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Re: rhel4u2 kernel experiences
- From: Martin Hunt <hunt at redhat dot com>
- To: "Frank Ch. Eigler" <fche at redhat dot com>
- Cc: systemtap at sources dot redhat dot com
- Date: Sun, 21 Aug 2005 14:40:12 -0700
- Subject: Re: rhel4u2 kernel experiences
- Organization: Red Hat Inc.
- References: <20050821122723.GA28547@redhat.com>
On Sun, 2005-08-21 at 08:27 -0400, Frank Ch. Eigler wrote:
> Hi -
>
> The tentative RHEL4U2 kernel (2.6.9-16.EL) running on FC3, with
> hand-recompiled elfutils-113 .src.rpm and a hand-compiled systemtap
> CVS, shows the best test results and functionality I've seen yet.
>
> On the down side, return probes seem fragile. For example,
> running this script:
> probe kernel.function("sys_read") { log ("a") }
> probe kernel.function("sys_read").return { log ("b") }
> results in 128 "a" messages, and countless "b" ones.
Maybe a side effect of the sys_read() feedback loop with the new
transport?
Martin