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    SubjectRe: [GIT PATCH] TTY patches for 2.6.33-git
    On Mon, 14 Dec 2009 11:39:48 +0100
    Oliver Neukum <oliver@neukum.org> wrote:

    > Am Montag, 14. Dezember 2009 06:30:15 schrieb Arjan van de Ven:
    > > > We have the bkl tracepoints for that, attaching an example below,
    > > > blkdev_get/bkldev_put is among the highest consumer for me.
    > >
    > > we have a trace, but not a number that anyone can just pull out
    > > without having to go through great lengths to set stuff up... (esp
    > > to capture a boot)...
    > > Adding a counter always to the lock_kernel function should be fine
    > > instead...
    >
    > But don't we need to know how long it is held? If you just count
    > you'll make code that drops it while it can look bad.

    I think/hope we're well past that. At this point, just the act of taking
    it at all is bad.


    --
    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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