linux-kernel - Re: [RFC] fs, proc: Introduce the /proc/<pid>/map

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Date:	Fri, 26 Aug 2011 17:23:34 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Tejun Heo <tj@...nel.org>
Cc:	Cyrill Gorcunov <gorcunov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	linux-kernel@...r.kernel.org,
	James Bottomley <jbottomley@...allels.com>,
	containers@...ts.osdl.org, Andi Kleen <andi@...stfloor.org>,
	Nathan Lynch <ntl@...ox.com>,
	LINUXFS-ML <linux-fsdevel@...r.kernel.org>,
	Zan Lynx <zlynx@....org>, Daniel Lezcano <dlezcano@...ibm.com>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: [RFC] fs, proc: Introduce the /proc/<pid>/map_files/ directory v2

On Fri, Aug 26, 2011 at 04:06:20PM +0200, Tejun Heo wrote:
> > +struct map_files_info {
> > +	struct file	*file;
> > +	unsigned char	name[16+16+2]; /* max: %016lx-%016lx\0 */
> > +	unsigned long	len;
> > +};
> 
> That's slightly above 50 bytes.

We can use 4 * sizeof(unsigned long) + 2 for name to save a bit on 32 bit
architectures.

BTW, show_map_vma() uses "%08lx-%08lx" to print ->start, ->end. I think
it's good idea to use this here as well to be consistent with
/proc/$PID/{s,}maps

-- 
 Kirill A. Shutemov
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