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-rw-r--r--arch/x86/oprofile/op_x86_model.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/oprofile/op_x86_model.h b/arch/x86/oprofile/op_x86_model.h
index 59fa2bdb0da..ff82a755edd 100644
--- a/arch/x86/oprofile/op_x86_model.h
+++ b/arch/x86/oprofile/op_x86_model.h
@@ -59,6 +59,15 @@ struct op_counter_config;
static inline void op_x86_warn_in_use(int counter)
{
+ /*
+ * The warning indicates an already running counter. If
+ * oprofile doesn't collect data, then try using a different
+ * performance counter on your platform to monitor the desired
+ * event. Delete counter #%d from the desired event by editing
+ * the /usr/share/oprofile/%s/<cpu>/events file. If the event
+ * cannot be monitored by any other counter, contact your
+ * hardware or BIOS vendor.
+ */
pr_warning("oprofile: counter #%d on cpu #%d may already be used\n",
counter, smp_processor_id());
}