lkml.org 
[lkml]   [2012]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 20/31] sched, numa, mm/mpol: Make mempolicy home-node aware
On Thu, Oct 25, 2012 at 02:16:37PM +0200, Peter Zijlstra wrote:
> 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
>
> Note that the tsk_home_node() policy has Migrate-on-Fault enabled to
> facilitate efficient on-demand memory migration.
>

Makes sense and it looks like a VMA policy, if set, will still override
the home_node policy as you'd expect. At some point this may need to cope
with node hot-remove. Also, at some point this must be dealing with the
case where mbind() is called but the home_node is not in the nodemask.
Does that happen somewhere else in the series? (maybe I'll see it later)

--
Mel Gorman
SUSE Labs


\
 
 \ /
  Last update: 2012-11-01 15:21    [W:0.785 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site