Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 3.18 2/5] sparc: Throttle perf events properly. | Date | Tue, 30 Oct 2018 09:32:31 -0400 |
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From: "David S. Miller" <davem@davemloft.net>
[ Upstream commit 455adb3174d2c8518cef1a61140c211f6ac224d2 ]
Like x86 and arm, call perf_sample_event_took() in perf event NMI interrupt handler.
Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- arch/sparc/kernel/perf_event.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c index 8536532970bb..c7647acf86b9 100644 --- a/arch/sparc/kernel/perf_event.c +++ b/arch/sparc/kernel/perf_event.c @@ -23,6 +23,7 @@ #include <asm/cpudata.h> #include <asm/uaccess.h> #include <linux/atomic.h> +#include <linux/sched/clock.h> #include <asm/nmi.h> #include <asm/pcr.h> #include <asm/cacheflush.h> @@ -1586,6 +1587,8 @@ 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)) @@ -1599,6 +1602,8 @@ 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); @@ -1637,6 +1642,10 @@ 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; } -- 2.17.1
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