jhb 2006-01-06 18:07:32 UTC
FreeBSD src repository
Modified files:
sys/kern kern_mutex.c kern_sx.c subr_witness.c
sys/sys _lock.h lock.h
Log:
Trim another pointer from struct lock_object (and thus from struct mtx and
struct sx). Instead of storing a direct pointer to a our lock_class
struct in lock_object, reserve 4 bits in the lo_flags field to serve as an
index into a global lock_classes array that contains pointers to the lock
classes. Only debugging code such as WITNESS or INVARIANTS checks and KTR
logging need to access the lock_class member, so this shouldn't add any
overhead to production kernels. It might add some slight overhead to
kernels using those debug options however.
As with the previous set of changes to lock_object, this is going to
completely obliterate the kernel ABI, so be sure to recompile all your
modules.
Revision Changes Path
1.160 +28 -15 src/sys/kern/kern_mutex.c
1.27 +2 -2 src/sys/kern/kern_sx.c
1.210 +33 -25 src/sys/kern/subr_witness.c
1.12 +0 -1 src/sys/sys/_lock.h
1.55 +19 -3 src/sys/sys/lock.h
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