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From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH -mm v9 0/8] idle memory tracking
Date: Mon, 27 Jul 2015 12:25:27 -0700
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To: Kees Cook <keescook@chromium.org>
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On Mon, 27 Jul 2015 12:18:57 -0700 Kees Cook <keescook@chromium.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.