1 /*

     2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 #include "precompiled.hpp"

    26 #include "jfr/recorder/jfrEventSetting.inline.hpp"

    27 #include "jfr/recorder/storage/jfrStorage.hpp"

    28 #include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"

    29 #include "jfr/support/jfrFlush.hpp"

    30 #include "jfr/support/jfrThreadLocal.hpp"

    31 #include "runtime/thread.inline.hpp"

    32 #include "utilities/debug.hpp"

    33 

    34 JfrFlush::JfrFlush(JfrStorage::Buffer* old, size_t used, size_t requested, Thread* t) :

    35   _result(JfrStorage::flush(old, used, requested, true, t)) {

    36 }

    37 

    38 template <typename T>

    39 class LessThanHalfBufferSize : AllStatic {

    40 public:

    41   static bool evaluate(T* t) {

    42     assert(t != NULL, "invariant");

    43     return t->free_size() < t->size() / 2;

    44   }

    45 };

    46 

    47 template <typename T>

    48 class LessThanSize : AllStatic {

    49  public:

    50   static bool evaluate(T* t, size_t size) {

    51     assert(t != NULL, "invariant");

    52     return t->free_size() < size;

    53   }

    54 };

    55 

    56 bool jfr_is_event_enabled(JfrEventId id) {

    57   return JfrEventSetting::is_enabled(id);

    58 }

    59 

    60 bool jfr_has_stacktrace_enabled(JfrEventId id) {

    61   return JfrEventSetting::has_stacktrace(id);

    62 }

    63 

    64 void jfr_conditional_flush(JfrEventId id, size_t size, Thread* t) {

    65   assert(jfr_is_event_enabled(id), "invariant");

    66   if (t->jfr_thread_local()->has_native_buffer()) {

    67     JfrStorage::Buffer* const buffer = t->jfr_thread_local()->native_buffer();

    68     if (LessThanSize<JfrStorage::Buffer>::evaluate(buffer, size)) {

    69       JfrFlush f(buffer, 0, 0, t);

    70     }

    71   }

    72 }

    73 

    74 bool jfr_save_stacktrace(Thread* t) {

    75   JfrThreadLocal* const tl = t->jfr_thread_local();

    76   if (tl->has_cached_stack_trace()) {

    77     return false; // no ownership

    78   }

    79   tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(t));

    80   return true;

    81 }

    82 

    83 void jfr_clear_stacktrace(Thread* t) {

    84   t->jfr_thread_local()->clear_cached_stack_trace();

    85 }