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The minimum interval specified the PMSIDR_EL1.Interval field is a hardware recommendation. However, this value is set by hardware designer before the production. It is not actual hardware limitation but tools currently have no way to test shorter periods. This change relaxes the limitation by allowing any non-zero periods, with simplifying code with clamp_t(). The downside is that small periods may increase the risk of AUX ring buffer overruns. When an overrun occurs, the perf core layer will trigger an irq work to disable the event and wake up the tool in user space to read the trace data. After the tool finishes reading, it will re-enable the AUX event. Signed-off-by: Leo Yan <leo.yan@arm.com> Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Link: https://lore.kernel.org/r/20250627163028.3503122-1-leo.yan@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.