Re: [Qemu-devel] [PATCH 13/15] exec: use mmap for PhysPageMap->nodes

[Peter Lieven]

Am 28.06.2016 um 12:43 schrieb Paolo Bonzini:
> On 28/06/2016 11:01, Peter Lieven wrote:
> > this was causing serious framentation in conjunction with the
> > subpages since RCU was introduced. The node space was allocated
> > at approx 32kB then reallocted to approx 75kB and this a few hundred
> > times at startup. And thanks to RCU the freeing was delayed.
> >
> > Signed-off-by: Peter Lieven <address@hidden>
> The size of the node from the previous as->dispatch could be used as a
> hint for the new one perhaps, avoiding the reallocation?

I will figure that out. But still all the PhyPageMaps are allocated before
they are freed. Or are you fine with using mmap here?

Peter