linux-kernel - Re: [PATCH -mm] slub: document setting min order with debug_guardpage

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Message-ID: <20111216132155.GA14271@redhat.com>
Date:	Fri, 16 Dec 2011 14:21:56 +0100
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH -mm] slub: document setting min order with
 debug_guardpage_minorder > 0

On Tue, Dec 13, 2011 at 04:41:34PM -0800, David Rientjes wrote:
> > > +		When debug_guardpage_minorder > 0 parameter is specified, the
> > > +		minimum possible order is used and cannot be changed.
> > 
> > Well, I'm not sure what you wanted to say, actually?  How does one change
> > debug_guardpage_minorder (or specify it), for example?  Is it a kernel
> > command-line switch?
> > 
> 
> Yeah, we'll need a reference to Documentation/kernel-parameters.txt.
> 
> > Also I'm not sure what "cannot be changed" is supposed to mean.  Does it
> > mean that /sys/cache/slab/cache/order has no effect in that case?
> > 
> 
> Good point, we should say that "this tunable" cannot be used to change the 
> order at runtime if debug_guardpage_minorder is used on the command line.
> 
> Stanislaw, one more revision?

Ehh, I silently hoped that someone else with better English skills could
fix it ;-)

As Andrew already applied my patch (and fix whitespace) I'll post the
incremental patch in the next e-mail.

Thanks
Stanislaw
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