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Posted to commits@harmony.apache.org by "Ivan Volosyuk (JIRA)" <ji...@apache.org> on 2006/12/27 20:44:28 UTC
[jira] Updated: (HARMONY-2907) [drlvm][gc] re-enabling of pinning
in gcv4.1
[ http://issues.apache.org/jira/browse/HARMONY-2907?page=all ]
Ivan Volosyuk updated HARMONY-2907:
-----------------------------------
Attachment: h2907_pinning.diff
Patch attached.
> [drlvm][gc] re-enabling of pinning in gcv4.1
> --------------------------------------------
>
> Key: HARMONY-2907
> URL: http://issues.apache.org/jira/browse/HARMONY-2907
> Project: Harmony
> Issue Type: Improvement
> Components: DRLVM
> Environment: All
> Reporter: Ivan Volosyuk
> Priority: Minor
> Attachments: h2907_pinning.diff
>
>
> Disabling of pinning of heap objects had negative performance impact for some work loads, like xml processing.
> Here is a patch to enable pinning again.
> Pinning support improved:
> * added handling for pin counter overflow.
> * hashcode status bits and pin counter has placed in different bytes of object status word to prevent any possibility of conflict
> * pin counter updates are atomic while hashcode status updates are not.
> I have tested the code on following scenarios:
> Live object is pinned in different threads and overflow pin counter
> Objects are created and pinned in endless loop
> Smoke tests
> EM64T
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