>From the document, i see Space reclamation phase (multiple mixed collections) is when the object from old gen is collected. So shouldn't we get notified via OldGen GarbageCollectorMXBean instead of YoungGen MXBean?
I am still trying to understand if this was designed to be like this because of logical space/generation in G1GC or it is a bug? Thanks Sundar On Wed, Jul 19, 2017 at 12:09 PM, Jenny Zhang <yu.zh...@oracle.com> wrote: > Sundar, > > Initial mark is a young gc piggy backed with some initial marking > activities. > > "Initial Mark : This type of collection starts the marking process in > addition to performing a regular young-only collection. Concurrent marking > determines all currently reachable (live) objects in the old generation > regions to be kept for the following space-reclamation phase. While marking > hasn’t completely finished, regular young collections may occur. Marking > finishes with two special stop-the-world pauses: Remark and Cleanup." > > From http://docs.oracle.com/javase/9/gctuning/garbage-first- > garbage-collector.htm#JSGCT-GUID-1CDEB6B6-9463-4998-815D-05E095BFBD0F > > Thanks > > Jenny > > On 7/19/2017 11:03 AM, Sundara Mohan M wrote: > > Jenny, > Thanks for the update. > > Another question i was looking at the source and saw this, > > enum G1YCType { > Normal, > InitialMark, > DuringMark, > Mixed, > G1YCTypeEndSentinel > }; > > > Any idea why InitialMark are categorized as Young Collection, though it is > processing in Old Generation? > Also mixed can include old regions in which case it should be categorized > as Old Generation. > > Just trying to understand if this is designed like this or this is kind of > bug? > > > Thanks, > Sundar > > On Wed, Jul 19, 2017 at 8:24 AM, yu.zh...@oracle.com <yu.zh...@oracle.com> > wrote: > >> Sundara, >> >> I have filed this bug https://bugs.openjdk.java.net/browse/JDK-8145923 >> >> But has not been fixed. >> >> Jenny >> >> On 07/18/2017 10:41 AM, Sundara Mohan M wrote: >> >> Hi, >> I am trying to capture all GC event happened on G1 Old Generation. >> I was expecting when G1 Evacuation pause (mixed) happens it should >> trigger event to my app but instead, i am getting notification only when >> Full GC happens. >> >> Here is what i am doing >> >> gcMxBeanListener = myFunction(...) >> oldGen = ManagementFactiory.getGarbageCollectorMXBeans find { "G1 Old >> Generation" } >> oldGen.addNotificationListener(gcMxBeanListener, null, null) >> >> But in the case of CMS GC, it is triggered when the concurrent cycle is >> completed. >> >> >> Is there something i am missing? >> >> Thanks, >> Sundar >> >> >> _______________________________________________ >> hotspot-gc-use mailing >> listhotspot-gc-...@openjdk.java.nethttp://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use >> >> >> > >
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