* Peter Williams <[email protected]> wrote:
> Problem:
>
> 2 CPU system: if the cpu-0 has two high priority and cpu-1 has one
> normal priority task, how can the current code detect this imbalance
> because imbalance will be always < busiest_load_per_task and max_load
> - this_load will be < 2 * busiest_load_per_task and pwr_move will be
> <= pwr_now.
>
> Solution:
>
> Modify the assessment of small imbalances to take into account the
> relative sizes of busiest_load_per_task and this_load_per_task. This
> is exploiting the fact that if the difference between the loads is
> greater than busiest_load_per_task and busiest_load_per_task is
> greater than this_load_per_task then moving busiest_load_per_task
> worth of load from busiest to this will be an improvement in the
> distribution of weighted load.
>
> Required patches:
>
> sched-prevent-high-load-weight-tasks-suppressing-balancing.patch
> sched-improve-stability-of-smpnice-load-balancing.patch
>
> Note: This patch makes no change to load balancing in the case where
> all tasks are nice==0.
>
> Signed-off-by: Peter Williams <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
