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oprofile/x86: warn user if a counter is already active

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This patch generates a warning if a counter is already active.

Implemented for AMD and P6 models. P4 is not supported.

Cc: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Cc: Shashi Belur <shashi-kiran.belur@hp.com>
Cc: Tony Jones <tonyj@suse.de>
Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2010-02-23 18:14:58 +01:00
parent ba52078e19
commit 98a2e73a06
3 changed files with 31 additions and 2 deletions
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11
arch/x86/oprofile/op_model_amd.c
View File

@ -194,9 +194,18 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
/* clear all counters */
for (i = 0; i < NUM_CONTROLS; ++i) {
if (unlikely(!msrs->controls[i].addr))
if (unlikely(!msrs->controls[i].addr)) {
if (counter_config[i].enabled && !smp_processor_id())
/*
* counter is reserved, this is on all
* cpus, so report only for cpu #0
*/
op_x86_warn_reserved(i);
continue;
}
rdmsrl(msrs->controls[i].addr, val);
if (val & ARCH_PERFMON_EVENTSEL0_ENABLE)
op_x86_warn_in_use(i);
val &= model->reserved;
wrmsrl(msrs->controls[i].addr, val);
}

11
arch/x86/oprofile/op_model_ppro.c
View File

@ -82,9 +82,18 @@ static void ppro_setup_ctrs(struct op_x86_model_spec const *model,
/* clear all counters */
for (i = 0; i < num_counters; ++i) {
if (unlikely(!msrs->controls[i].addr))
if (unlikely(!msrs->controls[i].addr)) {
if (counter_config[i].enabled && !smp_processor_id())
/*
* counter is reserved, this is on all
* cpus, so report only for cpu #0
*/
op_x86_warn_reserved(i);
continue;
}
rdmsrl(msrs->controls[i].addr, val);
if (val & ARCH_PERFMON_EVENTSEL0_ENABLE)
op_x86_warn_in_use(i);
val &= model->reserved;
wrmsrl(msrs->controls[i].addr, val);
}

11
arch/x86/oprofile/op_x86_model.h
View File

@ -57,6 +57,17 @@ struct op_x86_model_spec {
struct op_counter_config;
static inline void op_x86_warn_in_use(int counter)
{
pr_warning("oprofile: counter #%d on cpu #%d may already be used\n",
counter, smp_processor_id());
}
static inline void op_x86_warn_reserved(int counter)
{
pr_warning("oprofile: counter #%d is already reserved\n", counter);
}
extern u64 op_x86_get_ctrl(struct op_x86_model_spec const *model,
struct op_counter_config *counter_config);
extern int op_x86_phys_to_virt(int phys);