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SubjectRe: [PATCH 32/63] sched: Avoid overloading CPUs on a preferred NUMA node
On 10/07/2013 06:29 AM, Mel Gorman wrote:
> This patch replaces find_idlest_cpu_node with task_numa_find_cpu.
> find_idlest_cpu_node has two critical limitations. It does not take the
> scheduling class into account when calculating the load and it is unsuitable
> for using when comparing loads between NUMA nodes.
>
> task_numa_find_cpu uses similar load calculations to wake_affine() when
> selecting the least loaded CPU within a scheduling domain common to the
> source and destimation nodes. It avoids causing CPU load imbalances in
> the machine by refusing to migrate if the relative load on the target
> CPU is higher than the source CPU.
>
> Signed-off-by: Peter Zijlstra <peterz@infradead.org>
> Signed-off-by: Mel Gorman <mgorman@suse.de>

Reviewed-by: Rik van Riel <riel@redhat.com>

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