linux-kernel - Re: [V5 PATCH 08/26] memcontrol: use N_MEMORY instead N_HIGH

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Message-ID: <20121029213412.GC21640@dhcp22.suse.cz>
Date:	Mon, 29 Oct 2012 22:34:12 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>, Mel Gorman <mgorman@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	x86 maintainers <x86@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Yinghai Lu <yinghai@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasuaki ISIMATU <isimatu.yasuaki@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Balbir Singh <bsingharora@...il.com>,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	cgroups@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.linux-foundation.org
Subject: Re: [V5 PATCH 08/26] memcontrol: use N_MEMORY instead N_HIGH_MEMORY

On Mon 29-10-12 14:08:05, David Rientjes wrote:
> On Mon, 29 Oct 2012, Michal Hocko wrote:
> 
> > > > > N_HIGH_MEMORY stands for the nodes that has normal or high memory.
> > > > > N_MEMORY stands for the nodes that has any memory.
> > > > 
> > > > What is the difference of those two?
> > > > 
> > > 
> > > Patch 5 in the series 
> > 
> > Strange, I do not see that one at the mailing list.
> > 
> 
> http://marc.info/?l=linux-kernel&m=135152595827692

Thanks!

> > > introduces it to be equal to N_HIGH_MEMORY, so 
> > 
> > So this is just a rename? If yes it would be much esier if it was
> > mentioned in the patch description.
> > 
> 
> It's not even a rename even though it should be, it's adding yet another 
> node_states that is equal to N_HIGH_MEMORY since that state already 
> includes all memory.  

Which is really strange because I do not see any reason for yet another
alias if the follow up patches rename all of them (I didn't try to apply
the whole series to check that so I might be wrong here).

> It's just a matter of taste but I think we should be renaming it
> instead of aliasing it (unless you actually want to make N_HIGH_MEMORY
> only include nodes with highmem, but nothing depends on that).

Agreed, I've always considered N_HIGH_MEMORY misleading and confusing so
renaming it would really make a lot of sense to me.
-- 
Michal Hocko
SUSE Labs
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