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

[Stefan Hajnoczi]

On Wed, Jun 22, 2016 at 09:56:06PM +0100, Peter Maydell wrote:
> On 22 June 2016 at 20:55, Peter Lieven <address@hidden> wrote:
> > What makes the coroutine pool memory intensive is the stack size of 1MB per
> > coroutine. Is it really necessary to have such a big stack?
> 
> That reminds me that I was wondering if we should allocate
> our coroutine stacks with MAP_GROWSDOWN (though if we're
> not actually using 1MB of stack then it's only going to
> be eating virtual memory, not necessarily real memory.)

Yes, MAP_GROWSDOWN will not reduce RSS.

It's possible that we can reduce RSS usage of the coroutine pool but it
will require someone to profile the pool usage patterns.

Stefan

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