linux-kernel - Re: [patch 2/3] smaps: add pages referenced count to smaps

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Message-Id: <20070206220632.31c6dd9e.akpm@linux-foundation.org>
Date:	Tue, 6 Feb 2007 22:06:32 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Hugh Dickins <hugh@...itas.com>, Paul Mundt <lethal@...ux-sh.org>,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/3] smaps: add pages referenced count to smaps

On Tue, 6 Feb 2007 21:56:23 -0800 (PST) David Rientjes <rientjes@...gle.com> wrote:

> On Tue, 6 Feb 2007, Andrew Morton wrote:
> 
> > > @@ -190,18 +191,20 @@ static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats
> > >  
> > >  	if (mss)
> > >  		seq_printf(m,
> > > -			   "Size:          %8lu kB\n"
> > > -			   "Rss:           %8lu kB\n"
> > > -			   "Shared_Clean:  %8lu kB\n"
> > > -			   "Shared_Dirty:  %8lu kB\n"
> > > -			   "Private_Clean: %8lu kB\n"
> > > -			   "Private_Dirty: %8lu kB\n",
> > > +			   "Size:           %8lu kB\n"
> > > +			   "Rss:            %8lu kB\n"
> > > +			   "Shared_Clean:   %8lu kB\n"
> > > +			   "Shared_Dirty:   %8lu kB\n"
> > > +			   "Private_Clean:  %8lu kB\n"
> > > +			   "Private_Dirty:  %8lu kB\n"
> > > +			   "Pgs_Referenced: %8li\n",
> > 
> > I guess we might as well make this %8lu kB as well?
> > 
> 
> Ah, %8lu would work since it's a count of pages and not a size.

All the other fields in there are using kbytes.  We might as well be
consistent.

Plus if we express the quantity in bytes, userspace doesn't need to know
what the pagesize is.  If we were to express it in pages, an app on a 64k
pagesize kernel will show very different numbers from the same app on a 4k
pagesize kernel.

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