linux-kernel - Re: [RFC][PATCH 00/26] sched/numa

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Date:	Wed, 21 Mar 2012 15:53:56 -0700
From:	Nish Aravamudan <nish.aravamudan@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 00/26] sched/numa

Hi Peter,

Sorry if this has already been reported, but

On Fri, Mar 16, 2012 at 7:40 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>
> Hi All,
>
> While the current scheduler has knowledge of the machine topology, including
> NUMA (although there's room for improvement there as well [1]), it is
> completely insensitive to which nodes a task's memory actually is on.
>
> Current upstream task memory allocation prefers to use the node the task is
> currently running on (unless explicitly told otherwise, see
> mbind()/set_mempolicy()), and with the scheduler free to move the task about at
> will, the task's memory can end up being spread all over the machine's nodes.
>
> While the scheduler does a reasonable job of keeping short running tasks on a
> single node (by means of simply not doing the cross-node migration very often),
> it completely blows for long-running processes with a large memory footprint.
>
> This patch-set aims at improving this situation. It does so by assigning a
> preferred, or home, node to every process/thread_group. Memory allocation is
> then directed by this preference instead of the node the task might actually be
> running on momentarily. The load-balancer is also modified to prefer running
> the task on its home-node, although not at the cost of letting CPUs go idle or
> at the cost of execution fairness.
<snip>

>  [24/26] mm, mpol: Implement numa_group RSS accounting

I was going to try and test this on power, but it fails to build:

  mm/filemap_xip.c: In function ‘__xip_unmap’:
  mm/filemap_xip.c:199: error: implicit declaration of function
‘numa_add_vma_counter’

and I think


>  [26/26] sched, numa: A few debug bits

introduced a new warning:

  kernel/sched/numa.c: In function ‘process_cpu_runtime’:
  kernel/sched/numa.c:210: warning: format ‘%lu’ expects type ‘long
unsigned int’, but argument 3 has type ‘u64’
  kernel/sched/numa.c:210: warning: format ‘%lu’ expects type ‘long
unsigned int’, but argument 4 has type ‘u64’

Thanks,
Nish
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