linux-kernel - Re: [patch 1/3] slub: add per-cache slab thrash ratio

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Date:	Tue, 31 Mar 2009 10:35:55 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Martin Bligh <mbligh@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/3] slub: add per-cache slab thrash ratio

On Tue, 31 Mar 2009, Christoph Lameter wrote:

> > I'd agree that it should be cleared if the tunable had object units
> > instead of a ratio, but the ratio simply applies to any given order.
> 
> Right but resetting the order usually has a significant impact on the
> threashing behavior (if it exists). Why would we keep the threshing ratio
> that was calculated for another slab configuration?
> 

Either the default thrashing ratio is being used and is unchanged from 
boot time in which case it will still apply to the new order, or the ratio 
has already been changed and userspace is responsible for tuning it again 
as the result of the new slab size.
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