On 6 January 2014 17:31, Peter Zijlstra <pet...@infradead.org> wrote: > On Mon, Jan 06, 2014 at 02:41:31PM +0100, Vincent Guittot wrote: >> IMHO, these settings will disappear sooner or later, as an example the >> idle/busy _idx are going to be removed by Alex's patch. > > Well I'm still entirely unconvinced by them.. > > removing the cpu_load array makes sense, but I'm starting to doubt the > removal of the _idx things.. I think we want to retain them in some > form, it simply makes sense to look at longer term averages when looking > at larger CPU groups. > > So maybe we can express the things in log_2(group-span) or so, but we > need a working replacement for the cpu_load array. Ideally some > expression involving the blocked load.
Using the blocked load can surely give benefit in the load balance because it gives a view of potential load on a core but it still decay with the same speed than runnable load average so it doesn't solve the issue for longer term average. One way is to have a runnable average load with longer time window > > Its another one of those things I need to ponder more :-) -- 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/
