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Date:      Fri, 9 Aug 2013 08:48:29 -0700
From:      "David O'Brien" <obrien@FreeBSD.org>
To:        Andriy Gapon <avg@FreeBSD.org>
Cc:        svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org
Subject:   Re: svn commit: r253996 - in head: . sys/cddl/compat/opensolaris/sys sys/cddl/dev/dtrace sys/conf sys/modules/cyclic sys/modules/dtrace/dtio sys/modules/dtrace/dtmalloc sys/modules/dtrace/dtnfscl sys/m...
Message-ID:  <20130809154829.GA12485@dragon.NUXI.org>
In-Reply-To: <201308061551.r76FpuY7056153@svn.freebsd.org>
References:  <201308061551.r76FpuY7056153@svn.freebsd.org>

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On Tue, Aug 06, 2013 at 03:51:56PM +0000, Andriy Gapon wrote:
> Log:
..
>   Also, meaning of DEBUG was overloaded to enable WITNESS support for some
>   OpenSolaris (primarily ZFS) locks.  Now this overloading is removed and
>   that use of DEBUG is replaced with a new option OPENSOLARIS_WITNESS.

You state there is little value in witness tracking for ZFS in UPDATING.
Is there no reasonable way to gain useful lock tracking for ZFS?

At a minimum, shouldn't this also be added to sys/conf/NOTES in the
"# SMP Debugging Options:" section?

-- 
-- David  (obrien@FreeBSD.org)



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