On Thu, Oct 07, 2010 at 06:20:53PM +0200, Avi Kivity wrote: > 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. > And reading vga framebuffer needs slots changes because of dirty map tracking? -- Gleb. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>