linux-kernel - Re: [PATCH] mm: add ratio in slabinfo print

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Message-ID: <alpine.DEB.2.10.1601111619120.5824@chino.kir.corp.google.com>
Date:	Mon, 11 Jan 2016 16:20:56 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
cc:	Michal Hocko <mhocko@...nel.org>, cl@...ux.com,
	Pekka Enberg <penberg@...nel.org>, iamjoonsoo.kim@....com,
	Andrew Morton <akpm@...ux-foundation.org>,
	zhong jiang <zhongjiang@...wei.com>,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: add ratio in slabinfo print

On Mon, 11 Jan 2016, Xishi Qiu wrote:

> > On Mon 11-01-16 11:54:57, Xishi Qiu wrote:
> >> Add ratio(active_objs/num_objs) in /proc/slabinfo, it is used to show
> >> the availability factor in each slab.
> > 
> > What is the reason to add such a new value when it can be trivially
> > calculated from the userspace?
> > 
> > Besides that such a change would break existing parsers no?
> 
> Oh, maybe it is.
> 

If you need the information internally, you could always create a library 
around slabinfo and export the information for users who are interested 
for your own use.  Doing anything other than appending fields to each line 
is too dangerous, however, as a general rule.