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Date:      Tue, 28 Aug 2018 22:54:04 -0700
From:      Eitan Adler <lists@eitanadler.com>
To:        Alexander Leidinger <Alexander@leidinger.net>
Cc:        freebsd-current Current <freebsd-current@freebsd.org>
Subject:   Re: old top and new -current: missing arcstat sysctl
Message-ID:  <CAF6rxgmg5AMn60zakek6sYBaQBhG6ROe4T5SH7ZpvEN%2B3=N7fw@mail.gmail.com>
In-Reply-To: <20180829074431.Horde.NYx7i7jvhNMNuTj-hSYfzSk@webmail.leidinger.net>
References:  <20180828084015.Horde.JUeG828X_SDlJjeJdfmH7pV@webmail.leidinger.net> <d7834f4e-f1ca-c02a-6fe1-472b8737058c@freebsd.org> <20180828144842.GA29917@raichu> <20180829074431.Horde.NYx7i7jvhNMNuTj-hSYfzSk@webmail.leidinger.net>

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On Tue, 28 Aug 2018 at 22:46, Alexander Leidinger
<Alexander@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.




-- 
Eitan Adler



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