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perf_counter: provide major/minor page fault software events

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Provide separate sw counters for major and minor page faults.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-03-13 12:21:34 +01:00 committed by Ingo Molnar
parent 7dd1fcc258
commit ac17dc8e58
4 changed files with 21 additions and 17 deletions
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5
arch/powerpc/mm/fault.c
View File

@ -312,6 +312,7 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
}
if (ret & VM_FAULT_MAJOR) {
current->maj_flt++;
perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MAJ, 1, 0, regs);
#ifdef CONFIG_PPC_SMLPAR
if (firmware_has_feature(FW_FEATURE_CMO)) {
preempt_disable();
@ -319,8 +320,10 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
preempt_enable();
}
#endif
} else
} else {
current->min_flt++;
perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MIN, 1, 0, regs);
}
up_read(&mm->mmap_sem);
return 0;

7
arch/x86/mm/fault.c
View File

@ -1140,10 +1140,13 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code)
return;
}
if (fault & VM_FAULT_MAJOR)
if (fault & VM_FAULT_MAJOR) {
tsk->maj_flt++;
else
perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MAJ, 1, 0, regs);
} else {
tsk->min_flt++;
perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MIN, 1, 0, regs);
}
check_v8086_mode(regs, address, tsk);

4
include/linux/perf_counter.h
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@ -49,8 +49,10 @@ enum hw_event_types {
PERF_COUNT_PAGE_FAULTS = -3,
PERF_COUNT_CONTEXT_SWITCHES = -4,
PERF_COUNT_CPU_MIGRATIONS = -5,
PERF_COUNT_PAGE_FAULTS_MIN = -6,
PERF_COUNT_PAGE_FAULTS_MAJ = -7,
PERF_SW_EVENTS_MIN = -6,
PERF_SW_EVENTS_MIN = -8,
};
/*

22
kernel/perf_counter.c
View File

@ -1503,6 +1503,12 @@ static void perf_swcounter_disable(struct perf_counter *counter)
perf_swcounter_update(counter);
}
static const struct hw_perf_counter_ops perf_ops_generic = {
.enable = perf_swcounter_enable,
.disable = perf_swcounter_disable,
.read = perf_swcounter_read,
};
/*
* Software counter: cpu wall time clock
*/
@ -1603,16 +1609,6 @@ static const struct hw_perf_counter_ops perf_ops_task_clock = {
.read = task_clock_perf_counter_read,
};
/*
* Software counter: page faults
*/
static const struct hw_perf_counter_ops perf_ops_page_faults = {
.enable = perf_swcounter_enable,
.disable = perf_swcounter_disable,
.read = perf_swcounter_read,
};
/*
* Software counter: context switches
*/
@ -1753,9 +1749,9 @@ sw_perf_counter_init(struct perf_counter *counter)
hw_ops = &perf_ops_cpu_clock;
break;
case PERF_COUNT_PAGE_FAULTS:
if (!(counter->hw_event.exclude_user ||
counter->hw_event.exclude_kernel))
hw_ops = &perf_ops_page_faults;
case PERF_COUNT_PAGE_FAULTS_MIN:
case PERF_COUNT_PAGE_FAULTS_MAJ:
hw_ops = &perf_ops_generic;
break;
case PERF_COUNT_CONTEXT_SWITCHES:
if (!counter->hw_event.exclude_kernel)