vm statistics per jail

[carlos antonio neira bustos]

Thanks, Konstantin,

So that means that for a vm_page_t  object the cred member from a
vm_object_t in the vm_page_t will never have it cr_prison struct pointing
to a jail?
Is there a method to associate a vm_page_t to a jail ? as vm_object
contains a cred member I thought I could use that.
Bests

On Sun, Oct 7, 2018 at 6:42 AM Konstantin Belousov <kostikbel at gmail.com>
wrote:

> On Sun, Oct 07, 2018 at 01:20:50AM -0300, carlos antonio neira bustos
> wrote:
> > Hello, Hackers,
> >
> >  I have added mib member vm.vmtotal to be part of a prison with the
> intent
> > that each jail could report the correct memory usage using their vm
> > counters.
> > Unfortunately for me, I found that t_free depends on the global vmmeter
> > counters, so I'm trying to add those as well to the prison struct, that
> > will make consumers of those counters to report the correct information
> > inside a jail.
> >  The problem so far trying to add vmeter is when I'm trying to determine
> to
> > which jail a vm_page_t belongs to using vm_pages_t's object cred struct
> I'm
> > getting a kernel panic due to a page fault.
> > I have modified  vm_phys_freecnt_adj(vm_page_t m, int adj) from
> > /usr/src/sys/vm/vm_phys.h  to increment the vmeter.v_free_count  on the
> > cr_prison that's belongs to vm_page_t.
> > The panic does not produce a dump, so I'm unable to debug the fault.
> > My rc.conf contains dumpdev="AUTO" so I think it should produce a dump or
> > could it be that the panic happens to early?
> > Is it possible to obtain to which cr_prison a vm_page_t  belongs to ?.
>
> No. vm_page_t does not belong to a jail.
>