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oprofile/x86: add comment to counter-in-use warning

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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>
This commit is contained in:
Naga Chumbalkar 2010-02-23 18:14:58 +01:00 committed by Robert Richter
parent 98a2e73a06
commit 8588d10671
1 changed files with 9 additions and 0 deletions
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9
arch/x86/oprofile/op_x86_model.h
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@ -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());
}