On 18/06/2015 07:02, Xiao Guangrong wrote: > However, role->level is more hotter than role->smm so that it's also a good > candidate for this kind of trick.
Right, we could give the first 8 bits to role->level, so it can be accessed with a single memory load and extracted with a single AND. Those two are definitely the hottest fields. > And this is only 32 bits which can be operated in a CPU register by a > single memory load, that is why i was worried if it is really needed. However, an 8-bit field can be loaded from memory with a single movz instruction. Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
