Commit-ID: 8588d1067147e14d1dd521fbadd1d2564f8cc794
Gitweb: http://git.kernel.org/tip/8588d1067147e14d1dd521fbadd1d2564f8cc794
Author: Naga Chumbalkar <nagananda.chumbalkar@xxxxxx>
AuthorDate: Tue, 23 Feb 2010 18:14:58 +0100
Committer: Robert Richter <robert.richter@xxxxxxx>
CommitDate: Fri, 26 Feb 2010 15:14:34 +0100
oprofile/x86: add comment to counter-in-use warning
Currently, oprofile fails silently on platforms where a non-OS entity
such as the system firmware "enables" and uses a performance
counter. There is a warning in the code for this case.
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 the counter from the
desired event by editing the
/usr/share/oprofile/<cpu_type>/<cpu>/events
file. If the event cannot be monitored by any other counter, contact
your hardware or BIOS vendor.
Cc: Shashi Belur <shashi-kiran.belur@xxxxxx>
Cc: Tony Jones <tonyj@xxxxxxx>
Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@xxxxxx>
Signed-off-by: Robert Richter <robert.richter@xxxxxxx>
---
arch/x86/oprofile/op_x86_model.h | 9 +++++++++
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 59fa2bd..ff82a75 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());
}
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