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authorNaga Chumbalkar <nagananda.chumbalkar@hp.com>2010-02-23 18:14:58 +0100
committerRobert Richter <robert.richter@amd.com>2010-02-26 15:14:34 +0100
commit8588d1067147e14d1dd521fbadd1d2564f8cc794 (patch)
tree2b2f5bba9c3f8547ac86a1444f8582c3834b4ea8
parent98a2e73a0690b3610f049a64154d8145e5771713 (diff)
downloadlinux-2.6.38-lt-ux500-8588d1067147e14d1dd521fbadd1d2564f8cc794.tar.gz
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@hp.com> Cc: Tony Jones <tonyj@suse.de> Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
-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());
}