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| author | David S. Miller <davem@davemloft.net> | 2018-10-12 10:33:20 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-12 10:33:20 -0700 |
| commit | 455adb3174d2c8518cef1a61140c211f6ac224d2 (patch) | |
| tree | a3c8dcaf2cd8e4bf6784349b45c758c5225a42b4 /arch | |
| parent | cfdc3170d214046b9509183fe9b9544dc644d40b (diff) | |
| download | linux-0-day-455adb3174d2c8518cef1a61140c211f6ac224d2.tar.gz linux-0-day-455adb3174d2c8518cef1a61140c211f6ac224d2.tar.xz | |
sparc: Throttle perf events properly.
Like x86 and arm, call perf_sample_event_took() in perf event
NMI interrupt handler.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/kernel/perf_event.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c index a4cc26bd89a21..67b3e6b3ce5d7 100644 --- a/arch/sparc/kernel/perf_event.c +++ b/arch/sparc/kernel/perf_event.c @@ -24,6 +24,7 @@ #include <asm/cpudata.h> #include <linux/uaccess.h> #include <linux/atomic.h> +#include <linux/sched/clock.h> #include <asm/nmi.h> #include <asm/pcr.h> #include <asm/cacheflush.h> @@ -1612,6 +1613,8 @@ static int __kprobes perf_event_nmi_handler(struct notifier_block *self, struct perf_sample_data data; struct cpu_hw_events *cpuc; struct pt_regs *regs; + u64 finish_clock; + u64 start_clock; int i; if (!atomic_read(&active_events)) @@ -1625,6 +1628,8 @@ static int __kprobes perf_event_nmi_handler(struct notifier_block *self, return NOTIFY_DONE; } + start_clock = sched_clock(); + regs = args->regs; cpuc = this_cpu_ptr(&cpu_hw_events); @@ -1663,6 +1668,10 @@ static int __kprobes perf_event_nmi_handler(struct notifier_block *self, sparc_pmu_stop(event, 0); } + finish_clock = sched_clock(); + + perf_sample_event_took(finish_clock - start_clock); + return NOTIFY_STOP; } |