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

From: Peter Lieven
Subject: Re: [Qemu-devel] [PATCH 13/15] exec: use mmap for PhysPageMap->nodes
Date: Tue, 28 Jun 2016 12:48:22 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

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?


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