← 返回 semop 参数数组计入 memcg
v2 2026-10-23

semop 参数数组计入 memcg · v2

SEMOPM 修复：超默认 nsops 才向 memcg 记账，拒绝负值并加锁校验，移除过时 UAPI 警告。

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子 Patch（3）

1/3
ipc/sem: account enlarged sops arrays to memcg
Commit 6a4746ba0619 (“ipc: remove memcg accounting for sops objects in do_semtimedop()”) removed accounting based on the assumption that sops arrays would remain small, describing a maximum cost of tw
2/3
ipc/sem: reject negative SEMOPM values
The SEMOPM field has been stored as an int while semop() receives an unsigned operation count since the beginning of Git history. A negative SEMOPM accepted by proc_dointvec() is converted to a large
3/3
ipc/sem: remove obsolete SEMOPM fragmentation warning
The UAPI comment advises keeping SEMOPM at or below 1000 because a larger operation array may fail due to physical memory fragmentation. Commit e4243b8062c1 (“ipc/sem: play nicer with large nsops all
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