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    SubjectRe: [PATCH] hrtimers: Special-case zero length sleeps
    On Wed, Feb 15, 2012 at 08:47:57PM +0000, Matthew Garrett wrote:

    > Ok. I'll work on finding how prevelant it is and see if we can kill it
    > off in userspace.

    Checking through an exploded Fedora kernel tree suggests around 125
    packages out of 11000 or so, so around 1% of userspace seems to use
    sleep(0) under certain circumstances. We can probably fix everything in
    the distribution, but that suggests that there's also going to be a
    significant amount of code in the outside world that's also broken.

    Userspace clearly has an expectation that sleep(0) is magic in some
    ill-defined way. We'd be well within our rights to break that
    expectation, but I think it's common enough to warrant special casing.

    Matthew Garrett |

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