Re: [PATCH 26/31] sched: numa: Make mempolicy home-node aware

[Rik van Riel]

On 11/13/2012 06:12 AM, Mel Gorman wrote:
> From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
>
> Add another layer of fallback policy to make the home node concept
> useful from a memory allocation PoV.
>
> This changes the mpol order to:
>
>   - vma->vm_ops->get_policy	[if applicable]
>   - vma->vm_policy		[if applicable]
>   - task->mempolicy
>   - tsk_home_node() preferred	[NEW]
>   - default_policy

Why is the home node policy not the default policy?

> Note that the tsk_home_node() policy has Migrate-on-Fault enabled to
> facilitate efficient on-demand memory migration.
>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> Cc: Paul Turner <pjt@xxxxxxxxxx>
> Cc: Lee Schermerhorn <Lee.Schermerhorn@xxxxxx>
> Cc: Christoph Lameter <cl@xxxxxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>




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