linux-kernel - Re: [PATCH 02/19] mm/mpol: Remove NUMA_INTERLEAVE

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Message-ID: <m2ipcrd0y8.fsf@firstfloor.org>
Date:	Thu, 09 Aug 2012 17:50:55 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, mingo@...nel.org,
	riel@...hat.com, oleg@...hat.com, pjt@...gle.com,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, Lee.Schermerhorn@...com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/19] mm/mpol: Remove NUMA_INTERLEAVE_HIT

Andrea Arcangeli <aarcange@...hat.com> writes:

> Hi,
>
> On Tue, Jul 31, 2012 at 09:12:06PM +0200, Peter Zijlstra wrote:
>> Since the NUMA_INTERLEAVE_HIT statistic is useless on its own; it wants
>> to be compared to either a total of interleave allocations or to a miss
>> count, remove it.
>> 
>> Fixing it would be possible, but since we've gone years without these
>> statistics I figure we can continue that way.
>> 
>> Also NUMA_HIT fully includes NUMA_INTERLEAVE_HIT so users might
>> switch to using that.
>> 
>> This cleans up some of the weird MPOL_INTERLEAVE allocation exceptions.
>
> It's not apparent why you need to remove it for sched-numa. I think I
> see it but it'd be nicer if it would explained so one doesn't need to
> read an internal bit of several patches later to understand why this
> is needed.

Also it still breaks the numactl test suite, as already explained 
multiple times. Without the HIT counter there is no way to check
interleave actually happened.

I'm a bit concerned about patch kits like this ignoring review feedback?

-Andi

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