On 04/05/17 10:09, Jan Beulich wrote:
> See the code comment.
>
> Signed-off-by: Jan Beulich <jbeul...@suse.com>
Acked-by: Andrew Cooper <andrew.coop...@citrix.com>
>
> --- a/xen/arch/x86/mm/p2m.c
> +++ b/xen/arch/x86/mm/p2m.c
> @@ -480,6 +480,22 @@ struct page_info *get_page_from_gfn_p2m(
> p2m_access_t _a;
> p2m_type_t _t;
> mfn_t mfn;
> +#ifndef NDEBUG
> + /*
> + * Temporary debugging code, added in the hope of finding the origin
> + * of calls to get_page(..., dom_cow) as observed during osstest
> + * migration failures (see
> + * lists.xenproject.org/archives/html/xen-devel/2017-04/msg03331.html).
> + */
> + static unsigned long cnt, thr;
> +
> + if ( d->is_dying && ++cnt > thr )
> + {
> + thr |= cnt;
> + printk("%pv: d%d dying (looking up %lx)\n", current, d->domain_id,
> gfn);
> + dump_execution_state();
> + }
> +#endif
>
> /* Allow t or a to be NULL */
> t = t ?: &_t;
>
>
>
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