On Mon, Feb 11, 2013 at 01:43:58PM -0800, Dan Magenheimer wrote: > > From: Greg KH [mailto:gregkh@xxxxxxxxxxxxxxxxxxx] > > > So, how about this, please draw up a specific plan for how you are going > > to get this code out of drivers/staging/ I want to see the steps > > involved, who is going to be doing the work, and who you are going to > > have to get to agree with your changes to make it happen. > > : > > Yeah, a plan, I know it goes against normal kernel development > > procedures, but hey, we're in our early 20's now, it's about time we > > started getting responsible. > > Hi Greg -- > > I'm a big fan of planning, though a wise boss once told me: > "Plans fail... planning succeeds". > > So here's the plan I've been basically trying to pursue since about > ten months ago, ignoring the diversion due to "zcache1 vs zcache2" > from last summer. There is no new functionality on this plan > other than as necessary from feedback obtained at or prior to > LSF/MM in April 2012. > > Hope this meets your needs, and feedback welcome! > Dan > > ======= > > ** ZCACHE PLAN FOR PROMOTION FROM STAGING ** > > PLAN STEPS > > 1. merge zcache and ramster to eliminate horrible code duplication > 2. converge on a predictable, writeback-capable allocator > 3. use debugfs instead of sysfs (per akpm feedback in 2011) > 4. zcache side of cleancache/mm WasActive patch > 5. zcache side of frontswap exclusive gets > 6. zcache must be able to writeback to physical swap disk > (per Andrea Arcangeli feedback in 2011) > 7. implement adequate policy for writeback > 8. frontswap/cleancache work to allow zcache to be loaded > as a module > 9. get core mm developer to review > 10. incorporate feedback from review > 11. get review/acks from 1-2 additional mm developers > 12. incorporate any feedback from additional mm reviews > 13. propose location/file-naming in mm tree > 14. repeat 9-13 as necessary until akpm is happy and merges > > STATUS/OWNERSHIP > > 1. DONE as part of "new" zcache; now in staging/zcache > 2. DONE as part of "new" zcache (cf zbud.[ch]); now in staging/zcache > (this was the core of the zcache1 vs zcache2 flail) > 3. DONE as part of "new" zcache; now in staging/zcache > 4. DONE as part of "new" zcache; per cleancache performance > feedback see https://lkml.org/lkml/2011/8/17/351, now > in staging/zcache; dependent on proposed mm patch, see > https://lkml.org/lkml/2012/1/25/300 > 5. DONE as part of "new" zcache; performance tuning only, > now in staging/zcache; dependent on frontswap patch > merged in 3.7 (33c2a174) > 6. PROTOTYPED as part of "new" zcache; protoype is now > in staging/zcache but has bad memory leak; reimplemented > to use sjennings clever tricks and proposed mm patches > with new version posted https://lkml.org/lkml/2013/2/6/437; > rejected by GregKH as it smells like new functionality > > (******** YOU ARE HERE *********) > > 7. PROTOTYPED as part of "new" zcache; now in staging/zcache; > needs more review (plan to discuss at LSF/MM 2013) > 8. IN PROGRESS; owned by Konrad Wilk; v2 recently posted > http://lkml.org/lkml/2013/2/1/542 <nods> This is the frontswap/cleancache being able to use modularized backends. > 9. IN PROGRESS; owned by Konrad Wilk; Mel Gorman provided > great feedback in August 2012 (unfortunately of "old" > zcache) > 10. Konrad posted series of fixes (that now need rebasing) > https://lkml.org/lkml/2013/2/1/566 <nods> That way we can run those and the frontswap in parallel. -- 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>