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

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Message-ID: <20160111122553.GB27317@dhcp22.suse.cz>
Date:	Mon, 11 Jan 2016 13:25:53 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Xishi Qiu <qiuxishi@...wei.com>
Cc:	cl@...ux.com, Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>, 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 11-01-16 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?
-- 
Michal Hocko
SUSE Labs