Messages in this thread | | | Date | Thu, 07 Oct 2010 18:20:53 +0200 | From | Avi Kivity <> | Subject | Re: [PATCH v6 04/12] Add memory slot versioning and use it to provide fast guest write interface |
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On 10/07/2010 06:03 PM, Gleb Natapov wrote: > > > > > > Isn't SET_USER_MEMORY_REGION so slow that calling it 2^32 times > > > isn't really feasible? > > > > Assuming it takes 1ms, it would take 49 days. > > > We may fail ioctl when max value is reached. The question is how much slot > changes can we expect from real guest during its lifetime. >
A normal guest has a 30 Hz timer for reading the vga framebuffer, multiple slots. Let's assume 100 Hz frequency, that gives 490 days until things stop working.
-- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.
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