On Mon, Apr 21, 2014 at 5:53 PM, H. Peter Anvin <h...@zytor.com> wrote: > Well, if 2^17 CPUs are allocated we might 2K pages allocated. We could > easily do a bitmap here, of course. NR_CPUS/64 is a small number, and would > reduce the code complexity. >
Even simpler: just get rid of the check entirely. That is, break out of the higher level loops once one of them is set (this should be a big speedup regardless) and don't allocate the page if the first PTE is already pointing at something. After all, espfix_already_there is mostly a duplicate of init_espfix_cpu. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
