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Date: Sun, 7 Oct 2018 12:41:50 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: carlos antonio neira bustos <cneirabustos@gmail.com>
Cc: freebsd-hackers@freebsd.org
Subject: Re: vm statistics per jail
Message-ID: <20181007094150.GY5335@kib.kiev.ua>
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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.