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 56afe33..a7aa771 100644
--- 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 @@
{
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 @@
"-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 @@
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 @@
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 @@
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;