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The ring-buffer code has recusion protection in case tracing ends up tracing itself, the ring-buffer will detect that it was called at the same context (normal, softirq, interrupt or NMI), and not continue to record the event. With the histogram synthetic events, they are called while tracing another event at the same context. The recusion protection triggers because it detects tracing at the same context and stops it. Add ring_buffer_nest_start() and ring_buffer_nest_end() that will notify the ring buffer that a trace is about to happen within another trace and that it is intended, and not to trigger the recursion blocking. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> |
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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.