diff options
| author | Naga Chumbalkar <nagananda.chumbalkar@hp.com> | 2010-02-23 18:14:58 +0100 |
|---|---|---|
| committer | Robert Richter <robert.richter@amd.com> | 2010-02-26 15:14:34 +0100 |
| commit | 8588d1067147e14d1dd521fbadd1d2564f8cc794 (patch) | |
| tree | 2b2f5bba9c3f8547ac86a1444f8582c3834b4ea8 /arch/x86/oprofile | |
| parent | oprofile/x86: warn user if a counter is already active (diff) | |
| download | linux-8588d1067147e14d1dd521fbadd1d2564f8cc794.tar.xz linux-8588d1067147e14d1dd521fbadd1d2564f8cc794.zip | |
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>
Diffstat (limited to 'arch/x86/oprofile')
| -rw-r--r-- | 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 59fa2bdb0da3..ff82a755edd4 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()); } |