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c5b15ddf11
By default, CMN has automatic clock-gating with the implication that a DTC's cycle counter may not increment while the DTC is sufficiently idle. Given that we may have up to 4 DTCs to choose from when scheduling a cycles event, this may potentially lead to surprising results if trying to measure metrics based on activity in a different DTC domain from where cycles end up being counted. Furthermore, since the details of internal clock gating are not documented, we can't even reason about what "active" cycles for a DTC actually mean relative to the activity of other nodes within the same nominal DTC domain. Make the reasonable assumption that if the user wants to count cycles, they almost certainly want to count all of the cycles, and disable clock gating while a DTC's cycle counter is in use. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/c47cfdc09e907b1d7753d142a7e659982cceb246.1725296395.git.robin.murphy@arm.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 reStructuredText 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.