From bfd451184d80301d1ae970b1ebffde1e9c6240f9 Mon Sep 17 00:00:00 2001
From: Simon Kaempflein <s.kaempflein@gmx.de>
Date: Mon, 16 Nov 2009 15:25:53 +1000
Subject: [PATCH] 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>
---
tools/perf/builtin-record.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 87f98fdb05138..0e519c667e3ac 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -307,6 +307,12 @@ try_again:
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);
}
--
2.30.2