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    SubjectRe: [PATCH] Give kjournald a IOPRIO_CLASS_RT io priority
    On Thu, 2 Oct 2008 09:46:59 -0400
    Theodore Tso <tytso@mit.edu> wrote:

    > On Thu, Oct 02, 2008 at 06:16:29AM -0700, Arjan van de Ven wrote:
    > > On Thu, 2 Oct 2008 08:04:44 -0400
    > > Theodore Tso <tytso@mit.edu> wrote:
    > >
    > > >
    > > > > But sometimes that doesn't work (including the place where I
    > > > > knowingly broke it). If we can find and fix the offending
    > > > > piece of jbd logic (a big if) then all is peachy.
    > > >
    > > > Do we have workloads that can easily demonstrate this problem?
    > > > If so, we can add some tracing code which will allow us to see
    > > > which theory is correct, and what is actually happening.
    > >
    > > I can very easily reproduce it; my mail client (claws) stalls due to
    > > this several seconds at least once every 5 to 10 minutes...
    > > (usually when I'm typing an email.. grumble)
    >
    > Are you running with noatime or relatime?

    yes; I have

    mount -o remount,relatime / &
    for i in `pidof kjournald` ; do ionice -c1 -p $i ; done

    in my /etc/rc.local


    > One quick thing to try that might show what is going on is to run
    > debugfs on the device where your mail directory is located, while
    > claws is running, and then use the debugfs command "logdump -a" to
    > dump out the contents of the journal. You can then use ncheck and
    > icheck to take the FS block numbers from logdump and translate them to
    > inode numbers, and then from inode numbers to pathnames. That might
    > give us some insight as to what is going on.

    I'll try (sadly I'm in a training session all day today so I might not
    get to it quickly)

    > I can whip up a patch which adds some markers which we could use to
    > find out more information about what is happening.

    interesting testcase of the markers concept.


    --
    Arjan van de Ven Intel Open Source Technology Centre
    For development, discussion and tips for power savings,
    visit http://www.lesswatts.org


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