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

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Message-ID: <20150731093457.GG8100@esperanza>
Date:	Fri, 31 Jul 2015 12:34:57 +0300
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Michal Hocko <mhocko@...nel.org>,
	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>,
	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@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm v9 0/8] idle memory tracking

On Thu, Jul 30, 2015 at 04:01:22PM +0300, Vladimir Davydov wrote:
> On Thu, Jul 30, 2015 at 12:12:12PM +0300, Vladimir Davydov wrote:
> > On Wed, Jul 29, 2015 at 02:30:15PM -0700, Andrew Morton wrote:
> > > On Wed, 29 Jul 2015 19:29:08 +0300 Vladimir Davydov <vdavydov@...allels.com> wrote:
> > > 
> > > > /proc/kpageidle should probably live somewhere in /sys/kernel/mm, but I
> > > > added it where similar files are located (kpagecount, kpageflags) to
> > > > keep things consistent.
> > > 
> > > I think these files should be moved elsewhere.  Consistency is good,
> > > but not when we're being consistent with a bad thing.
> > > 
> > > So let's place these in /sys/kernel/mm and then start being consistent
> > > with that?
> > 
> > I really don't think we should separate kpagecgroup from kpagecount and
> > kpageflags, because they look very similar (each of them is read-only,
> > contains an array of u64 values referenced by PFN). Scattering these
> > files between different filesystems would look ugly IMO.
> > 
> > However, kpageidle is somewhat different (it's read-write, contains a
> > bitmap) so I think it's worth moving it to /sys/kernel/mm. We have to
> > move the code from fs/proc to mm/something then to remove dependency
> > from PROC_FS, which would be unnecessary. Let me give it a try.
> 
> Here it goes:
> 
> From: Vladimir Davydov <vdavydov@...allels.com>
> Subject: [PATCH] Move /proc/kpageidle to /sys/kernel/mm/page_idle/bitmap

Since it is rather difficult to merge it into proc-add-kpageidle, should
I resend the whole series with all fixes included, provided you find
this patch OK of course?

Thanks,
Vladimir
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