULL)
+               evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
+                                                            "syscalls:sys_exit");
        if (evsel == NULL) {
                pr_err("Data file does not have raw_syscalls:sys_exit event\n");
                goto out;