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<div class="moz-cite-prefix">John<br>
<br>
This test should start failing in non-G1 baseline. Even
"IgnoreUnrecognizedVMOptions" is added I think it should fail
because of incompatible GC combinations.<br>
<br>
Also I think that investigation parent process from child is not
safe and make analysis harder if something going wrong. <br>
<br>
Also there was a bug 15947151 - JDK6 JMAP -HEAP LOCKS post 6u29.
<br>
Here are comments from Kevin: <br>
<br>
<tt style="background-color: rgb(255, 255, 255);"><i>@ Using
Runtime.exec to launch a child process which then attaches
back to the</i> <br>
<i>@ parent to run diagnostics just sounds risky. Diagnostics
may need to suspend</i> <br>
<i>@ the parent JVM. The child needs the parent to read buffers
such that the </i><br>
<i>@ child may write. Buffering usually lets this succeed, but
there could</i> <br>
<i>@ be some risk.</i> </tt><br>
<br>
<br>
So I would prefer to avoid such schemes if we don't want to test
them. <br>
<br>
Leonid<br>
<br>
On 02/14/2013 04:51 AM, John Cuthbertson wrote:<br>
</div>
<blockquote cite="mid:511C352F.5030606@oracle.com" type="cite">Hi
Everyone,
<br>
<br>
Can I have a couple of volunteers review the regression test for
8005875 - the webrev can be found at:
<a class="moz-txt-link-freetext" href="http://cr.openjdk.java.net/~johnc/8008188/webrev.0/">http://cr.openjdk.java.net/~johnc/8008188/webrev.0/</a>
<br>
<br>
The test is very simple and issues "jcmd <pid> Thread.print"
against itself. With G1 and PGCT=0, and before the fix for
8005875, this command crashes the VM.
<br>
<br>
Testing:
<br>
jdk8 build (b76) with fix for 8005875; jdk8 build (b71) without
fix for 8005875; Changed the test options to run the test with the
invalid flag -XX:+UseG2GC.
<br>
<br>
Thanks,
<br>
<br>
JohnC
<br>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Leonid Mesnik
JVM SQE</pre>
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