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[Xen-devel] Re: Is QoS of virtual disk not necessary?
| To: | Andi Kleen <andi@xxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: Is QoS of virtual disk not necessary? |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Fri, 24 Aug 2007 18:40:54 +0100 |
| Cc: | Satoshi Uchida <s-uchida@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Fri, 24 Aug 2007 10:41:45 -0700 |
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| Thread-topic: | Is QoS of virtual disk not necessary? |
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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? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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