[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: Is QoS of virtual disk not necessary?
On Fri, Aug 24, 2007 at 06:40:54PM +0100, Keir Fraser wrote: > On 24/8/07 18:26, "Andi Kleen" <andi@xxxxxxxxxxxxxx> wrote: > > >> Another nice thing would be that if we do not use CFQ then we do not need a > >> kernel thread per VBD. > > > > It would be probably easy to extend CFQ2 to use an user passed identifier > > instead of per task for sharing if that's your goal. For a kernel driver > > like blkback you could just switch around multiple current->io_contexts. > > Does current->io_context get latched before submit_bh() (or whatever similar > function it is we use) returns? Is this true even in older 2.6 kernels with > old CFQ? It obviously has to because you could exit in the next call. The context is reference counted and lazily freed. -Andi _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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