On Mon, 2012-07-09 at 10:53 -0400, Rik van Riel wrote: > On 07/09/2012 08:26 AM, Peter Zijlstra wrote: > > On Sun, 2012-07-08 at 14:34 -0400, Rik van Riel wrote: > > >> Do we really want to calculate the amount of CPU time used > >> by a process, and start migrating after just one second? > >> > >> Or would it be ok to start migrating once a process has > >> been scanned once or twice by the NUMA code? > > > > You mean, the 2-3rd time we try and migrate this task, not the memory > > scanning thing as per Andrea, right? > > Indeed. That way we can simply keep a flag somewhere, > instead of iterating over the threads in a process.
Note that the code in -tip needs to iterate over all tasks in order to test all cpus_allowed and mems_allowed masks. But we could keep a process wide intersection of those masks around as well I guess, updating them is a slow path anyway. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
