* Stefan Hajnoczi (stefa...@redhat.com) wrote: > On Thu, Nov 27, 2014 at 04:29:06PM +0000, Dr. David Alan Gilbert wrote: > > * Stefan Hajnoczi (stefa...@redhat.com) wrote: > > > The dirty memory bitmap is managed by ram_addr.h and copied to > > > migration_bitmap[] periodically during live migration. > > > > > > Move the code to sync the bitmap to ram_addr.h where related code lives. > > > > Is this sync code going to need to gain a barrier (although I'm not quite > > sure which) to ensure it's picked up all changes? > > gcc makes these operations a full barrier: > https://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Atomic-Builtins.html
Ah yes; actually our docs/atomics.txt is a good reference - all the operations you're using are in the sequentially consistent half of that doc. Dave > > Stefan -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
