linux-kernel - [PATCH 3.18 07/90] sparc: Throttle perf events properly.

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Message-Id: <20181119162621.950798107@linuxfoundation.org>
Date:   Mon, 19 Nov 2018 17:28:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 3.18 07/90] sparc: Throttle perf events properly.

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "David S. Miller" <davem@...emloft.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@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/sparc/kernel/perf_event.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- 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_hand
 	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_hand
 		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_hand
 			sparc_pmu_stop(event, 0);
 	}
 
+	finish_clock = sched_clock();
+
+	perf_sample_event_took(finish_clock - start_clock);
+
 	return NOTIFY_STOP;
 }