rwatson 2007-02-26 20:47:52 UTC
FreeBSD src repository
Modified files:
sys/sys unpcb.h
sys/kern uipc_usrreq.c
Log:
Revise locking strategy used for UNIX domain sockets in order to improve
concurrency:
- Add per-unpcb mutexes protecting unpcb connection state, fields, etc.
- Replace global UNP mutex with a global UNP rwlock, which will protect the
UNIX domain socket connection topology, v_socket, and be acquired
exclusively before acquiring more than per-unpcb at a time in order to
avoid lock order issues.
In performance measurements involving MySQL, this change has little or no
overhead on UP (+/- 1%), but leads to a significant (5%-30%) improvement in
multi-processor measurements using the sysbench and supersmack benchmarks.
Much testing by: kris
Approved by: re (kensmith)
Revision Changes Path
1.197 +468 -222 src/sys/kern/uipc_usrreq.c
1.22 +1 -0 src/sys/sys/unpcb.h
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