linux-kernel - Re: [PATCH] ARM: print cma-reserved pages from show

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Date:	Thu, 26 Mar 2015 13:22:59 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Gregory Fong <gregory.0xf0@...il.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Nicolas Pitre <nico@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	open list <linux-kernel@...r.kernel.org>,
	Yalin Wang <Yalin.Wang@...ymobile.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, vishnu.ps@...sung.com,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] ARM: print cma-reserved pages from show_mem

On Thu, Mar 26, 2015 at 12:30:29PM +0000, Mel Gorman wrote:
> On Thu, Mar 26, 2015 at 11:46:12AM +0000, Russell King - ARM Linux wrote:
> > <SNIP>
> > 
> > Looking at Mel's commit, I don't see a reason why we couldn't use that
> > solution - it gets rid of walking the page array, which has been fraught
> > in the past due to ARM having platforms which have holes in their
> > physical memory.
> > 
> > We could try that solution - I don't see much downside to it.  Most of
> > that information is as debug information for MM stuff anyway, and IMHO
> 
> >From an MM perspective, I can tell you that the information is close to
> useless for debugging anything. It's why I ditched it in that commit and
> AFAIK, no one has ever cared.

In that case, is there much point to show_mem()?  Is it something which
should be considered for removal?

If code serves no useful purpose anymore, we really ought to have a way
to remove it.

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