Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early updateucode on Intel's CPU

[Yinghai Lu]

On Sat, Dec 15, 2012 at 11:30 AM, H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> wrote:
> What is the point of only managing 2M at a time?  Now you have to have
> more conditionals and you don't get any more memory efficiency.

We don't need to, because real_data is less than 2M, and ramdisk is about 16M.

Also if we set map too large, could have chance to cover mem hole near
1T for AMD HT system.

>
> Filling arbitrarily into the brk is not acceptable... the brk is an O(1)
> area and all brk allocations need to be reserved at compile time, so the
> overflow handling is still necessary.

if run out of BRK, we will get panic, because early_make_pgtable will return -1.

and current BRK already have 64 slop space.

BTW, did you look at smp boot problem with early_level4_pgt version?

Yinghai
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