Do not add Own.Sync. object to the list if scan wasn't successfull #20589
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amicic
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Nov 13, 2024
If Ownable Synchronizer object scan has not been successful (caused Copy Forward abort) it should not be aadded to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. Relates eclipse-openj9#20395 Signed-off-by: Dmitri Pivkine <[email protected]>
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amicic
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Nov 13, 2024
This was referenced May 6, 2025
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If Ownable Synchronizer object scan has not been successful (caused Copy Forward Abort) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with PACKET reason and failed during the scan. It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan. Signed-off-by: Aleksandar Micic <[email protected]>
amicic
pushed a commit
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May 20, 2025
If Ownable Synchronizer object scan (regardless if for PACKET or COPY reason) has not been successful (caused Copy Forward Abort, when a child object fails to copy) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. The existing logic is incorrect for the case when the original scan reason was PACKET (object still a part of Collection Set) and failed to scan - the object would be added twice (both on the first and the second scan isObjectInEvacuateMemoryNoCheck condition would be true). This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with COPY reason and failed during the scan - the object would neither be added on the first scan due to failed scanning nor be added on the second scan due to not being a part of CS (it's copied, in survivor memory). It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan. Signed-off-by: Aleksandar Micic <[email protected]>
amicic
pushed a commit
to amicic/openj9
that referenced
this pull request
May 20, 2025
If Ownable Synchronizer object scan (regardless if for PACKET or COPY reason) has not been successful (caused Copy Forward Abort, when a child object fails to copy) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. The existing logic is incorrect for the case when the original scan reason was PACKET (object still a part of Collection Set) and failed to scan - the object would be added twice (both on the first and the second scan isObjectInEvacuateMemoryNoCheck condition would be true). This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with COPY reason and failed during the scan - the object would neither be added on the first scan due to failed scanning nor be added on the second scan due to not being a part of CS (it's copied, in survivor memory). It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan. Signed-off-by: Aleksandar Micic <[email protected]>
amicic
pushed a commit
to amicic/openj9
that referenced
this pull request
May 20, 2025
If Ownable Synchronizer object scan (regardless if for PACKET or COPY reason) has not been successful (caused Copy Forward Abort, when a child object fails to copy) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. The existing logic is incorrect for the case when the original scan reason was PACKET (object still a part of Collection Set) and failed to scan - the object would be added twice (both on the first and the second scan isObjectInEvacuateMemoryNoCheck condition would be true). This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with COPY reason and failed during the scan - the object would neither be added on the first scan due to failed scanning nor be added on the second scan due to not being a part of CS (it's copied, in survivor memory). It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan. Signed-off-by: Aleksandar Micic <[email protected]>
amicic
pushed a commit
to amicic/openj9
that referenced
this pull request
May 20, 2025
If Ownable Synchronizer object scan (regardless if for PACKET or COPY reason) has not been successful (caused Copy Forward Abort, when a child object fails to copy) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. The existing logic is incorrect for the case when the original scan reason was PACKET (object still a part of Collection Set) and failed to scan - the object would be added twice (both on the first and the second scan isObjectInEvacuateMemoryNoCheck condition would be true). This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with COPY reason and failed during the scan - the object would neither be added on the first scan due to failed scanning nor be added on the second scan due to not being a part of CS (it's copied, in survivor memory). It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan. Signed-off-by: Aleksandar Micic <[email protected]>
amicic
pushed a commit
to amicic/openj9
that referenced
this pull request
May 20, 2025
If Ownable Synchronizer object scan (regardless if for PACKET or COPY reason) has not been successful (caused Copy Forward Abort, when a child object fails to copy) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. The existing logic is incorrect for the case when the original scan reason was PACKET (object still a part of Collection Set) and failed to scan - the object would be added twice (both on the first and the second scan isObjectInEvacuateMemoryNoCheck condition would be true). This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with COPY reason and failed during the scan - the object would neither be added on the first scan due to failed scanning nor be added on the second scan due to not being a part of CS (it's copied, in survivor memory). It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan. Signed-off-by: Aleksandar Micic <[email protected]>
amicic
pushed a commit
to amicic/openj9
that referenced
this pull request
May 20, 2025
If Ownable Synchronizer object scan (regardless if for PACKET or COPY reason) has not been successful (caused Copy Forward Abort, when a child object fails to copy) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. The existing logic is incorrect for the case when the original scan reason was PACKET (object still a part of Collection Set) and failed to scan - the object would be added twice (both on the first and the second scan isObjectInEvacuateMemoryNoCheck condition would be true). This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with COPY reason and failed during the scan - the object would neither be added on the first scan due to failed scanning nor be added on the second scan due to not being a part of CS (it's copied, in survivor memory). It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan. Signed-off-by: Aleksandar Micic <[email protected]>
amicic
pushed a commit
to amicic/openj9
that referenced
this pull request
May 20, 2025
If Ownable Synchronizer object scan (regardless if for PACKET or COPY reason) has not been successful (caused Copy Forward Abort, when a child object fails to copy) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. The existing logic is incorrect for the case when the original scan reason was PACKET (object still a part of Collection Set) and failed to scan - the object would be added twice (both on the first and the second scan isObjectInEvacuateMemoryNoCheck condition would be true). This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with COPY reason and failed during the scan - the object would neither be added on the first scan due to failed scanning nor be added on the second scan due to not being a part of CS (it's copied, in survivor memory). It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan, but would be added on the rescan as being with PACKET reason (lost info that original scan was DIRTY_CARD). Signed-off-by: Aleksandar Micic <[email protected]>
amicic
pushed a commit
to amicic/openj9
that referenced
this pull request
May 20, 2025
If Ownable Synchronizer object scan (regardless if for PACKET or COPY reason) has not been successful (caused Copy Forward Abort, when a child object fails to copy) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. The existing logic is incorrect for the case when the original scan reason was PACKET (object still a part of Collection Set) and failed to scan - the object would be added twice (both on the first and the second scan isObjectInEvacuateMemoryNoCheck condition would be true). This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with COPY reason and failed during the scan - the object would neither be added on the first scan due to failed scanning nor be added on the second scan due to not being a part of CS (it's copied, in survivor memory). It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan, but would be (incorrectly) added on the rescan as being with PACKET reason (lost info that original scan was DIRTY_CARD). Signed-off-by: Aleksandar Micic <[email protected]>
amicic
pushed a commit
to amicic/openj9
that referenced
this pull request
May 21, 2025
If Ownable Synchronizer object scan (regardless if for PACKET or COPY reason) has not been successful (caused Copy Forward Abort, when a child object fails to copy) it should not be added to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time. The existing logic is incorrect for the case when the original scan reason was PACKET (object still a part of Collection Set) and failed to scan - the object would be added twice (both on the first and the second scan isObjectInEvacuateMemoryNoCheck condition would be true). This is a more correct variant of the first similar attempt to fix eclipse-openj9#20589, which would miss to add the object if originally scanned with COPY reason and failed during the scan - the object would neither be added on the first scan due to failed scanning nor be added on the second scan due to not being a part of CS (it's copied, in survivor memory). It is also a more correct variant of the second attempt eclipse-openj9#21857, which would incorrectly add the object if originally scanned with DIRTY_CARD (as Remembered Set, which is Root, not part of Collection Set) and failed during the scan, but would be (incorrectly) added on the rescan as being with PACKET reason (lost info that original scan was DIRTY_CARD). Signed-off-by: Aleksandar Micic <[email protected]>
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If Ownable Synchronizer object scan has not been successful (caused Copy Forward abort) it should not be aadded to the list right away. This object is remembered in the work packet and is going to be rescanned for the second time.
Relates #20395