region_hash_locks man page on HP-UX

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region_hash_locks(5)		   OBSOLETE		  region_hash_locks(5)

NAME
       region_hash_locks - OBSOLETE kernel tunable parameter

DESCRIPTION
       The tunable is obsolete and has been removed.  HP-UX will automatically
       calculate its value based on the system configuration.

       Global kernel structures containing information on a running process or
       memory  usage  are  frequently  accessed or modified by several threads
       concurrently.  To prevent race conditions, these	 structures  are  pro‐
       tected  by  spinlocks (kernel data structures used for synchronization)
       which allow only the spinlock "holder" to  proceed,  while  all	others
       attempting to access the structure must wait.

       Hashed  spinlocks  are used when each instance of such a data structure
       is to be protected, and there are several instances.   Using  a	single
       spinlock	 for  all instances would cause too much contention, but using
       one spinlock per structure wastes memory	 while	the  majority  of  the
       locks are unused at any given time.

       By  allocating  a  pool of hashed locks, a hash function picks one lock
       per group of structures, reducing contention while  conserving  memory.
       The  system-calculated  value  of  sets the size of such a pool for the
       region data structure spinlocks.

WARNINGS
       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter  may	 be  removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may
       cause  changes  to  tunable parameter values.  After installation, some
       tunable parameters may no longer be at the default or recommended  val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, consult the documentation for the kernel software being installed.
       For  information	 about	optional  kernel  software  that  was  factory
       installed on your system, see at

AUTHOR
       was developed by HP.

			   Tunable Kernel Parameters	  region_hash_locks(5)
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