Entry function of GC Collection
abhijangda at hotmail.com
Thu Jul 30 03:10:41 UTC 2015
Yes, I was looking for these methods. Thanks a lot for all of you.
I did some more digging and found out that The type of generation in Serial GC is TenuredGeneration. Now, TenuredGeneration::collect () calls OneContigSpaceCardGeneration::collect (). But in OneContigSpaceCardGeneration::collect () I couldn't see any code related to collect or relevant to collect. Please tell me if collection is happening somewhere else or here? If somewhere else then where?
I can see that TenuredGeneration::collect () is called from _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); in GenCollectedHeap::do_collection () function in file genCollectedHeap.cpp.
Date: Mon, 27 Jul 2015 11:28:46 -0700
From: jon.masamitsu at oracle.com
To: hotspot-gc-dev at openjdk.java.net
Subject: Re: Entry function of GC Collection
You're perhaps looking for the collect() methods.
On 07/25/2015 01:30 PM, Abhinav Jangda
I have been working on a project which requires me to change GC
Algorithm in Java Hotspot VM. I have been trying to understand
the source code of GC in Hotspot VM. I know a couple of details
about GC in Hotspot now. But I am not able to find the start
function of GC Collection. I think VM_GenCollectFull::doit
and VM_GenCollectForAllocation::doit() are the two
functions called for GC. But if I add std::cout
statements at the start of these functions and start the Dacapo
Benchmarks I couldn't see any result produced by std::cout
statements. I want to work with SerialGC.
Here is the command I used to run Hotspot:
./java -XX:+UseSerialGC -jar dacapo.jar jython
OpenJDK version is 8 and I am compiling building openjdk using
It will be great if anyone of you could help me.
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