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authorDavid Howells <dhowells@redhat.com>2009-04-03 15:42:35 (GMT)
committerDavid Howells <dhowells@redhat.com>2009-04-03 15:42:35 (GMT)
commit07fe7cb7c7c179f473fd9c823348fd3eb5dad369 (patch)
tree516c959de929a4c39870629e550b3307601fa73f /include/linux/marker.h
parent8fe74cf053de7ad2124a894996f84fa890a81093 (diff)
downloadlinux-fsl-qoriq-07fe7cb7c7c179f473fd9c823348fd3eb5dad369.tar.xz
Create a dynamically sized pool of threads for doing very slow work items
Create a dynamically sized pool of threads for doing very slow work items, such as invoking mkdir() or rmdir() - things that may take a long time and may sleep, holding mutexes/semaphores and hogging a thread, and are thus unsuitable for workqueues. The number of threads is always at least a settable minimum, but more are started when there's more work to do, up to a limit. Because of the nature of the load, it's not suitable for a 1-thread-per-CPU type pool. A system with one CPU may well want several threads. This is used by FS-Cache to do slow caching operations in the background, such as looking up, creating or deleting cache objects. 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>
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