Andi Kleen <[email protected]> writes:
> > Thus with "normal" page clear and "nt" page copy routines
> > both clear and copy benchmarks run faster than with
> > stock kernel, both with small and large working set.
> >
> > Am I wrong?
>
> fork is only a corner case. The main case is a process allocating
> memory using brk/mmap and then using it.
Key point: "using it". This normally involves writes to memory. Most
applications don't commonly read memory that they haven't previously
written to. (valgrind et al call that behaviour a "bug" :).
Given that, I'd say you really don't want the page zero routines
touching the cache.
Michael.
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