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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>
This commit is contained in:
David S. Miller 2018-10-12 10:33:20 -07:00
parent cfdc3170d2
commit 455adb3174
1 changed files with 9 additions and 0 deletions
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9
arch/sparc/kernel/perf_event.c
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@ -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;
}