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I noticed that if I use dd to read the set_ftrace_filter file that the first hash command is repeated. # cd /sys/kernel/debug/tracing # echo schedule > set_ftrace_filter # echo do_IRQ >> set_ftrace_filter # echo schedule:traceoff >> set_ftrace_filter # echo do_IRQ:traceoff >> set_ftrace_filter # cat set_ftrace_filter schedule do_IRQ schedule:traceoff:unlimited do_IRQ:traceoff:unlimited # dd if=set_ftrace_filter bs=1 schedule do_IRQ schedule:traceoff:unlimited schedule:traceoff:unlimited do_IRQ:traceoff:unlimited 98+0 records in 98+0 records out 98 bytes copied, 0.00265011 s, 37.0 kB/s This is due to the way t_start() calls t_next() as well as the seq_file calls t_next() and the state is slightly different between the two. Namely, t_start() will call t_next() with a local "pos" variable. By separating out the function listing from t_next() into its own function, we can have better control of outputting the functions and the hash of triggers. This simplifies the code. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.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.