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0219a3528d
Checking need_more_worker() and calling wake_up_worker() is a repeated pattern. Let's add kick_pool(), which checks need_more_worker() and open-code wake_up_worker(), and replace wake_up_worker() uses. The following conversions aren't one-to-one: * __queue_work() was using __need_more_work() because it knows that pool->worklist isn't empty. Switching to kick_pool() adds an extra list_empty() test. * create_worker() always needs to wake up the newly minted worker whether there's more work to do or not to avoid triggering hung task check on the new task. Keep the current wake_up_process() and still add kick_pool(). This may lead to an extra wakeup which isn't harmful. * pwq_adjust_max_active() was explicitly checking whether it needs to wake up a worker or not to avoid spurious wakeups. As kick_pool() only wakes up a worker when necessary, this explicit check is no longer necessary and dropped. * unbind_workers() now calls kick_pool() instead of wake_up_worker() adding a need_more_worker() test. This avoids spurious wakeups and shouldn't break anything. wake_up_worker() is dropped as kick_pool() replaces all its users. After this patch, all paths that wakes up a non-rescuer worker to initiate work item execution use kick_pool(). This will enable future changes to improve locality. Signed-off-by: Tejun Heo <tj@kernel.org> |
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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 Restructured Text 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.