void os_changeThreadPriority(Thread* thread, int newPriority)
{
FASTIVA_LATE_IMPL();
#if 0
if (newPriority < 1 || newPriority > 10) {
ALOGW("bad priority %d", newPriority);
newPriority = 5;
}
int newNice = kNiceValues[newPriority-1];
pid_t pid = thread->systemTid;
if (newNice >= ANDROID_PRIORITY_BACKGROUND) {
set_sched_policy(dvmGetSysThreadId(), SP_BACKGROUND);
} else if (getpriority(PRIO_PROCESS, pid) >= ANDROID_PRIORITY_BACKGROUND) {
set_sched_policy(dvmGetSysThreadId(), SP_FOREGROUND);
}
if (setpriority(PRIO_PROCESS, pid, newNice) != 0) {
std::string threadName(dvmGetThreadName(thread));
ALOGI("setPriority(%d) '%s' to prio=%d(n=%d) failed: %s",
pid, threadName.c_str(), newPriority, newNice, strerror(errno));
} else {
ALOGV("setPriority(%d) to prio=%d(n=%d)", pid, newPriority, newNice);
}
#endif
}
static void printWaitMessage(const DebugOutputTarget* target, const char* detail, Object* obj,
Thread* thread)
{
std::string msg(StringPrintf(" - waiting %s <%p> ", detail, obj));
if (obj->clazz != gDvm.classJavaLangClass) {
// I(16573) - waiting on <0xf5feda38> (a java.util.LinkedList)
// I(16573) - waiting on <0xf5ed54f8> (a java.lang.Class<java.lang.ref.ReferenceQueue>)
msg += "(a " + dvmHumanReadableType(obj) + ")";
}
if (thread != NULL) {
std::string threadName(dvmGetThreadName(thread));
StringAppendF(&msg, " held by tid=%d (%s)", thread->threadId, threadName.c_str());
}
dvmPrintDebugMessage(target, "%s\n", msg.c_str());
}
static void logContentionEvent(Thread *self, u4 waitMs, u4 samplePercent,
const char *ownerFileName, u4 ownerLineNumber)
{
const StackSaveArea *saveArea;
const Method *meth;
u4 relativePc;
char eventBuffer[174];
const char *fileName;
char procName[33];
char *cp;
size_t len;
int fd;
/* When a thread is being destroyed it is normal that the frame depth is zero */
if (self->interpSave.curFrame == NULL) {
return;
}
saveArea = SAVEAREA_FROM_FP(self->interpSave.curFrame);
meth = saveArea->method;
cp = eventBuffer;
/* Emit the event list length, 1 byte. */
*cp++ = 9;
/* Emit the process name, <= 37 bytes. */
fd = open("/proc/self/cmdline", O_RDONLY);
memset(procName, 0, sizeof(procName));
read(fd, procName, sizeof(procName) - 1);
close(fd);
len = strlen(procName);
cp = logWriteString(cp, procName, len);
/* Emit the sensitive thread ("main thread") status, 5 bytes. */
bool isSensitive = false;
if (gDvm.isSensitiveThreadHook != NULL) {
isSensitive = gDvm.isSensitiveThreadHook();
}
cp = logWriteInt(cp, isSensitive);
/* Emit self thread name string, <= 37 bytes. */
std::string selfName = dvmGetThreadName(self);
cp = logWriteString(cp, selfName.c_str(), selfName.size());
/* Emit the wait time, 5 bytes. */
cp = logWriteInt(cp, waitMs);
/* Emit the source code file name, <= 37 bytes. */
fileName = dvmGetMethodSourceFile(meth);
if (fileName == NULL) fileName = "";
cp = logWriteString(cp, fileName, strlen(fileName));
/* Emit the source code line number, 5 bytes. */
relativePc = saveArea->xtra.currentPc - saveArea->method->insns;
cp = logWriteInt(cp, dvmLineNumFromPC(meth, relativePc));
/* Emit the lock owner source code file name, <= 37 bytes. */
if (ownerFileName == NULL) {
ownerFileName = "";
} else if (strcmp(fileName, ownerFileName) == 0) {
/* Common case, so save on log space. */
ownerFileName = "-";
}
cp = logWriteString(cp, ownerFileName, strlen(ownerFileName));
/* Emit the source code line number, 5 bytes. */
cp = logWriteInt(cp, ownerLineNumber);
/* Emit the sample percentage, 5 bytes. */
cp = logWriteInt(cp, samplePercent);
assert((size_t)(cp - eventBuffer) <= sizeof(eventBuffer));
android_btWriteLog(EVENT_LOG_TAG_dvm_lock_sample,
EVENT_TYPE_LIST,
eventBuffer,
(size_t)(cp - eventBuffer));
}
/*
* Dump stack frames, starting from the specified frame and moving down.
*
* Each frame holds a pointer to the currently executing method, and the
* saved program counter from the caller ("previous" frame). This means
* we don't have the PC for the current method on the stack, which is
* pretty reasonable since it's in the "PC register" for the VM. Because
* exceptions need to show the correct line number we actually *do* have
* an updated version in the fame's "xtra.currentPc", but it's unreliable.
*
* Note "framePtr" could be NULL in rare circumstances.
*/
static void dumpFrames(const DebugOutputTarget* target, void* framePtr,
Thread* thread)
{
const StackSaveArea* saveArea;
const Method* method;
int checkCount = 0;
const u2* currentPc = NULL;
bool first = true;
/*
* The "currentPc" is updated whenever we execute an instruction that
* might throw an exception. Show it here.
*/
if (framePtr != NULL && !dvmIsBreakFrame(framePtr)) {
saveArea = SAVEAREA_FROM_FP(framePtr);
if (saveArea->xtra.currentPc != NULL)
currentPc = saveArea->xtra.currentPc;
}
while (framePtr != NULL) {
saveArea = SAVEAREA_FROM_FP(framePtr);
method = saveArea->method;
if (dvmIsBreakFrame(framePtr)) {
//dvmPrintDebugMessage(target, " (break frame)\n");
} else {
int relPc;
if (currentPc != NULL)
relPc = currentPc - saveArea->method->insns;
else
relPc = -1;
char* className = dvmDescriptorToDot(method->clazz->descriptor);
if (dvmIsNativeMethod(method))
dvmPrintDebugMessage(target,
" at %s.%s(Native Method)\n", className, method->name);
else {
dvmPrintDebugMessage(target,
" at %s.%s(%s:%s%d)\n",
className, method->name, dvmGetMethodSourceFile(method),
(relPc >= 0 && first) ? "~" : "",
relPc < 0 ? -1 : dvmLineNumFromPC(method, relPc));
}
free(className);
if (first) {
/*
* Decorate WAIT and MONITOR threads with some detail on
* the first frame.
*
* warning: wait status not stable, even in suspend
*/
if (thread->status == THREAD_WAIT ||
thread->status == THREAD_TIMED_WAIT)
{
Monitor* mon = thread->waitMonitor;
Object* obj = dvmGetMonitorObject(mon);
if (obj != NULL) {
className = dvmDescriptorToDot(obj->clazz->descriptor);
dvmPrintDebugMessage(target,
" - waiting on <%p> (a %s)\n", obj, className);
free(className);
}
} else if (thread->status == THREAD_MONITOR) {
Object* obj;
Thread* owner;
if (extractMonitorEnterObject(thread, &obj, &owner)) {
className = dvmDescriptorToDot(obj->clazz->descriptor);
if (owner != NULL) {
char* threadName = dvmGetThreadName(owner);
dvmPrintDebugMessage(target,
" - waiting to lock <%p> (a %s) held by threadid=%d (%s)\n",
obj, className, owner->threadId, threadName);
free(threadName);
} else {
dvmPrintDebugMessage(target,
" - waiting to lock <%p> (a %s) held by ???\n",
obj, className);
}
free(className);
}
}
}
}
/*
* Get saved PC for previous frame. There's no savedPc in a "break"
* frame, because that represents native or interpreted code
* invoked by the VM. The saved PC is sitting in the "PC register",
* a local variable on the native stack.
*/
currentPc = saveArea->savedPc;
first = false;
if (saveArea->prevFrame != NULL && saveArea->prevFrame <= framePtr) {
LOGW("Warning: loop in stack trace at frame %d (%p -> %p)\n",
checkCount, framePtr, saveArea->prevFrame);
break;
}
framePtr = saveArea->prevFrame;
checkCount++;
if (checkCount > 300) {
dvmPrintDebugMessage(target,
" ***** printed %d frames, not showing any more\n",
checkCount);
break;
}
}
dvmPrintDebugMessage(target, "\n");
}
