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CN10k DSS h/w perfmon does not support event overflow interrupt, so periodic timer is being used. Each event counter is 48bit, which in worst case scenario can increment at maximum 5.6 GT/s. At this rate it may take many hours to overflow these counters. Therefore polling period for overflow is set to 100 sec, which can be changed using sysfs parameter. Two fixed event counters starts counting from zero on overflow, so overflow condition is when new count less than previous count. While eight programmable event counters freezes at maximum value. Also individual counter cannot be restarted, so need to restart all eight counters. Signed-off-by: Bharat Bhushan <bbhushan2@marvell.com> Reviewed-by: Bhaskara Budiredla <bbudiredla@marvell.com> Link: https://lore.kernel.org/r/20220211045346.17894-4-bbhushan2@marvell.com Signed-off-by: Will Deacon <will@kernel.org>
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.