CA-388210: enable SMAPIv3 concurrent operations by default #6141
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We are going to change how we compute it, so factor it out into a function. No functional change. Signed-off-by: Edwin Török <edwin.torok@cloud.com>
…ument as domain for Dom0 Dom0 allows multiple attaches of RO disks, used e.g. for VDI.copy. Send a unique value to SMAPIv3 plugins to avoid bugs to the lack of reference counting in those plugins. XAPI already sends a unique value here, either vbd/domid/device, or a fresh UUID (for storage migration). Signed-off-by: Edwin Török <edwin.torok@cloud.com>
Log PID on successful and failed operations, and log full cmdline for newly spawned processes. This can be used to debug stuck scripts, so that we know which invocation is the one that is stuck. Signed-off-by: Edwin Török <edwin.torok@cloud.com>
It is believed that the deadlocks in SMAPIv3 were caused by VDI.copy operations that attach the same disk RO multiple times in Dom0. With the previous commits we now use a unique identifier and spawn a separate qemu-dp process in the SMAPIv3 plugins, which should prevent the deadlocks and IO errors due to lack of refcounting. Signed-off-by: Edwin Török <edwin.torok@cloud.com>
edwintorok
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psafont
approved these changes
Nov 29, 2024
last-genius
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Dec 2, 2024
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Testing looks good so far (Storage BST) |
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See #6140 on feature/perf, this is the equivalent PR for master.