Re: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U0

From: Robert Wisniewski (bob_at_watson.ibm.com)
Date: 10/15/04

  • Next message: Josh Boyer: "Re: Fw: signed kernel modules?" 
    Date:	Fri, 15 Oct 2004 08:27:10 -0400 (EDT)
To: Lee Revell <rlrevell@joe-job.com>

    Lee Revell writes:
    > On Thu, 2004-10-14 at 22:00, Robert Wisniewski wrote:
    > > Theoretically a problem, in practice not, i.e., good enough for soft/normal
    > > real-time, not hard real-time; probably wouldn't want my heart monitor on
    > > it, but then I wouldn't be using Linux for that either :-)
    >
    > Also, the issue here is how we do debug logging. You would presumably
    > not use this at all in production.
    >
    > Lee

    Yes actually you would. If the tracing subsystem is designed correctly you
    leave it in for production systems and enable it when you need to find a
    problem. The reason is because many times you can not reproduce a problem
    someone in production is seeing in your environment. In addition to the
    LTT/Relayfs and K42 tracing work, lots of of tracing work/papers suggest
    leaving it in all the time. Most commercial operating systems have made
    the investment to correctly design tracing facilities so they are
    available. LTT in combination with relayfs could fulfill that role for
    Linux.

    Robert Wisniewski
    The K42 MP OS Project
    Advanced Operating Systems
    Scalable Parallel Systems
    IBM T.J. Watson Research Center
    914-945-3181
    http://www.research.ibm.com/K42/
    bob@watson.ibm.com
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  • Next message: Josh Boyer: "Re: Fw: signed kernel modules?"

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