8231627: ThreadsListHandleInErrorHandlingTest.java fails in printing all threads
Reviewed-by: eosterlund, coleenp, pchilanomate, sspitsyn
This commit is contained in:
Daniel D. Daugherty
parent
7e01bc967d
commit
c0540ffda9
@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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@ -1106,70 +1106,87 @@ void ThreadsSMRSupport::print_info_on(const Thread* thread, outputStream* st) {
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// Print Threads class SMR info.
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void ThreadsSMRSupport::print_info_on(outputStream* st) {
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// Only grab the Threads_lock if we don't already own it and if we
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// are not reporting an error.
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// Note: Not grabbing the Threads_lock during error reporting is
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// dangerous because the data structures we want to print can be
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// freed concurrently. However, grabbing the Threads_lock during
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// error reporting can be equally dangerous since this thread might
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// block during error reporting or a nested error could leave the
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// Threads_lock held. The classic no win scenario.
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//
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MutexLocker ml((Threads_lock->owned_by_self() || VMError::is_error_reported()) ? NULL : Threads_lock);
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bool needs_unlock = false;
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if (Threads_lock->try_lock()) {
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// We were able to grab the Threads_lock which makes things safe for
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// this call, but if we are error reporting, then a nested error
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// could happen with the Threads_lock held.
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needs_unlock = true;
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}
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st->print_cr("Threads class SMR info:");
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st->print_cr("_java_thread_list=" INTPTR_FORMAT ", length=%u, "
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"elements={", p2i(_java_thread_list),
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_java_thread_list->length());
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print_info_elements_on(st, _java_thread_list);
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st->print_cr("}");
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if (_to_delete_list != NULL) {
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st->print_cr("_to_delete_list=" INTPTR_FORMAT ", length=%u, "
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"elements={", p2i(_to_delete_list),
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_to_delete_list->length());
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print_info_elements_on(st, _to_delete_list);
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ThreadsList* saved_threads_list = NULL;
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{
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ThreadsListHandle tlh; // make the current ThreadsList safe for reporting
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saved_threads_list = tlh.list(); // save for later comparison
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st->print_cr("Threads class SMR info:");
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st->print_cr("_java_thread_list=" INTPTR_FORMAT ", length=%u, elements={",
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p2i(saved_threads_list), saved_threads_list->length());
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print_info_elements_on(st, saved_threads_list);
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st->print_cr("}");
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for (ThreadsList *t_list = _to_delete_list->next_list();
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t_list != NULL; t_list = t_list->next_list()) {
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st->print("next-> " INTPTR_FORMAT ", length=%u, "
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"elements={", p2i(t_list), t_list->length());
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print_info_elements_on(st, t_list);
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}
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if (_to_delete_list != NULL) {
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if (Threads_lock->owned_by_self()) {
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// Only safe if we have the Threads_lock.
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st->print_cr("_to_delete_list=" INTPTR_FORMAT ", length=%u, elements={",
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p2i(_to_delete_list), _to_delete_list->length());
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print_info_elements_on(st, _to_delete_list);
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st->print_cr("}");
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for (ThreadsList *t_list = _to_delete_list->next_list();
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t_list != NULL; t_list = t_list->next_list()) {
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st->print("next-> " INTPTR_FORMAT ", length=%u, elements={",
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p2i(t_list), t_list->length());
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print_info_elements_on(st, t_list);
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st->print_cr("}");
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}
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} else {
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st->print_cr("_to_delete_list=" INTPTR_FORMAT, p2i(_to_delete_list));
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st->print_cr("Skipping _to_delete_list fields and contents for safety.");
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}
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}
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if (!EnableThreadSMRStatistics) {
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return;
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if (EnableThreadSMRStatistics) {
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st->print_cr("_java_thread_list_alloc_cnt=" UINT64_FORMAT ", "
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"_java_thread_list_free_cnt=" UINT64_FORMAT ", "
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"_java_thread_list_max=%u, "
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"_nested_thread_list_max=%u",
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_java_thread_list_alloc_cnt,
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_java_thread_list_free_cnt,
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_java_thread_list_max,
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_nested_thread_list_max);
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if (_tlh_cnt > 0) {
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st->print_cr("_tlh_cnt=%u"
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", _tlh_times=%u"
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", avg_tlh_time=%0.2f"
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", _tlh_time_max=%u",
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_tlh_cnt, _tlh_times,
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((double) _tlh_times / _tlh_cnt),
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_tlh_time_max);
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}
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if (_deleted_thread_cnt > 0) {
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st->print_cr("_deleted_thread_cnt=%u"
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", _deleted_thread_times=%u"
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", avg_deleted_thread_time=%0.2f"
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", _deleted_thread_time_max=%u",
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_deleted_thread_cnt, _deleted_thread_times,
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((double) _deleted_thread_times / _deleted_thread_cnt),
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_deleted_thread_time_max);
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}
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st->print_cr("_delete_lock_wait_cnt=%u, _delete_lock_wait_max=%u",
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_delete_lock_wait_cnt, _delete_lock_wait_max);
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st->print_cr("_to_delete_list_cnt=%u, _to_delete_list_max=%u",
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_to_delete_list_cnt, _to_delete_list_max);
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}
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st->print_cr("_java_thread_list_alloc_cnt=" UINT64_FORMAT ", "
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"_java_thread_list_free_cnt=" UINT64_FORMAT ", "
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"_java_thread_list_max=%u, "
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"_nested_thread_list_max=%u",
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_java_thread_list_alloc_cnt,
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_java_thread_list_free_cnt,
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_java_thread_list_max,
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_nested_thread_list_max);
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if (_tlh_cnt > 0) {
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st->print_cr("_tlh_cnt=%u"
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", _tlh_times=%u"
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", avg_tlh_time=%0.2f"
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", _tlh_time_max=%u",
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_tlh_cnt, _tlh_times,
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((double) _tlh_times / _tlh_cnt),
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_tlh_time_max);
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if (needs_unlock) {
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Threads_lock->unlock();
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} else {
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if (_java_thread_list != saved_threads_list) {
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st->print_cr("The _java_thread_list has changed from " INTPTR_FORMAT
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" to " INTPTR_FORMAT
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" so some of the above information may be stale.",
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p2i(saved_threads_list), p2i(_java_thread_list));
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}
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}
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if (_deleted_thread_cnt > 0) {
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st->print_cr("_deleted_thread_cnt=%u"
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", _deleted_thread_times=%u"
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", avg_deleted_thread_time=%0.2f"
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", _deleted_thread_time_max=%u",
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_deleted_thread_cnt, _deleted_thread_times,
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((double) _deleted_thread_times / _deleted_thread_cnt),
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_deleted_thread_time_max);
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}
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st->print_cr("_delete_lock_wait_cnt=%u, _delete_lock_wait_max=%u",
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_delete_lock_wait_cnt, _delete_lock_wait_max);
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st->print_cr("_to_delete_list_cnt=%u, _to_delete_list_max=%u",
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_to_delete_list_cnt, _to_delete_list_max);
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}
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// Print ThreadsList elements (4 per line).
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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@ -93,8 +93,10 @@ public class NestedThreadsListHandleInErrorHandlingTest {
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Pattern.compile("Current thread .* _threads_hazard_ptr=0x[0-9A-Fa-f][0-9A-Fa-f]*, _nested_threads_hazard_ptr_cnt=1, _nested_threads_hazard_ptr=0x[0-9A-Fa-f][0-9A-Fa-f]*.*"),
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// We should have a section of Threads class SMR info:
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Pattern.compile("Threads class SMR info:"),
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// We should have one nested ThreadsListHandle:
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Pattern.compile(".*, _nested_thread_list_max=1"),
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// We should have had a double nested ThreadsListHandle since
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// ThreadsSMRSupport::print_info_on() now protects itself with
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// a ThreadsListHandle in addition to what the test creates:
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Pattern.compile(".*, _nested_thread_list_max=2"),
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// The current thread (marked with '=>') in the threads list
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// should show a hazard ptr and a nested hazard ptr:
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Pattern.compile("=>.* JavaThread \"main\" .* _threads_hazard_ptr=0x[0-9A-Fa-f][0-9A-Fa-f]*, _nested_threads_hazard_ptr_cnt=1, _nested_threads_hazard_ptr=0x[0-9A-Fa-f][0-9A-Fa-f]*.*"),
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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@ -93,6 +93,10 @@ public class ThreadsListHandleInErrorHandlingTest {
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Pattern.compile("Current thread .* _threads_hazard_ptr=0x[0-9A-Fa-f][0-9A-Fa-f]*, _nested_threads_hazard_ptr_cnt=0.*"),
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// We should have a section of Threads class SMR info:
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Pattern.compile("Threads class SMR info:"),
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// We should have had a single nested ThreadsListHandle since
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// ThreadsSMRSupport::print_info_on() now protects itself with
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// a ThreadsListHandle:
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Pattern.compile(".*, _nested_thread_list_max=1"),
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// The current thread (marked with '=>') in the threads list
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// should show a hazard ptr and no nested hazard ptrs:
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Pattern.compile("=>.* JavaThread \"main\" .* _threads_hazard_ptr=0x[0-9A-Fa-f][0-9A-Fa-f]*, _nested_threads_hazard_ptr_cnt=0.*"),
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