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Author:
Source
Martin Pieuchot (mpi@) has
committed
a change unlocking the
mmap(2),
munmap(2),
and
mprotect(2)
system calls:
CVSROOT: /cvs Module name: src Changes by: mpi@cvs.openbsd.org 2022/11/08 04:05:57 Modified files: sys/kern : syscalls.master Log message: Mark mmap(2), munmap(2) and mprotect(2) as NOLOCK. Accesses to data structures used by these syscalls are serialized by the VM map lock with the exception of file mappings which are still protected by the KERNEL_LOCK(). Unlocking this set of syscalls improves most of userland workloads. Tested by many including robert@ (since 2 years), mlarkin@, kn@, sdk@, jca@, aoyama@, naddy@, Scott Bennett and others. Thanks to all! Joint work with kn@. ok robert@, aja@, kettenis@, kn@, deraadt@, beck@
The improvement in workload performance can
be quite marked.
Following Martin’s
request for testing,
Mike Larkin (mlarkin@)
reported build performance improvement of over 12%!