diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_counter.c | 23 |
1 files changed, 6 insertions, 17 deletions
diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c index 919ec46679b2..6a93d1f04d97 100644 --- a/arch/x86/kernel/cpu/perf_counter.c +++ b/arch/x86/kernel/cpu/perf_counter.c @@ -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) -{ - 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(); + wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, perf_counter_mask, 0); } 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) |