From 91064fcd698bdf5ed1423fb08f9781b1f1373648 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Thu, 11 Dec 2008 14:03:20 +0100
Subject: [PATCH] --- yaml --- r: 147145 b: refs/heads/master c:
 bae43c9945ebeef15e7952e317efb02393d3bfc7 h: refs/heads/master i:   147143:
 dd92ed722d621ec8d5660fdcb5225d364dace48c v: v3

---
 [refs]                             |  2 +-
 trunk/include/linux/perf_counter.h |  7 +++++--
 trunk/kernel/perf_counter.c        | 22 ++++++++++++++++++++++
 3 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 76e3e259f892..04268092f097 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 01b2838c4298c5e0d30b4993c195ac34dd9df61e
+refs/heads/master: bae43c9945ebeef15e7952e317efb02393d3bfc7
diff --git a/trunk/include/linux/perf_counter.h b/trunk/include/linux/perf_counter.h
index 68f6e3ad531f..30c0ec8c1ee3 100644
--- a/trunk/include/linux/perf_counter.h
+++ b/trunk/include/linux/perf_counter.h
@@ -50,8 +50,11 @@ enum hw_event_types {
 	 */
 	PERF_COUNT_CPU_CLOCK		= -1,
 	PERF_COUNT_TASK_CLOCK		= -2,
-	PERF_COUNT_PAGE_FAULTS		= -3,
-	PERF_COUNT_CONTEXT_SWITCHES	= -4,
+	/*
+	 * Future software events:
+	 */
+	/* PERF_COUNT_PAGE_FAULTS	= -3,
+	   PERF_COUNT_CONTEXT_SWITCHES	= -4, */
 };
 
 /*
diff --git a/trunk/kernel/perf_counter.c b/trunk/kernel/perf_counter.c
index 0e93fea17120..a0fe8474ee29 100644
--- a/trunk/kernel/perf_counter.c
+++ b/trunk/kernel/perf_counter.c
@@ -855,6 +855,25 @@ static const struct hw_perf_counter_ops perf_ops_cpu_clock = {
 	.hw_perf_counter_read		= cpu_clock_perf_counter_read,
 };
 
+static void task_clock_perf_counter_enable(struct perf_counter *counter)
+{
+}
+
+static void task_clock_perf_counter_disable(struct perf_counter *counter)
+{
+}
+
+static void task_clock_perf_counter_read(struct perf_counter *counter)
+{
+	atomic64_counter_set(counter, current->se.sum_exec_runtime);
+}
+
+static const struct hw_perf_counter_ops perf_ops_task_clock = {
+	.hw_perf_counter_enable		= task_clock_perf_counter_enable,
+	.hw_perf_counter_disable	= task_clock_perf_counter_disable,
+	.hw_perf_counter_read		= task_clock_perf_counter_read,
+};
+
 static const struct hw_perf_counter_ops *
 sw_perf_counter_init(struct perf_counter *counter)
 {
@@ -864,6 +883,9 @@ sw_perf_counter_init(struct perf_counter *counter)
 	case PERF_COUNT_CPU_CLOCK:
 		hw_ops = &perf_ops_cpu_clock;
 		break;
+	case PERF_COUNT_TASK_CLOCK:
+		hw_ops = &perf_ops_task_clock;
+		break;
 	default:
 		break;
 	}