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Kthreads are currently implemented as an infinite loop. Each has its own variant of checks for terminating, freezing, awakening. In many cases it is unclear to say in which state it is and sometimes it is done a wrong way. The plan is to convert kthreads into kthread_worker or workqueues API. It allows to split the functionality into separate operations. It helps to make a better structure. Also it defines a clean state where no locks are taken, IRQs blocked, the kthread might sleep or even be safely migrated. The kthread worker API is useful when we want to have a dedicated single thread for the work. It helps to make sure that it is available when needed. Also it allows a better control, e.g. define a scheduling priority. This patch converts the frm_pool kthread into the kthread worker API because I am not sure how busy the thread is. It is well possible that it does not need a dedicated kthread and workqueues would be perfectly fine. Well, the conversion between kthread worker API and workqueues is pretty trivial. The patch moves one iteration from the kthread into the work function. It is queued only when there is a pending work. Therefore we do not need to compare flush_ser and req_ser at the beginning. On the contrary, the same work could be queued only once at a time. Therefore it has to re-queue itself if some requests are pending. Otherwise, wake_up_process() is replaced by queuing the work. Important: The change is only compile tested. I did not find an easy way how to check it in a real life. Signed-off-by: Petr Mladek <pmladek@suse.com> TO: Doug Ledford <dledford@redhat.com> CC: Sean Hefty <sean.hefty@intel.com> CC: Hal Rosenstock <hal.rosenstock@gmail.com> CC: linux-rdma@vger.kernel.org Signed-off-by: Doug Ledford <dledford@redhat.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.