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-rw-r--r--src/arch/arm/ArmSystem.py1
-rw-r--r--src/arch/arm/linux/system.cc104
-rw-r--r--src/arch/arm/linux/system.hh42
3 files changed, 144 insertions, 3 deletions
diff --git a/src/arch/arm/ArmSystem.py b/src/arch/arm/ArmSystem.py
index db0febe18..3ca9b8573 100644
--- a/src/arch/arm/ArmSystem.py
+++ b/src/arch/arm/ArmSystem.py
@@ -71,3 +71,4 @@ class LinuxArmSystem(ArmSystem):
"File that contains the Device Tree Blob. Don't use DTB if empty.")
early_kernel_symbols = Param.Bool(False,
"enable early kernel symbol tables before MMU")
+ enable_context_switch_stats_dump = Param.Bool(False, "enable stats/task info dumping at context switch boundaries")
diff --git a/src/arch/arm/linux/system.cc b/src/arch/arm/linux/system.cc
index 1347e472d..b06439406 100644
--- a/src/arch/arm/linux/system.cc
+++ b/src/arch/arm/linux/system.cc
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2010 ARM Limited
+ * Copyright (c) 2010-2012 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -44,19 +44,24 @@
#include "arch/arm/linux/system.hh"
#include "arch/arm/isa_traits.hh"
#include "arch/arm/utility.hh"
+#include "arch/generic/linux/threadinfo.hh"
#include "base/loader/object_file.hh"
#include "base/loader/symtab.hh"
+#include "cpu/base.hh"
+#include "cpu/pc_event.hh"
#include "cpu/thread_context.hh"
#include "debug/Loader.hh"
#include "kern/linux/events.hh"
#include "mem/fs_translating_port_proxy.hh"
#include "mem/physical.hh"
+#include "sim/stat_control.hh"
using namespace ArmISA;
using namespace Linux;
LinuxArmSystem::LinuxArmSystem(Params *p)
- : ArmSystem(p)
+ : ArmSystem(p),
+ enableContextSwitchStatsDump(p->enable_context_switch_stats_dump)
{
#ifndef NDEBUG
kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
@@ -206,6 +211,9 @@ LinuxArmSystem::~LinuxArmSystem()
delete uDelaySkipEvent;
if (constUDelaySkipEvent)
delete constUDelaySkipEvent;
+
+ if (dumpStatsPCEvent)
+ delete dumpStatsPCEvent;
}
LinuxArmSystem *
@@ -213,3 +221,95 @@ LinuxArmSystemParams::create()
{
return new LinuxArmSystem(this);
}
+
+void
+LinuxArmSystem::startup()
+{
+ if (enableContextSwitchStatsDump) {
+ dumpStatsPCEvent = addKernelFuncEvent<DumpStatsPCEvent>("__switch_to");
+ if (!dumpStatsPCEvent)
+ panic("dumpStatsPCEvent not created!");
+
+ std::string task_filename = "tasks.txt";
+ taskFile = simout.create(name() + "." + task_filename);
+
+ for (int i = 0; i < _numContexts; i++) {
+ ThreadContext *tc = threadContexts[i];
+ uint32_t pid = tc->getCpuPtr()->getPid();
+ if (pid != Request::invldPid) {
+ mapPid(tc, pid);
+ tc->getCpuPtr()->taskId(taskMap[pid]);
+ }
+ }
+ }
+}
+
+void
+LinuxArmSystem::mapPid(ThreadContext *tc, uint32_t pid)
+{
+ // Create a new unique identifier for this pid
+ std::map<uint32_t, uint32_t>::iterator itr = taskMap.find(pid);
+ if (itr == taskMap.end()) {
+ uint32_t map_size = taskMap.size();
+ if (map_size > ContextSwitchTaskId::MaxNormalTaskId + 1) {
+ warn_once("Error out of identifiers for cache occupancy stats");
+ taskMap[pid] = ContextSwitchTaskId::Unknown;
+ } else {
+ taskMap[pid] = map_size;
+ }
+ }
+}
+
+/** This function is called whenever the the kernel function
+ * "__switch_to" is called to change running tasks.
+ *
+ * r0 = task_struct of the previously running process
+ * r1 = task_info of the previously running process
+ * r2 = task_info of the next process to run
+ */
+void
+DumpStatsPCEvent::process(ThreadContext *tc)
+{
+ Linux::ThreadInfo ti(tc);
+ Addr task_descriptor = tc->readIntReg(2);
+ uint32_t pid = ti.curTaskPID(task_descriptor);
+ uint32_t tgid = ti.curTaskTGID(task_descriptor);
+ std::string next_task_str = ti.curTaskName(task_descriptor);
+
+ // Streamline treats pid == -1 as the kernel process.
+ // Also pid == 0 implies idle process (except during Linux boot)
+ int32_t mm = ti.curTaskMm(task_descriptor);
+ bool is_kernel = (mm == 0);
+ if (is_kernel && (pid != 0)) {
+ pid = -1;
+ tgid = -1;
+ next_task_str = "kernel";
+ }
+
+ LinuxArmSystem* sys = dynamic_cast<LinuxArmSystem *>(tc->getSystemPtr());
+ if (!sys) {
+ panic("System is not LinuxArmSystem while getting Linux process info!");
+ }
+ std::map<uint32_t, uint32_t>& taskMap = sys->taskMap;
+
+ // Create a new unique identifier for this pid
+ sys->mapPid(tc, pid);
+
+ // Set cpu task id, output process info, and dump stats
+ tc->getCpuPtr()->taskId(taskMap[pid]);
+ tc->getCpuPtr()->setPid(pid);
+
+ std::ostream* taskFile = sys->taskFile;
+
+ // Task file is read by cache occupancy plotting script or
+ // Streamline conversion script.
+ ccprintf(*taskFile,
+ "tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n",
+ curTick(), taskMap[pid], tc->cpuId(), (int) pid, (int) tgid,
+ next_task_str);
+ taskFile->flush();
+
+ // Dump and reset statistics
+ Stats::schedStatEvent(true, true, curTick(), 0);
+}
+
diff --git a/src/arch/arm/linux/system.hh b/src/arch/arm/linux/system.hh
index caf018cb9..feed8cfaa 100644
--- a/src/arch/arm/linux/system.hh
+++ b/src/arch/arm/linux/system.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2010 ARM Limited
+ * Copyright (c) 2010-2012 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -43,15 +43,24 @@
#ifndef __ARCH_ARM_LINUX_SYSTEM_HH__
#define __ARCH_ARM_LINUX_SYSTEM_HH__
+#include <cstdio>
+#include <map>
#include <string>
#include <vector>
#include "arch/arm/system.hh"
+#include "base/output.hh"
#include "kern/linux/events.hh"
#include "params/LinuxArmSystem.hh"
+#include "sim/core.hh"
+
+class DumpStatsPCEvent;
class LinuxArmSystem : public ArmSystem
{
+ protected:
+ DumpStatsPCEvent *dumpStatsPCEvent;
+
public:
/** Boilerplate params code */
typedef LinuxArmSystemParams Params;
@@ -61,6 +70,20 @@ class LinuxArmSystem : public ArmSystem
return dynamic_cast<const Params *>(_params);
}
+ /** When enabled, dump stats/task info on context switches for
+ * Streamline and per-thread cache occupancy studies, etc. */
+ bool enableContextSwitchStatsDump;
+
+ /** This map stores a mapping of OS process IDs to internal Task IDs. The
+ * mapping is done because the stats system doesn't tend to like vectors
+ * that are much greater than 1000 items and the entire process space is
+ * 65K. */
+ std::map<uint32_t, uint32_t> taskMap;
+
+ /** This is a file that is placed in the run directory that prints out
+ * mappings between taskIds and OS process IDs */
+ std::ostream* taskFile;
+
LinuxArmSystem(Params *p);
~LinuxArmSystem();
@@ -68,6 +91,12 @@ class LinuxArmSystem : public ArmSystem
bool adderBootUncacheable(Addr a);
+ void startup();
+
+ /** This function creates a new task Id for the given pid.
+ * @param tc thread context that is currentyl executing */
+ void mapPid(ThreadContext* tc, uint32_t pid);
+
private:
#ifndef NDEBUG
/** Event to halt the simulator if the kernel calls panic() */
@@ -97,5 +126,16 @@ class LinuxArmSystem : public ArmSystem
Addr penReleaseAddr;
};
+class DumpStatsPCEvent : public PCEvent
+{
+ public:
+ DumpStatsPCEvent(PCEventQueue *q, const std::string &desc, Addr addr)
+ : PCEvent(q, desc, addr)
+ {}
+
+ virtual void process(ThreadContext* tc);
+};
+
+
#endif // __ARCH_ARM_LINUX_SYSTEM_HH__
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 17:30:11 +0000