diff -r 000000000000 -r a41df078684a kernel/eka/include/kernperflogger.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/include/kernperflogger.h	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,77 @@
+// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// Definition of some macros that can be used for simple profiling device drivers etc. They are for use from kernel side only.
+// The macros create timestamped entries in the BTrace log buffer, see <e32BTrace.h> for details.
+// Note that for the succcessfull logging category BTrace::EKernPerfLog shall be enabled along with whole tracing.
+// See "BTrace" and "BTracemode" keywords in appropriate "header.iby" file.
+// 
+//
+
+/**
+ @file
+ @publishedPartner
+ @released
+*/
+
+#ifndef KERN_PERF_LOGGER_H
+#define KERN_PERF_LOGGER_H
+
+
+#ifdef __KERNEL_MODE__
+
+#include <e32btrace.h>
+
+
+/*
+Logging with zero user data parameters.
+The trace will consist of: Fast Counter Timestamp, Context, PC value and Tick Count
+
+@param  aSubCategory    8-bit  integer that specifies logging subcategory. Logging category is BTrace::EKernPerfLog
+*/
+#define PERF_LOG0(aSubCategory)  BTraceContextPc4(BTrace::EKernPerfLog, (aSubCategory), NKern::TickCount())
+
+
+/*
+Logging with one user data word parameter.
+The trace will consist of: Fast Counter Timestamp, Context, PC value, aUserData value and Tick Count
+
+
+@param  aSubCategory    8-bit  integer that specifies logging subcategory. Logging category is BTrace::EKernPerfLog
+@param  aUserData       32-bit user data
+*/
+#define PERF_LOG1(aSubCategory,aUserData)   BTraceContextPc8(BTrace::EKernPerfLog, (aSubCategory), (aUserData),  NKern::TickCount())
+
+
+/*
+Logging with 2 user data words parameters.
+The trace will consist of: Fast Counter Timestamp, Context, PC value, aUserData, aUserData2 values and Tick Count
+
+
+@param  aSubCategory    8-bit  integer that specifies logging subcategory. Logging category is BTrace::EKernPerfLog
+@param  aUserData       32-bit user data, word 1
+@param  aUserData2      32-bit user data, word 2
+*/
+#define PERF_LOG2(aSubCategory,aUserData,aUserData2)   BTraceContextPc12(BTrace::EKernPerfLog, (aSubCategory), (aUserData), (aUserData2), NKern::TickCount())
+
+
+/** default trace, just for simplicity */
+#define PERF_LOG PERF_LOG2
+
+
+
+#endif //__KERNEL_MODE__
+
+#endif //KERN_PERF_LOGGER_H
+
+