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 "jfr/leakprofiler/checkpoint/eventEmitter.hpp"
26 #include "jfr/leakprofiler/leakProfiler.hpp"
27 #include "jfr/leakprofiler/sampling/objectSampler.hpp"
28 #include "jfr/leakprofiler/startOperation.hpp"
29 #include "jfr/leakprofiler/stopOperation.hpp"
30 #include "jfr/recorder/service/jfrOptionSet.hpp"
31 #include "logging/log.hpp"
32 #include "memory/iterator.hpp"
33 #include "runtime/javaThread.inline.hpp"
34 #include "runtime/vmThread.hpp"
35
36 bool LeakProfiler::is_supported() {
37 if (UseShenandoahGC || UseZGC) {
38 // Leak Profiler uses mark words in the ways that might interfere
39 // with concurrent GC uses of them. This affects Shenandoah.
40 //
41 // Generational ZGC only does weak reference processing in the old generation.
42 // All objects that would usually die, because we are sampling stuff
43 // that immediately becomes garbage, will be artificially kept alive
44 // until an old-generation collection. This incurs a significant
45 // performance hit by causing allocation stalls.
46 return false;
47 }
48 return true;
49 }
50
51 bool LeakProfiler::is_running() {
52 return ObjectSampler::is_created();
53 }
54
55 bool LeakProfiler::start(int sample_count) {
56 if (is_running()) {
57 return true;
58 }
59
60 // Allows user to disable leak profiler on command line by setting queue size to zero.
61 if (sample_count == 0) {
62 return false;
63 }
64
65 // Exit cleanly if not supported
|
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 "jfr/leakprofiler/checkpoint/eventEmitter.hpp"
26 #include "jfr/leakprofiler/leakProfiler.hpp"
27 #include "jfr/leakprofiler/sampling/objectSampler.hpp"
28 #include "jfr/leakprofiler/startOperation.hpp"
29 #include "jfr/leakprofiler/stopOperation.hpp"
30 #include "jfr/recorder/service/jfrOptionSet.hpp"
31 #include "logging/log.hpp"
32 #include "memory/iterator.hpp"
33 #include "runtime/javaThread.inline.hpp"
34 #include "runtime/vmThread.hpp"
35
36 bool LeakProfiler::is_supported() {
37 if (UseCompactObjectHeaders || UseShenandoahGC || UseZGC) {
38 // 1. With a 32-bit mark word in Lilliput2, we don't have enough unused
39 // bits to store edge index information in the mark word
40 // 2. Even without compressed object headers, with Shenandoah, we don't
41 // have enough free bits in the mark word because of needing that
42 // space for forwarding pointers in the evacuation & update refs phase.
43 // 3. Generational ZGC only does weak reference processing in the old generation.
44 // All objects that would usually die, because we are sampling stuff
45 // that immediately becomes garbage, will be artificially kept alive
46 // until an old-generation collection. This incurs a significant
47 // performance hit by causing allocation stalls.
48 return false;
49 }
50 return true;
51 }
52
53 bool LeakProfiler::is_running() {
54 return ObjectSampler::is_created();
55 }
56
57 bool LeakProfiler::start(int sample_count) {
58 if (is_running()) {
59 return true;
60 }
61
62 // Allows user to disable leak profiler on command line by setting queue size to zero.
63 if (sample_count == 0) {
64 return false;
65 }
66
67 // Exit cleanly if not supported
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