Re: [PATCH diagnostic] Re: HPET regression in 2.6.26 versus 2.6.25 -- RCU problem - Kernel

This is a discussion on Re: [PATCH diagnostic] Re: HPET regression in 2.6.26 versus 2.6.25 -- RCU problem - Kernel ; > And attached is the kernel module I used to test the patch, for whatever > that might be worth. Thank you for that, too. I have some questions and a comment: 1. This module can only be loaded from ...

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Thread: Re: [PATCH diagnostic] Re: HPET regression in 2.6.26 versus 2.6.25 -- RCU problem

  1. Re: [PATCH diagnostic] Re: HPET regression in 2.6.26 versus 2.6.25 -- RCU problem




    > And attached is the kernel module I used to test the patch, for whatever
    > that might be worth.


    Thank you for that, too. I have some questions and a comment:

    1. This module can only be loaded from a working system, right? You
    mean that _you_ tested the kernel code on _your_ system to see if it
    was working correctly, and did not mean that I should use this with
    the problematic kernels on my system? I could easily run this with
    something like 'modprobe stall' on my working machine, or on the
    problem machine if I boot with the "hpet=disabled" parameter, but
    doing so would not help us find the problem, right?

    2. Coincidentally, I had started reading Understanding the Linux Kernel
    (first edition, 2000) about a week before I got socked with the kernel
    freeze issue. I was reading it at work -- I work as a tutor, and there
    are sometimes slow times without students to help -- but haven't had a
    chance to do so in the best 10 days while I've been struggling with my
    own kernel problem. It is also quite out-of-date -- published in 2000,
    and discussing the 2.2 kernel line. I know that there have been a
    couple of new editions since then, but I just happened to have this first
    edition on my shelf... so I took it into work for a little light reading.

    Anyway, I have a lot on my personal TODO list for the fall, but maybe
    early next year I will have a chance to play with the kernel for fun.
    When I do so, I will have your new, experimental module to look at...
    among tons of other things.


    Thanks,
    Dave W.
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  2. Re: [PATCH diagnostic] Re: HPET regression in 2.6.26 versus 2.6.25 -- RCU problem

    On Mon, Aug 11, 2008 at 09:22:01AM -0700, David Witbrodt wrote:
    >
    > > And attached is the kernel module I used to test the patch, for whatever
    > > that might be worth.

    >
    > Thank you for that, too. I have some questions and a comment:
    >
    > 1. This module can only be loaded from a working system, right? You
    > mean that _you_ tested the kernel code on _your_ system to see if it
    > was working correctly, and did not mean that I should use this with
    > the problematic kernels on my system? I could easily run this with
    > something like 'modprobe stall' on my working machine, or on the
    > problem machine if I boot with the "hpet=disabled" parameter, but
    > doing so would not help us find the problem, right?


    Yep. This module was intended strictly to allow me to debug the
    diagnostic code.

    > 2. Coincidentally, I had started reading Understanding the Linux Kernel
    > (first edition, 2000) about a week before I got socked with the kernel
    > freeze issue. I was reading it at work -- I work as a tutor, and there
    > are sometimes slow times without students to help -- but haven't had a
    > chance to do so in the best 10 days while I've been struggling with my
    > own kernel problem. It is also quite out-of-date -- published in 2000,
    > and discussing the 2.2 kernel line. I know that there have been a
    > couple of new editions since then, but I just happened to have this first
    > edition on my shelf... so I took it into work for a little light reading.
    >
    > Anyway, I have a lot on my personal TODO list for the fall, but maybe
    > early next year I will have a chance to play with the kernel for fun.
    > When I do so, I will have your new, experimental module to look at...
    > among tons of other things.


    Well, the stall module derives pretty directly from some example code
    in Corbet, Rubini, and Kroah-Hartman's "Linux Device Drivers" book. ;-)

    Thanx, Paul
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