Alan Cox wrote: > Ar Gwe, 2006-08-18 am 12:32 -0700, ysgrifennodd Dave Hansen: > >>>It ought to be cheap. Given each set of page structs is an array its a >>>simple subtract and divide (or with care and people try to pack them >>>nicely for cache lines - shift) to get to the parallel accounting array. >> >>I wish page structs were just a simple array. ;) > > > Note I very carefully said "each set of" > > >>It will just be a bit more code, but we'll need this for the two other >>memory models: sparsemem and discontigmem. For discontig, we'll just >>need pointers in the pg_data_ts and, for sparsemem, we'll likely need >>another pointer in the 'struct mem_section'. > > > Actually I don't believe this is true in either case. Change the code > which allocates the page arrays to allocate (+ sizeof(void *) * > pages_in_array on the end of each array when using UBC. The rest then > seems to come out naturally. I only doubt what gain we will have in this situation. boot-time selectable vs. CONFIG-selectable?
Kirill ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ ckrm-tech mailing list https://lists.sourceforge.net/lists/listinfo/ckrm-tech
