Re: pmap_qenter() - the page *must* be wired - is violated

On Wed, Oct 05, 2011 at 02:28:01PM +0200, Svatopluk Kraus wrote:
> Hi,
> 
>   I found out that on a few places pmap_qenter() is called on pages
> which are not wired. For example, in the following functions, when
> vm_pager_get_pages() is called, the pages are not wired:
> 
>   exec_map_first_page() in sys/kern/kern_exec.c
>   vm_fault_hold() in sys/vm/vm_fault.c
>   vm_imgact_hold_page() in sys/vm/vm_glue.c
>   vm_object_populate() in sys/vm/vm_object.c
>   mdstart_swap() in sys/dev/md/md.c
> 
>   Is the rule violated or the rule should be changed?

Lets first discuss where did you found the calls to pmap_qenter().
Can you point out exact line numbers of the calls to pmap_qenter()
that you consider problematic ?

In fact, the requirement probably shall be 'no swapout allowed'. E.g.,
the busy page is fully qualified to be used together with pmap_qenter().