Make slow-work thread pool actually dynamic
Make the slow-work thread pool actually dynamic in the number of threads it contains. With this patch, it will both create additional threads when it has extra work to do, and cull excess threads that aren't doing anything. Signed-off-by: NDavid Howells <dhowells@redhat.com> Acked-by: NSerge Hallyn <serue@us.ibm.com> Acked-by: NSteve Dickson <steved@redhat.com> Acked-by: NTrond Myklebust <Trond.Myklebust@netapp.com> Acked-by: NAl Viro <viro@zeniv.linux.org.uk> Tested-by: NDaire Byrne <Daire.Byrne@framestore.com>
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