[lkml]   [2010]   [Feb]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 03/12] Export unusable free space index via /proc/pagetypeinfo
> On Tue, Feb 16, 2010 at 04:03:29PM +0900, KOSAKI Motohiro wrote:
> > > Unusuable free space index is a measure of external fragmentation that
> > > takes the allocation size into account. For the most part, the huge page
> > > size will be the size of interest but not necessarily so it is exported
> > > on a per-order and per-zone basis via /proc/pagetypeinfo.
> >
> > Hmmm..
> > /proc/pagetype have a machine unfriendly format. perhaps, some user have own ugly
> > /proc/pagetype parser. It have a little risk to break userland ABI.
> >
> It's very low risk. I doubt there are machine parsers of
> /proc/pagetypeinfo because there are very few machine-orientated actions
> that can be taken based on the information. It's more informational for
> a user if they were investigating fragmentation problems.
> > I have dumb question. Why can't we use another file?
> I could. What do you suggest?

I agree it's low risk. but personally I hope fragmentation ABI keep very stable because
I expect some person makes userland compaction daemon. (read fragmentation index
from /proc and write /proc/compact_memory if necessary).
then, if possible, I hope fragmentation info have individual /proc file.

 \ /
  Last update: 2010-02-16 09:43    [W:0.066 / U:4.956 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site