old top and new -current: missing arcstat sysctl
Alexander Leidinger
Alexander at leidinger.net
Wed Aug 29 05:44:44 UTC 2018
Quoting Mark Johnston <markj at freebsd.org> (from Tue, 28 Aug 2018
10:48:42 -0400):
> On Tue, Aug 28, 2018 at 10:25:39AM -0400, Allan Jude wrote:
>> On 2018-08-28 02:40, Alexander Leidinger wrote:
>> > Hi,
>> >
>> > top reports missing sysctl kstat.zfs.misc.arcstats.other_size for
>> > 12.0-alpha3 with a top from an old-ish -current.
>> >
>> > Is/will this be handled via a compat-11 sysctl (my kernel is without
>> > compat-xx), or did this slip through?
>> That is not something that a compat-xx package can handle.
>
> s/package/kernel option/?
Sorry, the COMPAT_FREEBSDx kernel options was what I had in mind when
I wrote this.
>> That arcstat was broken up into 3 individual stats, which the
>> 12.0-alpha3 version of top will sum together for you.
>>
>> I don't think we've had compat shims like this for previous versions of
>> top, I recall having similar issues when the 'laundry' counter was
>> introduced.
>
> 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.
Bye,
Alexander.
--
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