Hi Serguei,
Maybe resolve code duplication in post_compiled_method_load(nmethod *nm)
and post_compiled_method_load(JvmtiEnv* env, nmethod *nm)?
Looks like the only difference is logging, but I don't think it's
important as old post_compiled_method_load(JvmtiEnv* env, const
jmethodID method, const jint length, ...) was not used.
--alex
On 04/09/2019 13:58, [email protected] wrote:
Hi Jc,
Thank you a lot for looking at this!
On 4/9/19 9:29 AM, Jean Christophe Beyler wrote:
Hi Serguei,
I saw a nit here:
http://cr.openjdk.java.net/~sspitsyn/webrevs/2019/8222072-jvmti-GenerateEvents.1/test/hotspot/jtreg/serviceability/jvmti/GenerateEvents/MyPackage/GenerateEventsTest.java.html
<http://cr.openjdk.java.net/%7Esspitsyn/webrevs/2019/8222072-jvmti-GenerateEvents.1/test/hotspot/jtreg/serviceability/jvmti/GenerateEvents/MyPackage/GenerateEventsTest.java.html>
arei -> are
Nice catch, fixed.
- I'm not sure you needed two files for the agents, you could have
re-used some of the code and just called twice GetEnv but that is a
detail.
Right.
I initially wanted to use this way but then decided to use two real
agent libraries.
Wanted to exercise this path.
- I thought JNIEnv was not supposed to be really kept because it
should not be used by another thread, is there not a risk that you are
doing that? It doesn't look like it but I've been surprised in the past
You are right.
Tried to fix it in new webrev version below.
- Isn't there a chance that your second agent gets a normal
JVMTI_EVENT_COMPILED_METHOD_LOAD before the GenerateEvents call and
increments its counter?
- I guess we'd see if it becomes flaky at some point? :)
Yes, it is expected.
But they should be posted on threads other than Main thread.
The callback should ignore them.
The updated fix version is:
http://cr.openjdk.java.net/~sspitsyn/webrevs/2019/8222072-jvmti-GenerateEvents.2/
Thanks!
Serguei
Thanks!
Jc
On Mon, Apr 8, 2019 at 12:29 PM [email protected]
<mailto:[email protected]> <[email protected]
<mailto:[email protected]>> wrote:
Please, review a fix for:
https://bugs.openjdk.java.net/browse/JDK-8222072
Webrev:
http://cr.openjdk.java.net/~sspitsyn/webrevs/2019/8222072-jvmti-GenerateEvents.1/
<http://cr.openjdk.java.net/%7Esspitsyn/webrevs/2019/8222072-jvmti-GenerateEvents.1/>
Summary:
The JVMTI GenerateEvents() must send CompiledMethodLoad events
only to the agent which called it.
However, it sends events to all agents (jvmti environements)
which violates the JVMTI spec.
The webrev above fixes this issue and adds new jtreg test:
test/hotspot/jtreg/serviceability/jvmti/GenerateEvents
Testing:
Mach5 submission for:
- JVMTI tests: open/test/hotspot/jtreg/vmTestbase/nsk/jvmti
- new test: test/hotspot/jtreg/serviceability/jvmti/GenerateEvents
Thanks,
Serguei
--
Thanks,
Jc
