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When an io-wq worker goes to sleep, it checks if there's work to do. If there is, it'll create a new worker. But if this worker is currently idle, it'll either get woken right back up immediately, or someone else has already created the necessary worker to handle this work. Only go through the worker creation logic if the current worker is currently handling a work item. That means it's being scheduled out as part of handling that work, not just going to sleep on its own. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.