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Introduce a PMU device named cpum_cf_diag. It extracts the values of all counters in all authorized counter sets and stores them as event raw data. This is done with the STORE CPU COUNTER MULTIPLE instruction to speed up access. All counter sets fit into one buffer. The values of each counter are taken when the event is started on the performance sub-system and when the event is stopped. This results in counter values available at the start and at the end of the measurement time frame. The difference is calculated for each counter. The differences of all counters are then saved as event raw data in the perf.data file. The counter values are accompanied by the time stamps when the counter set was started and when the counter set was stopped. This data is part of a trailer entry which describes the time frame, counter set version numbers, CPU speed, and machine type for later analysis. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.