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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 <> 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,

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