1 files changed, 32 insertions, 26 deletions

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 0b58e24c7ccb..dc7a694b61fe 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1215,6 +1215,7 @@ struct trace {
         bool                    summary_only;
         bool                    show_comm;
         bool                    show_tool_stats;
+        bool                    trace_syscalls;
         int                     trace_pgfaults;
 };
 
@@ -1927,17 +1928,19 @@ static int trace__record(struct trace *trace, int argc, const char **argv)
         for (i = 0; i < ARRAY_SIZE(record_args); i++)
                 rec_argv[j++] = record_args[i];
 
-        for (i = 0; i < sc_args_nr; i++)
-                rec_argv[j++] = sc_args[i];
-
-        /* event string may be different for older kernels - e.g., RHEL6 */
-        if (is_valid_tracepoint("raw_syscalls:sys_enter"))
-                rec_argv[j++] = "raw_syscalls:sys_enter,raw_syscalls:sys_exit";
-        else if (is_valid_tracepoint("syscalls:sys_enter"))
-                rec_argv[j++] = "syscalls:sys_enter,syscalls:sys_exit";
-        else {
-                pr_err("Neither raw_syscalls nor syscalls events exist.\n");
-                return -1;
+        if (trace->trace_syscalls) {
+                for (i = 0; i < sc_args_nr; i++)
+                        rec_argv[j++] = sc_args[i];
+
+                /* event string may be different for older kernels - e.g., RHEL6 */
+                if (is_valid_tracepoint("raw_syscalls:sys_enter"))
+                        rec_argv[j++] = "raw_syscalls:sys_enter,raw_syscalls:sys_exit";
+                else if (is_valid_tracepoint("syscalls:sys_enter"))
+                        rec_argv[j++] = "syscalls:sys_enter,syscalls:sys_exit";
+                else {
+                        pr_err("Neither raw_syscalls nor syscalls events exist.\n");
+                        return -1;
+                }
         }
 
         if (trace->trace_pgfaults & TRACE_PFMAJ)
@@ -2010,10 +2013,13 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
                 goto out;
         }
 
-        if (perf_evlist__add_syscall_newtp(evlist, trace__sys_enter, trace__sys_exit))
+        if (trace->trace_syscalls &&
+            perf_evlist__add_syscall_newtp(evlist, trace__sys_enter,
+                                           trace__sys_exit))
                 goto out_error_tp;
 
-        perf_evlist__add_vfs_getname(evlist);
+        if (trace->trace_syscalls)
+                perf_evlist__add_vfs_getname(evlist);
 
         if ((trace->trace_pgfaults & TRACE_PFMAJ) &&
             perf_evlist__add_pgfault(evlist, PERF_COUNT_SW_PAGE_FAULTS_MAJ))
@@ -2215,13 +2221,10 @@ static int trace__replay(struct trace *trace)
         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;
-        }
 
-        if (perf_evsel__init_syscall_tp(evsel, trace__sys_enter) < 0 ||
-            perf_evsel__init_sc_tp_ptr_field(evsel, args)) {
+        if (evsel &&
+            (perf_evsel__init_syscall_tp(evsel, trace__sys_enter) < 0 ||
+            perf_evsel__init_sc_tp_ptr_field(evsel, args))) {
                 pr_err("Error during initialize raw_syscalls:sys_enter event\n");
                 goto out;
         }
@@ -2231,13 +2234,9 @@ static int trace__replay(struct trace *trace)
         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;
-        }
-
-        if (perf_evsel__init_syscall_tp(evsel, trace__sys_exit) < 0 ||
-            perf_evsel__init_sc_tp_uint_field(evsel, ret)) {
+        if (evsel &&
+            (perf_evsel__init_syscall_tp(evsel, trace__sys_exit) < 0 ||
+            perf_evsel__init_sc_tp_uint_field(evsel, ret))) {
                 pr_err("Error during initialize raw_syscalls:sys_exit event\n");
                 goto out;
         }
@@ -2440,6 +2439,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
                 },
                 .output = stdout,
                 .show_comm = true,
+                .trace_syscalls = true,
         };
         const char *output_name = NULL;
         const char *ev_qualifier_str = NULL;
@@ -2479,6 +2479,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
                     "Show all syscalls and summary with statistics"),
         OPT_CALLBACK_DEFAULT('F', "pf", &trace.trace_pgfaults, "all|maj|min",
                      "Trace pagefaults", parse_pagefaults, "maj"),
+        OPT_BOOLEAN(0, "syscalls", &trace.trace_syscalls, "Trace syscalls"),
         OPT_END()
         };
         int err;
@@ -2499,6 +2500,11 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
         if (trace.summary_only)
                 trace.summary = trace.summary_only;
 
+        if (!trace.trace_syscalls && !trace.trace_pgfaults) {
+                pr_err("Please specify something to trace.\n");
+                return -1;
+        }
+
         if (output_name != NULL) {
                 err = trace__open_output(&trace, output_name);
                 if (err < 0) {