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83d6c39310
Nadav correctly reports that we have a race between a worker exiting, and new work being queued. This can lead to work being queued behind an existing worker that could be sleeping on an event before it can run to completion, and hence introducing potential big latency gaps if we hit this race condition: cpu0 cpu1 ---- ---- io_wqe_worker() schedule_timeout() // timed out io_wqe_enqueue() io_wqe_wake_worker() // work_flags & IO_WQ_WORK_CONCURRENT io_wqe_activate_free_worker() io_worker_exit() Fix this by having the exiting worker go through the normal decrement of a running worker, which will spawn a new one if needed. The free worker activation is modified to only return success if we were able to find a sleeping worker - if not, we keep looking through the list. If we fail, we create a new worker as per usual. Cc: stable@vger.kernel.org Link: https://lore.kernel.org/io-uring/BFF746C0-FEDE-4646-A253-3021C57C26C9@gmail.com/ Reported-by: Nadav Amit <nadav.amit@gmail.com> Tested-by: Nadav Amit <nadav.amit@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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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.