From f68a486001635e28f4542780bfeb685cfa4371ad Mon Sep 17 00:00:00 2001
From: Pawel Dziepak <pdziepak@quarnos.org>
Date: Sat, 28 Dec 2013 18:55:39 +0100
Subject: [PATCH] scheduler: Ignore time used by the profiler implementation

---
 .../kernel/scheduler/scheduler_profiler.cpp    | 18 ++++++++++++++++--
 .../kernel/scheduler/scheduler_profiler.h      |  1 +
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/system/kernel/scheduler/scheduler_profiler.cpp b/src/system/kernel/scheduler/scheduler_profiler.cpp
index e0746c1838..64759f52f7 100644
--- a/src/system/kernel/scheduler/scheduler_profiler.cpp
+++ b/src/system/kernel/scheduler/scheduler_profiler.cpp
@@ -55,6 +55,8 @@ Profiler::Profiler()
 void
 Profiler::EnterFunction(int32 cpu, const char* functionName)
 {
+	bigtime_t start = system_time();
+
 	FunctionData* function = _FindFunction(functionName);
 	if (function == NULL)
 		return;
@@ -67,27 +69,39 @@ Profiler::EnterFunction(int32 cpu, const char* functionName)
 	ASSERT(fFunctionStackPointers[cpu] < kMaxFunctionStackEntries);
 
 	stackEntry->fFunction = function;
-	stackEntry->fEntryTime = system_time();
+	stackEntry->fEntryTime = start;
 	stackEntry->fOthersTime = 0;
+
+	bigtime_t stop = system_time();
+	stackEntry->fProfilerTime = stop - start;
 }
 
 
 void
 Profiler::ExitFunction(int32 cpu, const char* functionName)
 {
+	bigtime_t start = system_time();
+
 	ASSERT(fFunctionStackPointers[cpu] > 0);
 	fFunctionStackPointers[cpu]--;
 	FunctionEntry* stackEntry
 		= &fFunctionStacks[cpu][fFunctionStackPointers[cpu]];
 
-	bigtime_t timeSpent = system_time() - stackEntry->fEntryTime;
+	bigtime_t timeSpent = start - stackEntry->fEntryTime;
+	timeSpent -= stackEntry->fProfilerTime;
+
 	atomic_add64(&stackEntry->fFunction->fTimeInclusive, timeSpent);
 	atomic_add64(&stackEntry->fFunction->fTimeExclusive,
 		timeSpent - stackEntry->fOthersTime);
 
+	bigtime_t profilerTime = stackEntry->fProfilerTime;
 	if (fFunctionStackPointers[cpu] > 0) {
 		stackEntry = &fFunctionStacks[cpu][fFunctionStackPointers[cpu] - 1];
 		stackEntry->fOthersTime += timeSpent;
+		stackEntry->fProfilerTime += profilerTime;
+
+		bigtime_t stop = system_time();
+		stackEntry->fProfilerTime += stop - start;
 	}
 }
 
diff --git a/src/system/kernel/scheduler/scheduler_profiler.h b/src/system/kernel/scheduler/scheduler_profiler.h
index fb87c160a8..2b999827a8 100644
--- a/src/system/kernel/scheduler/scheduler_profiler.h
+++ b/src/system/kernel/scheduler/scheduler_profiler.h
@@ -57,6 +57,7 @@ private:
 
 			bigtime_t		fEntryTime;
 			bigtime_t		fOthersTime;
+			bigtime_t		fProfilerTime;
 	};
 
 			uint32			_FunctionCount() const;