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Currently the call_rcu_tasks() kthread is created upon first invocation of call_rcu_tasks(). This has the advantage of avoiding creation if there are never any invocations of call_rcu_tasks() and of synchronize_rcu_tasks(), but it requires an unreliable heuristic to determine when it is safe to create the kthread. For example, it is not safe to create the kthread when call_rcu_tasks() is invoked with a spinlock held, but there is no good way to detect this in !PREEMPT kernels. This commit therefore creates this kthread unconditionally at core_initcall() time. If you don't want this kthread created, then build with CONFIG_TASKS_RCU=n. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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| README | ||
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.