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https://github.com/edk2-porting/linux-next.git
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823e75f723
Merge IPC cleanup and scalability patches from Andrew Morton. This cleans up many of the oddities in the IPC code, uses the list iterator helpers, splits out locking and adds per-semaphore locks for greater scalability of the IPC semaphore code. Most normal user-level locking by now uses futexes (ie pthreads, but also a lot of specialized locks), but SysV IPC semaphores are apparently still used in some big applications, either for portability reasons, or because they offer tracking and undo (and you don't need to have a special shared memory area for them). Our IPC semaphore scalability was pitiful. We used to lock much too big ranges, and we used to have a single ipc lock per ipc semaphore array. Most loads never cared, but some do. There are some numbers in the individual commits. * ipc-scalability: ipc: sysv shared memory limited to 8TiB ipc/msg.c: use list_for_each_entry_[safe] for list traversing ipc,sem: fine grained locking for semtimedop ipc,sem: have only one list in struct sem_queue ipc,sem: open code and rename sem_lock ipc,sem: do not hold ipc lock more than necessary ipc: introduce lockless pre_down ipcctl ipc: introduce obtaining a lockless ipc object ipc: remove bogus lock comment for ipc_checkid ipc/msgutil.c: use linux/uaccess.h ipc: refactor msg list search into separate function ipc: simplify msg list search ipc: implement MSG_COPY as a new receive mode ipc: remove msg handling from queue scan ipc: set EFAULT as default error in load_msg() ipc: tighten msg copy loops ipc: separate msg allocation from userspace copy ipc: clamp with min() |
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