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Subject[PATCH] staging: zcache: add TODO file
Add zcache TODO file

Signed-off-by: Dan Magenheimer <>
drivers/staging/zcache/TODO | 69 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 69 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/zcache/TODO

diff --git a/drivers/staging/zcache/TODO b/drivers/staging/zcache/TODO
new file mode 100644
index 0000000..c1e26d4
--- /dev/null
+++ b/drivers/staging/zcache/TODO
@@ -0,0 +1,69 @@
+Last updated: Feb 13, 2013
+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
+1. DONE as part of "new" zcache; in staging/zcache for 3.9
+2. DONE as part of "new" zcache (cf zbud.[ch]); in staging/zcache for 3.9
+ (this was the core of the zcache1 vs zcache2 flail)
+3. DONE as part of "new" zcache; in staging/zcache for 3.9
+4. DONE (w/caveats) as part of "new" zcache; per cleancache performance
+ feedback see, in
+ staging/zcache for 3.9; dependent on proposed mm patch, see
+5. DONE as part of "new" zcache; performance tuning only,
+ in staging/zcache for 3.9; dependent on frontswap patch
+ merged in 3.7 (33c2a174)
+6. DONE (w/caveats), prototyped as part of "new" zcache, had
+ bad memory leak; reimplemented to use sjennings clever tricks
+ and proposed mm patches with new version in staging/zcache
+ for 3.9, see;
+7. PROTOTYPED as part of "new" zcache; in staging/zcache for 3.9;
+ needs more review (plan to discuss at LSF/MM 2013)
+8. IN PROGRESS; owned by Konrad Wilk; v2 recently posted
+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)
+11. NOT DONE; owned by Konrad Wilk
+12. TBD (depends on quantity of feedback)
+13. PROPOSED; one suggestion proposed by Dan; needs more ideas/feedback
+14. TBD (depends on feedback)
+Not sure. Seth Jennings is now pursuing a separate but semi-parallel
+track. Akpm clearly has to approve for any mm merge to happen. Minchan
+Kim has interest but may be happy if/when zram is merged into mm. Konrad
+Wilk may be maintainer if akpm decides compression is maintainable
+separately from the rest of mm. (More LSF/MM 2013 discussion.)
+A. Support zsmalloc as an alternative high-density allocator
+ (See
+B. Support zero-filled pages more efficiently
+C. Possibly support three zbuds per pageframe when space allows

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