reference counting complaints

reference counting complaints

[Kip Macy]

Are these anything to worry about?

(XEN) pt base=398c sh_info=1f6
(XEN) Audit 35: [2ff] Found Self Linear PT t=58000000 pfn=398c
(XEN) Audit 35: type count whent below zero pfn=398c taf=58000000
otaf=580000
02
(XEN) Audit 35: type count!=0 t=5801ffff ot=58000002 c=80000000 pfn=398c
(XEN)      found dom=35 i=2ff pfn=398c t=5801ffff c=80000000
(XEN)      found dom=35 i=3fb pfn=398c t=5801ffff c=80000000
(XEN)      found dom=35 i=362 pfn=398b t=36000000 c=80000001
(XEN) Audit 35: gen count!=1 (c=80000000) t=5801ffff ot=58000002
pfn=398c
(XEN)      found dom=35 i=2ff pfn=398c t=5801ffff c=80000000
(XEN)      found dom=35 i=3fb pfn=398c t=5801ffff c=80000000
(XEN)      found dom=35 i=362 pfn=398b t=36000000 c=80000001
(XEN) Audit 35: Done. ctot=879 ttot=4
(XEN) (file=domain.c, line=242) Releasing task 35



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Re: reference counting complaints

[Ian Pratt]

> Are these anything to worry about?

Assuming the domain disappeared after it exited, no, there's
nothing to worry about.

In debug builds we run the audit code before destroying the
domain. In the case you posted, the audit code finds a recursive
PGD mapping, and prints some information about it. It's quite
chatty because such mappings aren't created by Linux, so its
deemed to be noteworthy. For FreeBSD and NetBSD this is normal
behaviour, so nothing to worry about.

We could quieten the debug build message down, but since both
recursive and external PGD mappings are tricky to deal with I
actually find it quite reassuring to have the debug message
coming out to announce that everything is actually working
just fine...

Ian


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Re: reference counting complaints

[Kip Macy]

>
> We could quieten the debug build message down, but since both
> recursive and external PGD mappings are tricky to deal with I
> actually find it quite reassuring to have the debug message
> coming out to announce that everything is actually working
> just fine...

I have no interest in seeing it quieted down :-). I was just concerned
that the type count != 0 and gen count != 1 might mean something bad.


Thanks.

				-Kip


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