i forgot the most important thing this is request for comment, not any more than this (as you can see it doesnt have clean up function) so all i am trying to get here, is your ideas to what to do with it now. add one of the options below?, add both of them?, not at all?
anyway thanks! :) > On Sat, 2007-08-18 at 22:51 +0300, Izik Eidus wrote: > > this patch make kvm dynamicly allocate memory to its mmu pages buffer. > > > > untill now kvm used to allocate just 1024 pages ( 4MB ) no matter what > > was the guest ram size. > > > > beacuse the mmu pages buffer was very small alot of pages that had > > "correct" information about the guest pte, had to be released. > > > > what i did here is the first step to get one or both of the below > > options: > > > > 1)adding support to kvm to increase and decrease at runtime its mmu > > pages buffer by considering how much times the mmu_free_some_pages > > function is called. > > > > 2)adding support to kvm to share the mmu buffers with all VMs that run, > > in this case an idle vm will give some of it mmu buffer to "highly > > working vm" > > > > i wrote this patch with this 2 options in mind, and therefor > > i used lists and not arry, and created each entry of the list 1MB > > (holding list of 256 pages). > > it is now very easy and inexpensive to delete/add/move or doing anything > > we want with this 1MB block. > > > > ugly "benchmark" i ran showed that when the guest used 1% of 512mb vm to > > its mmu buffer and compiled the linux kernel with -j 8 it had number of > > 21,100,000 fix page_fault exits and it took 8:10 secs > > > > when the same guest with the same number of ram used 2% of the 512mb bm > > to its mmu buffer it compiled the linux kernel with -8 at 7:48 secs and > > had just 17,500,000 fix page_faults exits. > > > > (as far as the guest will have more ram the results should be much > > faster than without this patch) > > > > (this benchmark was really ugly, i didnt use ram drive or anything like > > that to compiling it..) > > > > ohh, i must to add that i added a function to remove the lists and all > > the pages it allocated to the mmu pages, but i didnt write any line in > > it because i want to ask avi something first, so dont blame me for > > stealing your ram :) > > > > anyway enjoy. > > ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
