[Qemu-devel] [RFC] parallelize migration_bitmap_sync()

[Michael R. Hines]

Hi,

Currently migration_bitmap_sync() is very expensive: on the order of 
15-20 milliseconds by my count using timestamps (for a simple 2GB ram 
virtual machine).
Until new EPT processor versions come out in 2014, we need software 
support for cutting this time down much lower........by at least an 
order of magnitude.

Would anyone be opposed to me writing a patch that creates N threads and 
dividing up the migration_bitmap_sync() function to have the dirty page 
scanning run in parallel?

- Michael