From owner-freebsd-arch  Fri Jun  7 10:24: 0 2002
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Date: Fri, 7 Jun 2002 10:23:57 -0700
From: Alfred Perlstein <bright@mu.org>
To: John Baldwin <jhb@FreeBSD.org>
Cc: arch@FreeBSD.org
Subject: Re: KTRACE genio trace question
Message-ID: <20020607172357.GS88163@elvis.mu.org>
References: <XFMail.20020607123531.jhb@FreeBSD.org>
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* John Baldwin <jhb@FreeBSD.org> [020607 09:35] wrote:
> 
> What I would like to do is change the behavior of I/O trace events to
> go back to doing the copyin() before the VOP_WRITE(), but to set a max
> limit on the amount of data we will output in the trace.  This limit
> would probably default to a single page and could be a loader tunable
> and sysctl.  This would allow us to get rid of the need for synchronous
> ktrace events cleaning up the ktrace code a bit.  It would also go back
> to using a single VOP_WRITE for all of the the I/O.  Thoughts?

That sounds reasonable.

-Alfred

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