On Tue, 2012-05-15 at 09:12 -0500, Christoph Lameter wrote: > On Tue, 15 May 2012, Peter Zijlstra wrote: > > > So yes, page migration is a 'serious' problem, but only because the way > > its implemented is sub-optimal. > > For the low-latency cases: page migration needs to be restricted to cpus > that are allowed to run high latency tasks or restricted to a time that no > low-latency responses are needed by the app. This means during setup or > special processing times (maybe after some action was completed). > > A random compaction run can be very bad for a latency critical section. Yes however: 1) low latency doesn't make real-time, time bounds do. 2) the latency impact of migration can be _MUCH_ improved if someone were to care about it. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href