linux-kernel - Re: [PATCH] kthread: NUMA aware kthread_create_on

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Message-ID: <20101128230146.GB12300@basil.fritz.box>
Date:	Mon, 29 Nov 2010 00:01:47 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>, Tejun Heo <tj@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH] kthread: NUMA aware kthread_create_on_cpu()

On Sun, Nov 28, 2010 at 11:51:51PM +0100, Eric Dumazet wrote:
> > Also this messes up the policy of the caller process. You really
> > need to save/restore it.
> 
> Well, caller process duty is to create kthreads in a loop.

In this case any other allocations it may do are still on those
nodes.

> > Problem is that this ends up in architecture specific code
> > for the stack, so may be a larger patch.
> 
> I suggest arches that need slab to allocate kthread stacks do the
> appropriate changes, because I am not able to make them myself.
> 
> On x86, we use page allocator only, so NUMA mempolicy is used.

task_struct is always allocated from slab.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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