On Mon, Jan 02, 2012 at 07:11:41AM -0500, Xin Tong wrote: > In qemu, there is a virtual pc hash table and a physical pc hash > table. virtual pc hash table is used to find tbs until a context > switch. and physical pc hash table keeps all the translated tb. > virtual pc hash table is smaller, accessed with 12 bits and physical > pc hash table is bigger, accessed with 15 bits. the size in the hash > tables are the primary reasons for having 2 hash tables ?
I think not. tb_find_fast use the virtual pc as index to search env->tb_jmp_cache, and check the result of tb_jmp_cache is sane or not. If something goes wrong, it turns to call tb_find_slow to use physical pc to do a slow search. The size should not be the reason for having 2 hash tables. Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia Sinica, Taiwan (R.O.C.) Tel:886-2-2788-3799 #1667 Homepage: http://people.cs.nctu.edu.tw/~chenwj
