Changes

No change in size ,  15:12, 27 April 2017
m
no edit summary
Line 26: Line 26:  
* Only MAP_PRIVATE | MAP_ANONYMOUS will be supported in the 1st version due to kernel constraints.
 
* Only MAP_PRIVATE | MAP_ANONYMOUS will be supported in the 1st version due to kernel constraints.
 
* Userfault is known not to map one page into two places. Thus -- COW-ed pages will get COW-ed.
 
* Userfault is known not to map one page into two places. Thus -- COW-ed pages will get COW-ed.
* Andrea (author) states that UFFDIO_REMAP might be slow as compared to UUFDIO_COPY. Probably it makes sense to copy data into tasks, not move.
+
* Andrea (author) states that UFFDIO_REMAP might be slow as compared to UFFDIO_COPY. Probably it makes sense to copy data into tasks, not move.
 
* Unmaps and mremaps can screw things up. Either we have to make uffd-s per VMA or add events about such things.
 
* Unmaps and mremaps can screw things up. Either we have to make uffd-s per VMA or add events about such things.
 
* Forks are even worse -- kid will just populate its memory with zero pages :(
 
* Forks are even worse -- kid will just populate its memory with zero pages :(
62

edits