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lustre has a "Pinger" kthread which periodically pings peers to ensure all hosts are functioning. This can more easily be done using a work queue. As maintaining contact with other peers is import for keeping the filesystem running, and as the filesystem might be involved in freeing memory, it is safest to have a separate WQ_MEM_RECLAIM workqueue. The SVC_EVENT functionality to wake up the thread can be replaced with mod_delayed_work(). Also use round_jiffies_up_relative() rather than setting a minimum of 1 second delay. The PING_INTERVAL is measured in seconds so this meets the need is allow the workqueue to keep wakeups synchronized. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.