Hello, On 11/03/2010 05:13 PM, Andi Kleen wrote: >> Please fix this regression the patch causes then or give some >> fundamental arguments why we can't satisfy the two requirements >> simultaneously: I just don't understand why it is necessary to cause a >> regression in stacking/low memory support in order to provide the >> performance boost in the way you desire. The two things ought to be >> independent of each other. > > The old stacking relies on per device threads. Per device threads > cannot be combined with per CPU threads, because that would lead > to a thread explosion for large device counts. Dunno the context here but creating WQ_NON_REENTRANT | WQ_MEM_RECLAIM workqueue per device should achieve what you want. It will be per-cpu while reserving only one worker per workqueue, so there won't be explosion of threads. Thanks. -- tejun -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
