trace: add qemu mutex lock and unlock trace events

These trace events were very useful to help me to understand and find a
reordering issue in vfio, for example:

qemu_mutex_lock locked mutex 0x10905ad8
  vfio_region_write  (0001:03:00.0:region1+0xc0, 0x2020c, 4)
qemu_mutex_unlock unlocked mutex 0x10905ad8
qemu_mutex_lock locked mutex 0x10905ad8
  vfio_region_write  (0001:03:00.0:region1+0xc4, 0xa0000, 4)
qemu_mutex_unlock unlocked mutex 0x10905ad8

that also helped me to see the desired result after the fix:

qemu_mutex_lock locked mutex 0x10905ad8
  vfio_region_write  (0001:03:00.0:region1+0xc0, 0x2000c, 4)
  vfio_region_write  (0001:03:00.0:region1+0xc4, 0xb0000, 4)
qemu_mutex_unlock unlocked mutex 0x10905ad8

So it could be a good idea to have these traces implemented. It's worth
mentioning that they should be surgically enabled during the debugging,
otherwise it can flood the trace logs with lock/unlock messages.

How to use it:
trace-event qemu_mutex_lock on|off
trace-event qemu_mutex_unlock on|off
or
trace-event qemu_mutex* on|off

Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
Message-Id: <1493054398-26013-1-git-send-email-joserz@linux.vnet.ibm.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
[Also handle trylock, cond_wait and win32; trace "unlocked" while still
 in the critical section, so that "unlocked" always comes before the
 next "locked" tracepoint. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/util/qemu-thread-win32.c b/util/qemu-thread-win32.c
index 59befd5202..653f29f442 100644
--- a/util/qemu-thread-win32.c
+++ b/util/qemu-thread-win32.c
@@ -19,6 +19,7 @@
 #include "qemu-common.h"
 #include "qemu/thread.h"
 #include "qemu/notify.h"
+#include "trace.h"
 #include <process.h>
 
 static bool name_threads;
@@ -55,6 +56,7 @@ void qemu_mutex_destroy(QemuMutex *mutex)
 void qemu_mutex_lock(QemuMutex *mutex)
 {
     AcquireSRWLockExclusive(&mutex->lock);
+    trace_qemu_mutex_locked(mutex);
 }
 
 int qemu_mutex_trylock(QemuMutex *mutex)
@@ -62,11 +64,16 @@ int qemu_mutex_trylock(QemuMutex *mutex)
     int owned;
 
     owned = TryAcquireSRWLockExclusive(&mutex->lock);
-    return !owned;
+    if (owned) {
+        trace_qemu_mutex_locked(mutex);
+        return 0;
+    }
+    return -EBUSY;
 }
 
 void qemu_mutex_unlock(QemuMutex *mutex)
 {
+    trace_qemu_mutex_unlocked(mutex);
     ReleaseSRWLockExclusive(&mutex->lock);
 }
 
@@ -118,7 +125,9 @@ void qemu_cond_broadcast(QemuCond *cond)
 
 void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex)
 {
+    trace_qemu_mutex_unlocked(mutex);
     SleepConditionVariableSRW(&cond->var, &mutex->lock, INFINITE, 0);
+    trace_qemu_mutex_locked(mutex);
 }
 
 void qemu_sem_init(QemuSemaphore *sem, int init)