linux-kernel - Re: [PATCH] mm, vmacache: Add kconfig VMACACHE

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Message-ID: <20150122075742.GA11335@dhcp-129-179.nay.redhat.com>
Date:	Thu, 22 Jan 2015 15:57:42 +0800
From:	WANG Chao <chaowang@...hat.com>
To:	Davidlohr Bueso <dave@...olabs.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Michel Lespinasse <walken@...gle.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm, vmacache: Add kconfig VMACACHE_SHIFT

Hi, Davidlohr

On 01/21/15 at 11:46pm, Davidlohr Bueso wrote:
> On Thu, 2015-01-22 at 14:29 +0800, WANG Chao wrote:
> > Add a new kconfig option VMACACHE_SHIFT (as a power of 2) to specify the
> > number of slots vma cache has for each thread. Range is chosen 0-4 (1-16
> > slots) to consider both overhead and performance penalty. Default is 2
> > (4 slots) as it originally is, which provides good enough balance.
> > 
> 
> Nack. I don't feel comfortable making scalability features of core code
> configurable.

Out of respect, is this a general rule not making scalability features
of core code configurable?

Thanks
WANG Chao
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