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Enhanced scheduler tracing. The reschedule tracing entry does now record

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more information of the unscheduled thread, namely its new state and, if
waiting, also the object it is going to wait on. When scheduler tracing
level 2 is enabled, additionally the address where the thread was
preempted is recorded. The latter could be interesting for analyzing
race condition bugs.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27168 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2008-08-23 00:12:27 +00:00
parent 982413718d
commit 79b5db483c
1 changed files with 57 additions and 3 deletions
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src/system/kernel/scheduler.cpp
+57 -3
View File
@@ -12,6 +12,7 @@
#include <OS.h>
#include <arch/debug.h>
#include <kscheduler.h>
#include <thread.h>
#include <timer.h>
@@ -109,17 +110,64 @@ public:
SchedulerTraceEntry(thread),
fPreviousID(previous->id),
fCPU(previous->cpu->cpu_num),
fPriority(thread->priority)
fPriority(thread->priority),
fPreviousState(previous->state),
fPreviousWaitObjectType(previous->wait.type)
{
fName = alloc_tracing_buffer_strcpy(thread->name, B_OS_NAME_LENGTH,
false);
#if SCHEDULER_TRACING >= 2
if (fPreviousState == B_THREAD_READY)
fPreviousPC = arch_debug_get_interrupt_pc();
else
#endif
fPreviousWaitObject = previous->wait.object;
Initialized();
}
virtual void AddDump(TraceOutput& out)
{
out.Print("schedule %ld \"%s\", priority %d (from %ld, CPU %ld)", fID,
fName, fPriority, fPreviousID, fCPU);
out.Print("schedule %ld \"%s\", priority %d, CPU %ld, "
"previous thread: %ld (", fID, fName, fPriority, fCPU, fPreviousID);
if (fPreviousState == B_THREAD_WAITING) {
switch (fPreviousWaitObjectType) {
case THREAD_BLOCK_TYPE_SEMAPHORE:
out.Print("sem %ld", (sem_id)(addr_t)fPreviousWaitObject);
break;
case THREAD_BLOCK_TYPE_CONDITION_VARIABLE:
out.Print("cvar %p", fPreviousWaitObject);
break;
case THREAD_BLOCK_TYPE_SNOOZE:
out.Print("snooze()");
break;
case THREAD_BLOCK_TYPE_SIGNAL:
out.Print("signal");
break;
case THREAD_BLOCK_TYPE_MUTEX:
out.Print("mutex %p", fPreviousWaitObject);
break;
case THREAD_BLOCK_TYPE_RW_LOCK:
out.Print("rwlock %p", fPreviousWaitObject);
break;
case THREAD_BLOCK_TYPE_OTHER:
out.Print("other (%p)", fPreviousWaitObject);
// We could print the string, but it might come from a
// kernel module that has already been unloaded.
break;
default:
out.Print("unknown (%p)", fPreviousWaitObject);
break;
}
#if SCHEDULER_TRACING >= 2
} else if (fPreviousState == B_THREAD_READY) {
out.Print("ready at %p", fPreviousPC);
#endif
} else
out.Print("%s", thread_state_to_text(NULL, fPreviousState));
out.Print(")");
}
thread_id PreviousThreadID() const { return fPreviousID; }
@@ -129,6 +177,12 @@ private:
int32 fCPU;
char* fName;
uint8 fPriority;
uint8 fPreviousState;
uint16 fPreviousWaitObjectType;
union {
const void* fPreviousWaitObject;
void* fPreviousPC;
};
};
} // namespace SchedulerTracing