Re: [Xen-devel] LTTng-Xen Buffer shared between the hypervisor and a dom0 process

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 7/3/07 19:24, "Mathieu Desnoyers" <compudj@xxxxxxxxxxxxxxxxxx> wrote:

> Then, I would like to release some kind of reference count of this
> mapping from the hypervisor. I do the following which results in page
> faults (probably because it tries to free memory still accessed by
> lttd-xen) :

What's the shutdown order you're looking for? It sounds like you want Xen to
tell lttd-xen when it should quit, which seems to me the wrong way round.

 -- Keir

>             free_xenheap_pages(
>                 rawbuf,
>                 get_order_from_bytes(chan->alloc_size * num_possible_cpus()));
> 
> 
> And then, when we are sure that no more data can be written in the
> buffer, lttd-xen is ready to exit. It unmaps the buffer just before exit :
> 
>             err_ret = munmap(pair->mmap, pair->subbuf_size * pair->n_subbufs);
> 
> Do you know any proper way to achieve what I am looking for ?



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