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    From
    SubjectRe: [OP] v2.6.22.22-op1
    Date
    <oliver@zipernowsky.hu> writes:

    > I announced the v2.6.22.22-op1 "stable" kernel.

    > fs/aio.c | 23 ++++++++++++-----------

    > Jeff Moyer (1):
    > aio: account I/O wait time properly

    This version of the patch introduced a regression for UML. It was
    seeing 100% iowait time when it wasn't waiting on any I/O. There was a
    follow-up patch which did the io_schedule conditionally, see commit id:

    e00ba3dae077f54cfd2af42e939a618caa7a3bca

    Cheers,

    Jeff

    > diff --git a/fs/aio.c b/fs/aio.c
    > index dbe699e..b3419c5 100644
    > --- a/fs/aio.c
    > +++ b/fs/aio.c
    > @@ -1170,7 +1171,7 @@ retry:
    > ret = 0;
    > if (to.timed_out) /* Only check after read evt */
    > break;
    > - schedule();
    > + io_schedule();
    > if (signal_pending(tsk)) {
    > ret = -EINTR;
    > break;


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