CA-423816 avoid double counting VM overhead memory#7005
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robhoes merged 2 commits intoxapi-project:masterfrom Apr 13, 2026
Merged
CA-423816 avoid double counting VM overhead memory#7005robhoes merged 2 commits intoxapi-project:masterfrom
robhoes merged 2 commits intoxapi-project:masterfrom
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When we are using a known memory configuration it includes the overhead. So we only have to add it when we create a new configuration. Localhost migration in a loop before and after the patch, memory reported by list_domains -memory -bytes: Before: id | uuid | state | tot bytes | max bytes | shadow bytes 17 | 8fc1ada1-... | B H | 4296003584 | 4336898048 | 36700160 18 | 8fc1ada1-... | B H | 4296003584 | 4376743936 | 36700160 19 | 8fc1ada1-... | B H | 4296003584 | 4416589824 | 36700160 20 | 8fc1ada1-... | B H | 4296003584 | 4456435712 | 36700160 21 | 8fc1ada1-... | B H | 4296003584 | 4496281600 | 36700160 22 | 8fc1ada1-... | B H | 4296003584 | 4536127488 | 36700160 23 | 8fc1ada1-... | B H | 4296003584 | 4575973376 | 36700160 24 | 8fc1ada1-... | B H | 4296003584 | 4615819264 | 36700160 25 | 8fc1ada1-... | B H | 4296003584 | 4655665152 | 36700160 26 | 8fc1ada1-... | B H | 4296003584 | 4695511040 | 36700160 After: id | uuid | state | tot bytes | max bytes | shadow bytes 27 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 28 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 29 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 30 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 31 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 32 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 33 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 34 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 35 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 36 | 8fc1ada1-... | B H | 4256157696 | 4297052160 | 36700160 Based on work by Edwin Torok. Signed-off-by: Christian Lindig <[email protected]>
edwintorok
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Apr 10, 2026
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The output looks correct and stable.
You may want to drop the workaround from the quicktests now: https://github.com/xapi-project/xen-api/blob/0673787ff98121c85ea9fb66ae3d8894a5e8ea92/ocaml/quicktest/quicktest_vm_memory.ml#L15C27-L15C47 (there is a workaround_migration flag there that can be dropped completely)
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How about using |
This fix in the previous patch should obsolete the workaround in the quickcheck. Signed-off-by: Christian Lindig <[email protected]>
last-genius
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Would you mind backporting this to 26.1-lcm?
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I will pack port this after a merge. Just ran the updated quickest and it passed. |
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I don't think the quicktests themselves are backported |
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Commit 7238e5f looks relevant; is there a reason to not back port this? |
robhoes
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Apr 13, 2026
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Backport #7008 |
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When we are using a known memory configuration it includes the overhead. So we only have to add it when we create a new configuration.
Localhost migration in a loop before and after the patch, memory reported by list_domains -memory -bytes:
Before:
After:
Based on work by Edwin Torok.