linux-kernel - Re: [PATCH -mm v9 0/8] idle memory tracking

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Message-Id: <20150727122527.c6f7786177e9b5096e623d18@linux-foundation.org>
Date:	Mon, 27 Jul 2015 12:25:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	Vladimir Davydov <vdavydov@...allels.com>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Jonathan Corbet <corbet@....net>,
	Linux API <linux-api@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>, Cgroups <cgroups@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm v9 0/8] idle memory tracking

On Mon, 27 Jul 2015 12:18:57 -0700 Kees Cook <keescook@...omium.org> wrote:

> > Why were these put in /proc anyway?  Rather than under /sys/fs/cgroup
> > somewhere?  Presumably because /proc/kpageidle is useful in non-memcg
> > setups.
> 
> Do we need a /proc/vm/ for holding these kinds of things? We're
> collecting a lot there. Or invent some way for this to be sensible in
> /sys?

/proc is the traditional place for such things (/proc/kpagecount,
/proc/kpageflags, /proc/pagetypeinfo).  But that was probably a
mistake.

/proc/sys/vm is rather a dumping ground of random tunables and
statuses, but yes, I do think that moving the kpageidle stuff into there
would be better.
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