Hi Joonsoo, On Mon, Nov 03, 2014 at 05:02:08PM +0900, Joonsoo Kim wrote: > On Sat, Nov 01, 2014 at 11:15:54PM -0400, Johannes Weiner wrote: > > Memory cgroups used to have 5 per-page pointers. To allow users to > > disable that amount of overhead during runtime, those pointers were > > allocated in a separate array, with a translation layer between them > > and struct page. > > Hello, Johannes. > > I'd like to leave this translation layer. > Could you just disable that code with #ifdef until next user comes? > > In our company, we uses PAGE_OWNER on mm tree which is the feature > saying who allocates the page. To use PAGE_OWNER needs modifying > struct page and then needs re-compile. This re-compile makes us difficult > to use this feature. So, we decide to implement run-time configurable > PAGE_OWNER through page_cgroup's translation layer code. Moreover, with > this infrastructure, I plan to implement some other debugging feature. > > Because of my laziness, it didn't submitted to LKML. But, I will > submit it as soon as possible. If the code is removed, I would > copy-and-paste the code, but, it would cause lose of the history on > that code. So if possible, I'd like to leave that code now. Please re-introduce this code when your new usecase is ready to be upstreamed. There is little reason to burden an unrelated feature with a sizable chunk of dead code for a vague future user. Thanks -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>