WIP:RamClass: Segment allocation enhancements #20896
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tajila
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Jan 9, 2025
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runtime/vm/createramclass.cpp
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| @@ -2997,17 +3017,18 @@ internalCreateRAMClassFromROMClassImpl(J9VMThread *vmThread, J9ClassLoader *clas | |||
| allocationRequests[RAM_CLASS_FLATTENED_CLASS_CACHE].alignment = OMR_MAX(sizeof(J9Class *), sizeof(UDATA)); | |||
| allocationRequests[RAM_CLASS_FLATTENED_CLASS_CACHE].alignedSize = flattenedClassCacheAllocSize; | |||
| allocationRequests[RAM_CLASS_FLATTENED_CLASS_CACHE].address = NULL; | |||
| allocationRequests[RAM_CLASS_FLATTENED_CLASS_CACHE].segmentKind = SUB4G; | |||
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The changes reflect the feature request eclipse-openj9#20644. Adding segment categories for RAMClass fragments: sub4G Frequently accessed Infrequently accessed Closes: eclipse-openj9#20644 Signed-off-by: Nick Kamal <[email protected]>
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h3110n3rv3
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Jan 30, 2025
| @@ -2925,67 +2934,78 @@ internalCreateRAMClassFromROMClassImpl(J9VMThread *vmThread, J9ClassLoader *clas | |||
| } | |||
| allocationRequests[RAM_SUPERCLASSES_FRAGMENT].alignedSize = OMR_MAX(superclassSizeBytes, minimumSuperclassArraySizeBytes); | |||
| allocationRequests[RAM_SUPERCLASSES_FRAGMENT].address = NULL; | |||
| allocationRequests[RAM_SUPERCLASSES_FRAGMENT].segmentKind = SUB4G; | |||
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if I don't put the shared class fragments in sub4g then these extended.openjdk tests fail: SharedClasses.SCM01.MultiThread_1,SharedClasses.SCM23.MultiThread_1
h3110n3rv3
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Jan 30, 2025
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| /* Add sizeof(UDATA) to hold the "lastAllocatedClass" pointer */ | ||
| newSegmentSize += sizeof(UDATA); | ||
| if(!isNotLoadedByAnonClassLoader) |
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i have been trying to figure out how to deal with anonymous class fragments but I am stuck.
There is comment in cleanUpSegmentsInAnonymousClassLoader function that /* Anonymous classes expected to be allocated one per segment */. That function causes segfault without this code for one of the sanity.perf tests
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all jenkins tests passing for the current shelve |
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@gacholio Please take a look |
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Has there been any testing or performance analysis on this? |
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jenkins compile xlinux jdk17,jdk11 |
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The changes reflect the feature request #20644.
Adding segment categories for RAMClass fragments:
sub4G
Frequently accessed
Infrequently accessed
Closes: #20644
Signed-off-by: Nick Kamal <[email protected]>