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Re: [Qemu-devel] [RFC PATCH V2 1/2] vhost: convert pre sorted vhost memo
Re: [Qemu-devel] [RFC PATCH V2 1/2] vhost: convert pre sorted vhost memory array to interval tree
Thu, 28 Apr 2016 14:20:32 +0800
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0
On 04/27/2016 07:30 PM, Michael S. Tsirkin wrote:
> On Fri, Mar 25, 2016 at 10:34:33AM +0800, Jason Wang wrote:
>> > Current pre-sorted memory region array has some limitations for future
>> > device IOTLB conversion:
>> > 1) need extra work for adding and removing a single region, and it's
>> > expected to be slow because of sorting or memory re-allocation.
>> > 2) need extra work of removing a large range which may intersect
>> > several regions with different size.
>> > 3) need trick for a replacement policy like LRU
>> > To overcome the above shortcomings, this patch convert it to interval
>> > tree which can easily address the above issue with almost no extra
>> > work.
>> > The patch could be used for:
>> > - Extend the current API and only let the userspace to send diffs of
>> > memory table.
>> > - Simplify Device IOTLB implementation.
> Does this affect performance at all?
In pktgen test, no difference.