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:

quoted

On Wed, Jul 29, 2015 at 02:30:15PM -0700, Andrew Morton wrote:

quoted

On Wed, 29 Jul 2015 19:29:08 +0300 Vladimir Davydov [off-list ref] wrote:

quoted

/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 <redacted>
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