linux-kernel - Re: [PATCH] Slabinfo: Fix display format

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Message-ID: <4C1B0D8C.1030906@cs.helsinki.fi>
Date:	Fri, 18 Jun 2010 09:09:16 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	wzt wzt <wzt.wzt@...il.com>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, mpm@...enic.com
Subject: Re: [PATCH] Slabinfo: Fix display format

On 6/17/10 5:10 PM, wzt wzt wrote:
> On Thu, Jun 17, 2010 at 9:45 PM, Christoph Lameter
> <cl@...ux-foundation.org>  wrote:
>> On Thu, 17 Jun 2010, wzt.wzt@...il.com wrote:
>
>> This one may break user space tools that have assumptions about the length
>> of the field. Or do tools not make that assumption?
>
> User space tools usually use sscanf() to extract this field like:
> sscanf(buff, "%s %d", name,&num);
> If %-27s can break some user space tools that have assumptions about
> the length of the field, the orig %-17s can also break it.
> The longest name inotify_event_private_data is 26 bytes in 2.6.34-rc2,
> the tools still can't extract it.

NAK. It's an ABI so the risks of this format cleanup outweight the benefits.

			Pekka
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