Hi all,
Could you review and sponsor it?
http://cr.openjdk.java.net/~ysuenaga/JDK-8151815/webrev.01/
If it is not accepted, I think that we can add new field to PerfMemory for
using in JSnap:
-----------------------
diff -r 4823056a5bbd src/share/vm/runtime/perfMemory.cpp
--- a/src/share/vm/runtime/perfMemory.cpp Tue Apr 12 09:08:48 2016 +0000
+++ b/src/share/vm/runtime/perfMemory.cpp Wed Apr 13 14:18:15 2016 +0900
@@ -45,11 +45,16 @@
UINT_CHARS + 1;
char* PerfMemory::_start = NULL;
+char* PerfMemory::_saved_start = NULL;
char* PerfMemory::_end = NULL;
+char* PerfMemory::_saved_end = NULL;
char* PerfMemory::_top = NULL;
+char* PerfMemory::_saved_top = NULL;
size_t PerfMemory::_capacity = 0;
+size_t PerfMemory::_saved_capacity = 0;
jint PerfMemory::_initialized = false;
PerfDataPrologue* PerfMemory::_prologue = NULL;
+PerfDataPrologue* PerfMemory::_saved_prologue = NULL;
void perfMemory_init() {
@@ -103,6 +108,8 @@
// allocate PerfData memory region
create_memory_region(capacity);
+ _saved_start = _start;
+ _saved_capacity = _capacity;
if (_start == NULL) {
@@ -132,8 +139,11 @@
}
_prologue = (PerfDataPrologue *)_start;
+ _saved_prologue = _prologue;
_end = _start + _capacity;
+ _saved_end = _end;
_top = _start + sizeof(PerfDataPrologue);
+ _saved_top = _top;
}
assert(_prologue != NULL, "prologue pointer must be initialized");
-----------------------
If it is better, I will upload a webrev.
Thanks,
Yasumasa
On 2016/04/06 12:42, Yasumasa Suenaga wrote:
Hi Dmitry,
Thanks for your comment.
I uploaded a new webrev. Could you review again?
http://cr.openjdk.java.net/~ysuenaga/JDK-8151815/webrev.01/
On 2016/04/06 0:31, Dmitry Samersoff wrote:
Yasumasa,
1. It's better to change JSnap code to produce meaningful error message
instead of NPE.
I added null check and set message to PerfMemory.java .
2. We should check that no other consumer of perf counters rely on the
fact it's NULL after call to destroy(). I'm not sure that this part of
the fix is not dangerous.
I added new flag (_destroyed) in PerfMemory class.
This flag set true at PerfMemory::destroy().
_start, _end, and more field which I removed from destroy() are private member
of
PerfMemory. I implemented that the getter functions of them check _destroyed
flag,
and returns same value before this change.
So I think this change does not affect other place.
Thanks,
Yasumasa
-Dmitry
On 2016-03-29 15:02, Yasumasa Suenaga wrote:
PING: Could you review it?
Yasumasa
On 2016/03/22 21:24, Yasumasa Suenaga wrote:
PING: Could you review it?
Yasumasa
2016/03/14 23:39 "Yasumasa Suenaga" <yasue...@gmail.com
<mailto:yasue...@gmail.com>>:
Hi all,
When I use `jhsdb jsnap` to get PerfCounter from core images, I
encountered NPE:
-------------
Exception in thread "main" java.lang.NullPointerException
at sun.jvm.hotspot.tools.JSnap.run(JSnap.java:45)
at sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:223)
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at sun.jvm.hotspot.tools.JSnap.main(JSnap.java:67)
at sun.jvm.hotspot.SALauncher.runJSNAP(SALauncher.java:352)
at sun.jvm.hotspot.SALauncher.main(SALauncher.java:404)
-------------
PerfMemory::destroy() clears all members which are used in JSnap.
Thus NPE is occurred.
I uploaded webrev for this issue.
Could you review it?
http://cr.openjdk.java.net/~ysuenaga/JDK-8151815/webrev.00/
I cannot access JPRT.
So I need a Sponsor.
Thanks,
Yasumasa
