old top and new -current: missing arcstat sysctl
Alexander Leidinger
Alexander at leidinger.net
Wed Aug 29 09:11:24 UTC 2018
Quoting Eitan Adler <lists at eitanadler.com> (from Tue, 28 Aug 2018
22:54:04 -0700):
> On Tue, 28 Aug 2018 at 22:46, Alexander Leidinger
> <Alexander at leidinger.net> wrote:
>> >
>> > IIRC that would have been the inverted case of running a newer top(1)
>> > with an older kernel lacking the v_laundry_pages sysctl. In general I'd
>> > expect us to support running an older top(1) with newer kernels if we
>> > don't have to bend over backwards to provide compatibility.
>>
>> If the new top is summing the 3 up anyway, it sounds like we could
>> provide the old one as backwards compatibility, even if it is
>> redundant. I rather have an redundant counter and an old top working
>> (in the generic case of what we promise to our users; in this specific
>> case for me I just need to get around to update the jails on the
>> corresponding systems), than bailing out without displaying anything.
>
> I'd support this but don't feel like it justifies breaking the freeze.
> After the 12.x freeze is over I'll implement this.
I would rather say this justifies breaking the freeze. Think about an
user updating to 12.0... and having a 11.x jail inside (maybe as a
first step before updating the jail itself, or not at all because of a
bug in a 12.0 library he haven't found but is hitting the user). We
want him to be able to have top working, don't we?
Bye,
Alexander.
--
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