archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-08-24 13:24:27 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8173715: Remove FlatProfiler

Browse source 
Obsoleted Xprof flag, removed FlatProfiler code

Reviewed-by: dholmes, coleenp, vlivanov, pliden
This commit is contained in:
Gerard Ziemski 2017-08-31 20:26:53 -05:00
parent 1d5aeeb5f1
commit 59445a845c
43 changed files with 92 additions and 2447 deletions
Download patch file Download diff file Expand all files Collapse all files

52
hotspot/src/os/linux/vm/os_linux.cpp
View file

@ -4000,11 +4000,10 @@ void os::hint_no_preempt() {}
////////////////////////////////////////////////////////////////////////////////
// suspend/resume support
// the low-level signal-based suspend/resume support is a remnant from the
// The low-level signal-based suspend/resume support is a remnant from the
// old VM-suspension that used to be for java-suspension, safepoints etc,
// within hotspot. Now there is a single use-case for this:
// - calling get_thread_pc() on the VMThread by the flat-profiler task
// that runs in the watcher thread.
// within hotspot. Currently used by JFR's OSThreadSampler
//
// The remaining code is greatly simplified from the more general suspension
// code that used to be used.
//
@ -4020,6 +4019,13 @@ void os::hint_no_preempt() {}
//
// Note that the SR_lock plays no role in this suspend/resume protocol,
// but is checked for NULL in SR_handler as a thread termination indicator.
// The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
//
// Note that resume_clear_context() and suspend_save_context() are needed
// by SR_handler(), so that fetch_frame_from_ucontext() works,
// which in part is used by:
// - Forte Analyzer: AsyncGetCallTrace()
// - StackBanging: get_frame_at_stack_banging_point()
static void resume_clear_context(OSThread *osthread) {
osthread->set_ucontext(NULL);
@ -5060,44 +5066,6 @@ void os::SuspendedThreadTask::internal_do_task() {
}
}
class PcFetcher : public os::SuspendedThreadTask {
public:
PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
ExtendedPC result();
protected:
void do_task(const os::SuspendedThreadTaskContext& context);
private:
ExtendedPC _epc;
};
ExtendedPC PcFetcher::result() {
guarantee(is_done(), "task is not done yet.");
return _epc;
}
void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
Thread* thread = context.thread();
OSThread* osthread = thread->osthread();
if (osthread->ucontext() != NULL) {
_epc = os::Linux::ucontext_get_pc((const ucontext_t *) context.ucontext());
} else {
// NULL context is unexpected, double-check this is the VMThread
guarantee(thread->is_VM_thread(), "can only be called for VMThread");
}
}
// Suspends the target using the signal mechanism and then grabs the PC before
// resuming the target. Used by the flat-profiler only
ExtendedPC os::get_thread_pc(Thread* thread) {
// Make sure that it is called by the watcher for the VMThread
assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
assert(thread->is_VM_thread(), "Can only be called for VMThread");
PcFetcher fetcher(thread);
fetcher.run();
return fetcher.result();
}
////////////////////////////////////////////////////////////////////////////////
// debug support