On 12 February 2015 at 14:45, Alexander Graf <ag...@suse.de> wrote: > >> On 12.02.2015, at 15:35, Mark Burton <mark.bur...@greensocs.com> wrote: >> We are proposing to implement this by signalling all other CPU’s >> to exit (and requesting they flush before re-starting). In other >> words, this would happen asynchronously. > > For global flushes, give them a pointer payload along with the flush > request and tell all cpus to increment it atomically. In your main > thread, wait until *ptr == nKickedCpus.
I bet this will not be the only situation where you want to do an "get all other CPUs to do $something and wait til they have done so" kind of operation, so some lightweight but generic infrastructure for doing that would not be a bad plan. (Similarly "get all other CPUs to stop, then I can do $something and let the others continue".) -- PMM
