Re: [PATCH v2 1/7] mm/page_ext: resurrect struct page extending code for debugging

2014-11-23 Thread Joonsoo Kim
On Fri, Nov 21, 2014 at 03:37:31PM -0800, Andrew Morton wrote: > On Fri, 21 Nov 2014 17:14:00 +0900 Joonsoo Kim wrote: > > > When we debug something, we'd like to insert some information to > > every page. For this purpose, we sometimes modify struct page itself. > > But, this has drawbacks. Firs

Re: [PATCH v2 1/7] mm/page_ext: resurrect struct page extending code for debugging

2014-11-21 Thread Andrew Morton
On Fri, 21 Nov 2014 17:14:00 +0900 Joonsoo Kim wrote: > When we debug something, we'd like to insert some information to > every page. For this purpose, we sometimes modify struct page itself. > But, this has drawbacks. First, it requires re-compile. This makes us > hesitate to use the powerful d