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Patch: create/destroy optimization for pipes
The dedicated pipe code is quite a bit faster than the socket code. Here's a
comparison from libmicro, with PIPE_SOCKETPAIR on the right. This does not
test page loaning.
Creating and destroying pipes is very expensive because VA space and memory
must be allocated and freed from kernel_map. This causes global TLB
shootdowns, meaning interrupts on MP systems.
The below patch:
- Caches VA space and memory for the reader side of pipes, which take care
of buffering when the pipe is normal (ie uni-directional). This eliminates
the TLB shootdowns.
- It converts the pipe code to use mutex_obj_alloc(), replacing its custom
- It makes better use of pool_cache, eliminating a lot of calls to
initialize and destroy pipe objects.
- It may not apply cleanly to -current.
- The sender-size buffer record needs to be zeroed out after a pipe is
allocated. The patch omits this.
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