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perfcounters: consolidate global-disable codepaths

Browse Source 
Impact: cleanup

Simplify global disable handling.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-12-09 12:23:59 +01:00
parent 1e12567678
commit 43874d238d
1 changed files with 6 additions and 17 deletions
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23
arch/x86/kernel/cpu/perf_counter.c
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@ -33,7 +33,6 @@ static u32 perf_counter_mask __read_mostly;
struct cpu_hw_counters {
struct perf_counter *counters[MAX_HW_COUNTERS];
unsigned long used[BITS_TO_LONGS(MAX_HW_COUNTERS)];
int enable_all;
};
/*
@ -115,24 +114,13 @@ int hw_perf_counter_init(struct perf_counter *counter, s32 hw_event_type)
return 0;
}
static void __hw_perf_enable_all(void)
void hw_perf_enable_all(void)
{
wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, perf_counter_mask, 0);
}
void hw_perf_enable_all(void)
{
struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
cpuc->enable_all = 1;
__hw_perf_enable_all();
}
void hw_perf_disable_all(void)
{
struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
cpuc->enable_all = 0;
wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, 0, 0);
}
@ -385,8 +373,10 @@ perf_handle_group(struct perf_counter *leader, u64 *status, u64 *overflown)
static void __smp_perf_counter_interrupt(struct pt_regs *regs, int nmi)
{
int bit, cpu = smp_processor_id();
u64 ack, status, saved_global;
struct cpu_hw_counters *cpuc;
u64 ack, status;
rdmsrl(MSR_CORE_PERF_GLOBAL_CTRL, saved_global);
/* Disable counters globally */
wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, 0, 0);
@ -445,10 +435,9 @@ again:
goto again;
out:
/*
* Do not reenable when global enable is off:
* Restore - do not reenable when global enable is off:
*/
if (cpuc->enable_all)
__hw_perf_enable_all();
wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, saved_global, 0);
}
void smp_perf_counter_interrupt(struct pt_regs *regs)