* Re: Automatic page sharing/consolidation [not found] <20080416013033.GA3057@nibiru.local> @ 2008-04-16 11:41 ` Avi Kivity 2008-04-16 12:51 ` Izik Eidus 0 siblings, 1 reply; 2+ messages in thread From: Avi Kivity @ 2008-04-16 11:41 UTC (permalink / raw) To: weigelt; +Cc: kvm-devel, linux kernel list Enrico Weigelt wrote: > Hi folks, > > I'm using dozens of VE's / jails to separate applications > (even complete webapps w/ their own httpd) for easier maintenance > and better security. But this tends to consume a lot of memory, > since code sharing (.so's) cannot take effect here (each jail/VE > has it's completely own tree). > > Now I wonder if it might be possible to let the kernel automatically > find out equal pages and map them together. > > A little compasion showed up that at least 50% of the code could be > shared (maybe more with some tuning, and maybe even data). So it's > (IMHO) really worth it. > > Would this be possible ? What had to be done for this ? > Izik (copied) is working on this for kvm. Results so far are very encouraging, but currently merged pages are not swappable. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Automatic page sharing/consolidation 2008-04-16 11:41 ` Automatic page sharing/consolidation Avi Kivity @ 2008-04-16 12:51 ` Izik Eidus 0 siblings, 0 replies; 2+ messages in thread From: Izik Eidus @ 2008-04-16 12:51 UTC (permalink / raw) To: Avi Kivity; +Cc: weigelt, linux kernel list, kvm-devel Avi Kivity wrote: > Enrico Weigelt wrote: >> Hi folks, >> >> I'm using dozens of VE's / jails to separate applications >> (even complete webapps w/ their own httpd) for easier maintenance >> and better security. But this tends to consume a lot of memory, >> since code sharing (.so's) cannot take effect here (each jail/VE >> has it's completely own tree). >> Now I wonder if it might be possible to let the kernel automatically >> find out equal pages and map them together. >> A little compasion showed up that at least 50% of the code could be >> shared (maybe more with some tuning, and maybe even data). So it's >> (IMHO) really worth it. >> >> Would this be possible ? What had to be done for this ? >> > > Izik (copied) is working on this for kvm. Results so far are very > encouraging, but currently merged pages are not swappable. > we have module that posted with kernel patchs in the mm list, you can actualy run it and play with it there were some bugs that we fixed with it, but i am still not sending it, beacuse i change there quite alot of things in order to get swapping possible for the pages that are shared. -- woof. ^ permalink raw reply [flat|nested] 2+ messages in thread
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2008-04-16 11:41 ` Automatic page sharing/consolidation Avi Kivity
2008-04-16 12:51 ` Izik Eidus
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