Happy path

[Roman Kennke]

Yes, indeed. Matrix barriers need to be always on.
Roman

Am 14. Februar 2018 13:06:56 MEZ schrieb Aleksey Shipilev <shade at redhat.com>:
>On 02/14/2018 12:01 PM, Aleksey Shipilev wrote:
>> On 02/14/2018 11:03 AM, Roland Westrelin wrote:
>>> http://cr.openjdk.java.net/~roland/shenandoah/happypath/webrev.00/
>> 
>> This looks very promising!
>
>hotspot_gc_shenandoah fails tests when partial heuristics are enabled.
>That must mean we cannot skip
>matrix update pre-barrier when GC state is 0 -- it should be active
>even when heap is stable?
>
>See:
>
>$ CONF=linux-x86_64-normal-server-fastdebug make images run-test
>TEST=gc/stress/gcbasher/TestGCBasherWithShenandoah.java
>...
>[0.857s][info][gc,start     ] GC(0) Pause Init Partial
>[0.862s][info][gc,start     ] GC(0) Verify Before Partial, Level 4
># To suppress the following error report, specify this argument
># after -XX: or in .hotspotrc: 
>SuppressErrorAt=/shenandoahVerifier.cpp:56
>#
># A fatal error has been detected by the Java Runtime Environment:
>#
>#  Internal Error
>(/home/shade/trunks/shenandoah-jdk10/src/hotspot/share/gc/shenandoah/shenandoahVerifier.cpp:56),
>pid=60634, tid=60638
>#  Error: Before Partial, Reachable: Must be connected
>
>Referenced from:
>  interior location: 0x00000000c57cf3f4
>0x00000000c57cf3c0 - klass 0x000000010007ed88
>java.nio.DirectByteBufferR
>        allocated after complete mark start
>        allocated after next mark start
>        marked complete
>        marked next
>    not in collection set
>region: |0x0000153af407eba0|  175|R  |BTE 0x00000000c5780000,
>0x00000000c5800000,
>0x00000000c5800000|U 100%|T 100%|G   0%|S   0%|L 100%|FTS           
>1474|LTS            1481| |CP
>0|TAMS 0x00000000c5780000, 0x00000000c5780000|
>
>Object:
>0x00000000c01fc6c8 - klass 0x000000010007ed88
>java.nio.DirectByteBufferR
>        allocated after complete mark start
>        allocated after next mark start
>        marked complete
>        marked next
>    not in collection set
>region: |0x0000153af406e9a0|    3|R  |BTE 0x00000000c0180000,
>0x00000000c0200000,
>0x00000000c0200000|U 100%|T 100%|G   0%|S   0%|L 100%|FTS             
>24|LTS              31| |CP
>0|TAMS 0x00000000c0180000, 0x00000000c0180000|
>
>Forwardee:
>  (the object itself)Matrix connections:
>                 reference and object not connected
>            fwd(reference) and object not connected
>            reference and fwd(object) not connected
>       fwd(reference) and fwd(object) not connected
>        interior-reference and object not connected
>   interior-reference and fwd(object) not connected
>
>
>-Aleksey

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