Darren Reed wrote:
Stephan Uphoff wrote:
ups 2007-11-08 14:47:55 UTC
FreeBSD src repository
Modified files:
share/man/man9 locking.9 sys/conf files
sys/kern subr_lock.c subr_pcpu.c subr_smp.c
sys/sys lock.h pcpu.h smp.h Added files:
share/man/man9 rmlock.9 sys/kern
kern_rmlock.c sys/sys _rmlock.h rmlock.h Log:
Initial checkin for rmlock (read mostly lock) a multi reader single
writer
lock optimized for almost exclusive reader access. (see also rmlock.9)
Is there a white paper or other documentation around somewhere that
discusses the benefits/tradeoffs with using rmlock vs rwlock?
For example, how long can a write be delayed if there are lots of reads
being executed? What sort of performance penalty does the write
suffer as a consequence of this vs rwlock, if any?
At what percentage of read vs write operations does it become better
to use rmlock vs rwlock?
Cheers,
Darren
locking(9) is supposed to give an overview..
(but needs input from people to improve it)
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