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

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Message-ID: <20120319141900.GO24602@redhat.com>
Date:	Mon, 19 Mar 2012 15:19:00 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Avi Kivity <avi@...hat.com>,
	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>,
	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

On Mon, Mar 19, 2012 at 02:29:36PM +0100, Peter Zijlstra wrote:
> On Mon, 2012-03-19 at 14:04 +0100, Andrea Arcangeli wrote:
> > For the niche there's the
> > numactl, cpusets, and all sort of bindings already. No need of more
> > niche, that is pure kernel API pollution in my view, the niche has all
> > its hard tools it needs already. 
> 
> Not quite, I've heard that some HPC people would very much like to relax
> some of that hard binding because its just as big a pain for them as it
> is for kvm.

Then I guess if they call hard bindings a big pain, they won't be
excited by the pain you offer them through your new soft binding
syscalls.

It's totally ok for qemu, which will just run 2 syscalls per
vnode.

But with your solution some apps will suffer from the same massive
pain that they're currently suffering. This is why is still niche to me.
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