Messages in this thread |  | | | Subject | Re: Active Memory Defragmentation: Our implementation & problems | | From | Dave Hansen <> | | Date | 03 Feb 2004 23:10:52 -0800 |
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On Tue, 2004-02-03 at 22:57, IWAMOTO Toshihiro wrote: > At 03 Feb 2004 21:54:34 -0800, > Dave Hansen wrote: > > Moving file-backed pages is mostly handled already. You can do a > > regular page-cache lookup with find_get_page(), make your copy, > > invalidate the old one, then readd the new one. The invalidation can be > > done in the same style as shrink_list(). > > Actually, it is a bit more complicated. > I have implemented similar functionality for memory hotremoval. > > See my post about memory hotremoval > http://marc.theaimsgroup.com/?l=linux-kernel&m=107354781130941&w=2 > for details. > remap_onepage() and remapd() in the patch are the main functions.
remap_onepage() is quite a function. 300 lines. It sure does cover a lot of ground. :)
Defragmentation is a bit easier than removal because it isn't as mandatory. Instead of having to worry about waiting on things like writeback, the defrag code can just bail.
--dave
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