linux-kernel - Re: [RFC] mm: show message when updating min_free

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Message-ID: <20140111032708.GL4106@localhost.localdomain>
Date:	Sat, 11 Jan 2014 11:27:08 +0800
From:	Han Pingtian <hanpt@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	David Rientjes <rientjes@...gle.com>, Mel Gorman <mgorman@...e.de>,
	linux-mm@...ck.org, Dave Hansen <dave.hansen@...el.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] mm: show message when updating min_free_kbytes in thp

On Fri, Jan 10, 2014 at 09:17:44AM +0100, Michal Hocko wrote:
> On Fri 10-01-14 00:13:44, Andrew Morton wrote:
> > On Fri, 10 Jan 2014 09:05:04 +0100 Michal Hocko <mhocko@...e.cz> wrote:
> > 
> > > > > --- a/mm/huge_memory.c
> > > > > +++ b/mm/huge_memory.c
> > > > > @@ -100,6 +100,7 @@ static struct khugepaged_scan khugepaged_scan = {
> > > > >  	.mm_head = LIST_HEAD_INIT(khugepaged_scan.mm_head),
> > > > >  };
> > > > >  
> > > > > +extern int user_min_free_kbytes;
> > > > >  
> > > > 
> > > > We don't add extern declarations to .c files.  How many other examples of 
> > > > this can you find in mm/?
> > > 
> > > I have suggested this because general visibility is not needed.
> > 
> > It's best to use a common declaration which is seen by the definition
> > site and all references, so everyone agrees on the variable's type. 
> > Otherwise we could have "long foo;" in one file and "extern char foo;"
> > in another and the compiler won't tell us.  I think the linker could
> > tell us, but it doesn't, afaik.  Perhaps there's an option...
> > 
> > > But if
> > > you think that it should then include/linux/mm.h sounds like a proper
> > > place.
> > 
> > mm/internal.h might suit.
> 
> min_free_kbytes is in mm.h so I thought having them together would be
> appropriate.
> 

At present, we only use user_min_free_kbytes in memory subsystem. So I
think mm/internal.h is suit.

Thanks.

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