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RINGBUF_TYPE_TIME_STAMP is defined but not used, and from what I can gather was reserved for something like an absolute timestamp feature for the ring buffer, if not a complete replacement of the current time_delta scheme. This code redefines RINGBUF_TYPE_TIME_STAMP to implement absolute time stamps. Another way to look at it is that it essentially forces extended time_deltas for all events. The motivation for doing this is to enable time_deltas that aren't dependent on previous events in the ring buffer, making it feasible to use the ring_buffer_event timetamps in a more random-access way, for purposes other than serial event printing. To set/reset this mode, use tracing_set_timestamp_abs() from the previous interface patch. Link: http://lkml.kernel.org/r/477b362dba1ce7fab9889a1a8e885a62c472f041.1516069914.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> 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.