ARM: dump stats and process info on context switches

This patch enables dumping statistics and Linux process information on
context switch boundaries (__switch_to() calls) that are used for
Streamline integration (a graphical statistics viewer from ARM).

1 files changed, 34 insertions, 0 deletions

diff --git a/src/mem/request.hh b/src/mem/request.hh
index f6406e2c5..11f1c74b3 100644
--- a/src/mem/request.hh
+++ b/src/mem/request.hh
@@ -1,4 +1,16 @@
 /*
+ * Copyright (c) 2012 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
  * Copyright (c) 2002-2005 The Regents of The University of Michigan
  * All rights reserved.
  *
@@ -47,6 +59,24 @@
 #include "base/types.hh"
 #include "sim/core.hh"
 
+/**
+ * Special TaskIds that are used for per-context-switch stats dumps
+ * and Cache Occupancy. Having too many tasks seems to be a problem
+ * with vector stats. 1024 seems to be a reasonable number that
+ * doesn't cause a problem with stats and is large enough to realistic
+ * benchmarks (Linux/Android boot, BBench, etc.)
+ */
+
+namespace ContextSwitchTaskId {
+    enum TaskId {
+        MaxNormalTaskId = 1021, /* Maximum number of normal tasks */
+        Prefetcher = 1022, /* For cache lines brought in by prefetcher */
+        DMA = 1023, /* Mostly Table Walker */
+        Unknown = 1024,
+        NumTaskId
+    };
+}
+
 class Request;
 
 typedef Request* RequestPtr;
@@ -117,6 +147,10 @@ class Request
     static const MasterID invldMasterId = USHRT_MAX;
     /** @} */
 
+    /** Invalid or unknown Pid. Possible when operating system is not present
+     *  or has not assigned a pid yet */
+    static const uint32_t invldPid = UINT_MAX;
+
   private:
     typedef uint8_t PrivateFlagsType;
     typedef ::Flags<PrivateFlagsType> PrivateFlags;