perf record, x86: Print more intelligent error message when sampling fails
Print more accurate error message when "perf record" fails because
there is no APIC support, on x86.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 87f98fd..0e519c6 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -307,6 +307,12 @@
printf("\n");
error("perfcounter syscall returned with %d (%s)\n",
fd[nr_cpu][counter], strerror(err));
+
+#if defined(__i386__) || defined(__x86_64__)
+ if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
+ die("No hardware sampling interrupt available. No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.\n");
+#endif
+
die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
exit(-1);
}