Attilio Rao 1ae1c2a3bd Reverse the logic for ADAPTIVE_SX option and enable it by default. ... Introduce for this operation the reverse NO_ADAPTIVE_SX option. The flag SX_ADAPTIVESPIN to be passed to sx_init_flags(9) gets suppressed and the new flag, offering the reversed logic, SX_NOADAPTIVE is added. Additively implements adaptive spininning for sx held in shared mode. The spinning limit can be handled through sysctls in order to be tuned while the code doesn't reach the release, after which time they should be dropped probabilly. This change has made been necessary by recent benchmarks where it does improve concurrency of workloads in presence of high contention (ie. ZFS). KPI breakage is documented by __FreeBSD_version bumping, manpage and UPDATING updates. Requested by: jeff, kmacy Reviewed by: jeff Tested by: pho		2009-05-29 01:49:27 +00:00
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kern	Change license to more bori^Wadul^Wcanonical.	2009-05-26 11:42:06 +00:00
rpc	Add FreeBSD IDs to files that originate in FreeBSD.	2008-04-22 07:43:00 +00:00
sys	Reverse the logic for ADAPTIVE_SX option and enable it by default.	2009-05-29 01:49:27 +00:00