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The new PEBS format 5 implies that the number of the fixed counters can be up to 16. The current INTEL_PMC_MAX_FIXED is still 4. If the current kernel runs on a future platform which has more than 4 fixed counters, a warning will be triggered. The number of the fixed counters will be clipped to 4. Users have to upgrade the kernel to access the new fixed counters. Add a new default constraint for PerfMon v5 and up, which can support up to 16 fixed counters. The pseudo-encoding is applied for the fixed counters 4 and later. The user can have generic support for the new fixed counters on the future platfroms without updating the kernel. Increase the INTEL_PMC_MAX_FIXED to 16. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Andi Kleen <ak@linux.intel.com> Link: https://lkml.kernel.org/r/1643750603-100733-3-git-send-email-kan.liang@linux.intel.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.