Re: [Qemu-devel] Qemu and heavily increased RSS usage

[Stefan Hajnoczi]

On Tue, Jun 21, 2016 at 05:12:57PM +0200, Peter Lieven wrote:
>  - We changed the coroutine pool to a per thread model. I disabled the pool. 
> This seems
>    to cut the max used RSS to about 150MB which is still a lot more than 
> qemu-2.2.0

The per-thread coroutine pools only grow when a thread creates/destroys
coroutines.

The QEMU main loop, iothread, and maybe vcpus should use coroutines.
The numerous thread-pool worker threads should not use coroutines IIRC.

Creating coroutines is expensive and the pools improve performance a
lot.  Maybe you can make observations about how to manage pool size more
efficiently for your VM?

Stefan

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