Re: [patch] fork() speedup, 2.1.90

Jakub Jelinek (jj@sunsite.ms.mff.cuni.cz)
Thu, 19 Mar 1998 14:29:40 +0100 (MET)

>
>
> The biggest overhead in current Linux's fork() latency is the creation
> of new page tables. This patch implements 'page table caching', a way to
> preserve constructed state after a process exits. Timings on a 100 MHz
> P5:
>

Oh no, Ingo, save yourself the work and look sometimes into vger CVS.
Page table caching is implemented for all the platforms but m68k's pgd/pmd's
(just pte's are cached on m68k). It is tested and hopefully should go to the
mainstream during the upcoming merge.
But yes, it makes a big difference.

There are some further things I want to do to speed up exit, but I'm waiting
for the merge - it would be mess otherwise.

Cheers,
Jakub
___________________________________________________________________
Jakub Jelinek | jj@sunsite.mff.cuni.cz | http://sunsite.mff.cuni.cz
Administrator of SunSITE Czech Republic, MFF, Charles University
___________________________________________________________________
Ultralinux - first 64bit OS to take full power of the UltraSparc
Linux version 2.1.89 on a sparc64 machine (498.80 BogoMips).
___________________________________________________________________

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