DragonFly commits List (threaded) for 2005-07
cvs commit: src/sys/sys thread.h thread2.h src/sys/kern lwkt_token.c lwkt_thread.c
hmp 2005/07/07 13:28:26 PDT
DragonFly src repository
sys/sys thread.h thread2.h
sys/kern lwkt_token.c lwkt_thread.c
Add counters for recording Token/MPlock contention, this would help in
determining the number of times contention has occured in the system.
The contention counters have been made 64-bit quantities because they
are situated within a tight-loop.
KTR tracepoints have been added for marking start and stop of a token's
contention. New field tr_flags added to struct lwkt_tokref. By adding
tracepoints in lwkt_chktokens(9), it gives us interesting data on MP
machines when it indirectly sends a passive IPI to the remote CPU for
gaining ownership of a token. It would be interesting to see KTR dumps
for a 4-CPU or an 8-CPU system.
Discussed-with: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Revision Changes Path
1.64 +6 -0 src/sys/sys/thread.h
1.21 +1 -0 src/sys/sys/thread2.h
1.22 +18 -0 src/sys/kern/lwkt_token.c
1.76 +20 -3 src/sys/kern/lwkt_thread.c