Re: PATCH(?): linux-2.4.4-pre2: fork should run child first

[Linus Torvalds]

On Sat, 14 Apr 2001, Rik van Riel wrote:
>
> Also, have you managed to find a real difference with this?

It actually makes a noticeable difference on lmbench, so I think adam is
100% right.

> If it turns out to be beneficial to run the child first (you
> can measure this), why not leave everything the same as it is
> now but have do_fork() "switch threads" internally ?

Probably doesn't much matter. We've invalidated the TLB anyway due to the
page table copy, so the cost of switching the MM is not all that
noticeable.

                Linus

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