On Tue, Aug 13, 2013 at 12:38 AM, Peter Zijlstra <pet...@infradead.org> wrote:
> On Tue, Aug 13, 2013 at 12:45:12PM +0800, Lei Wen wrote:
>> > Not quite right; I think you need busiest->cfs.h_nr_running.
>> > cfs.nr_running is the number of entries running in this 'group'. If
>> > you've got nested groups like:
>> >
>> > 'root'
>> > \
>> > 'A'
>> > / \
>> > t1 t2
>> >
>> > root.nr_running := 1 'A', even though you've got multiple running tasks.
>> >
>>
>> You're absolutely right for this. :)
>> I miss it for not considering the group case...
>>
>> Then do you think it is necessary to do below change in load_balance() code?
>> - if (busiest->nr_running > 1) {
>> + if (busiest->cfs.h_nr_running > 1) {
>>
>
> Yes I think that would be fine.
If we pivot to use h_nr_running we should probably also update
call-sites such as cpu_load_avg_per_task() for consistency.
--
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/
