Make the slow work pool configurable
authorDavid Howells <dhowells@redhat.com>
Fri, 3 Apr 2009 15:42:35 +0000 (16:42 +0100)
committerDavid Howells <dhowells@redhat.com>
Fri, 3 Apr 2009 15:42:35 +0000 (16:42 +0100)
commit12e22c5e4bc08ab4b05ac079fe40d9891c5e81a0
treee3d34a8f21d4c00dff311dfef564c59a76e1ae70
parent109d9272c423f46604d45fedfe87e21ee0b25180
Make the slow work pool configurable

Make the slow work pool configurable through /proc/sys/kernel/slow-work.

 (*) /proc/sys/kernel/slow-work/min-threads

     The minimum number of threads that should be in the pool as long as it is
     in use.  This may be anywhere between 2 and max-threads.

 (*) /proc/sys/kernel/slow-work/max-threads

     The maximum number of threads that should in the pool.  This may be
     anywhere between min-threads and 255 or NR_CPUS * 2, whichever is greater.

 (*) /proc/sys/kernel/slow-work/vslow-percentage

     The percentage of active threads in the pool that may be used to execute
     very slow work items.  This may be between 1 and 99.  The resultant number
     is bounded to between 1 and one fewer than the number of active threads.
     This ensures there is always at least one thread that can process very
     slow work items, and always at least one thread that won't.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
include/linux/slow-work.h
kernel/slow-work.c
kernel/sysctl.c