Re: process creation time increases linearly with shmem

[Linus Torvalds <torvalds@osdl.org>]

On Fri, 26 Aug 2005, Rik van Riel wrote:
> On Fri, 26 Aug 2005, Hugh Dickins wrote:
> 
> > Well, I still don't think we need to test vm_file.  We can add an
> > anon_vma test if you like, if we really want to minimize the fork
> > overhead, in favour of later faults.  Do we?
> 
> When you consider NUMA placement (the child process may
> end up running elsewhere), allocating things like page
> tables lazily may well end up being a performance win.

It should be easy enough to benchmark something like kernel compiles etc, 
which are reasonably fork-rich and should show a good mix for something 
like this. Or even just something like "time to restart a X session" after 
you've brought it into memory once.

		Linus
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