Re: Linux 2.4.2 fails to merge mmap areas, 700% slowdown.

[Linus Torvalds]

On Tue, 20 Mar 2001, Serge Orlov wrote:
>
> I upgraded one of our computer happily running 2.2.13 kernel
> to 2.4.2. Everything was OK, but compilation time of our C++
> project greatly increased (1.4 times slower). I investigated the
> issue and found that g++ spends 7 times more time in kernel.
> The reason for this is big vm map:

Cool. Somebody actually found a real case.

I'll fix the mmap case asap. Its' not hard, I just waited to see if it
ever actually triggers. Something like g++ certainly counts as major.

Are you willing to test out patches?

		Linus