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Re: [Qemu-devel] [RFC v4 1/9] exec.c: Add new exclusive bitmap to ram_li
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [RFC v4 1/9] exec.c: Add new exclusive bitmap to ram_list |
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Date: |
Thu, 10 Sep 2015 18:25:50 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 |
On 10/09/2015 15:04, alvise rigo wrote:
> Hi Paolo,
>
> A brief update on this. I have a first implementation of the idea you
> proposed, though it's not working really well. The failing rate of SCs
> for some reason is very high.
> Instead of trying to fix it, I came up with this alternative design:
> we still use 8 bits per page and we group the smp_cpus in clusters of
> maximum size ceiling(smp_cpus / 8).
> Given a byte describing a certain page, its first bit will represents
> the vCPUs of index 0, 9, 17, ... and so on for the other bits.
>
> Note that systems with eight vCPUs or less will not be affected by
> this simplified model.
>
> Now, unless I'm missing some advantages of your proposal except the
> less aggressive memory consumption, I would go with this design.
Sounds great.
Paolo