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

[Vladimir Davydov]

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@xxxxxxxxxxxxx> 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.

Thanks,
Vladimir
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