linux-kernel - Re: [PATCH] Add Kconfig option for default swappiness

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Date:	Wed, 03 Nov 2010 23:13:31 -0400
From:	Ben Gamari <bgamari.foss@...il.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Jesper Juhl <jj@...osbits.net>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH] Add Kconfig option for default swappiness

On Tue, 2 Nov 2010 12:39:52 -0700 (PDT), David Rientjes <rientjes@...gle.com> wrote:
> On Tue, 2 Nov 2010, Ben Gamari wrote:
> > Packaging concerns, as I mentioned before,
> 
> That you snipped from the changelog?
> 
Guilty as charged. Sorry about that, time has been in short supply
recently.

> You could say the same thing for any sysctl, it's not indicative of why 
> this particular change is needed in the kernel.
> 
This is certainly true; a distribution could in principle want to tweak
the default values of any of the sysctl knobs. If we wanted to tweak
anything else in addition to swappiness that I wouldn't have even
bothered to submit the patch since I'll be the first to admit that the
precedent set by further growing the Kconfig phase space is not a
positive one. That being said, swappiness is one of the more significant
knobs in the vm and certainly one of the more likely to be tuned by a
distribution.

> Let's not have the "in short" answer, what's the "long" answer?

See my recent response to Wu Fengguang.

Cheers,

- Ben
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