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Platform specific PMU supports alternative event for some of the event codes. During perf_event_open, it any event group doesn't match constraint check criteria, further lookup is done to find alternative event. Code checks to see if it is possible to schedule event as group using alternative events. Testcase exercises the alternative event find code for power10. Example, Using PMC1 to PMC4 in a group and again trying to schedule PM_CYC_ALT (0x0001e) will fail since this exceeds number of programmable events in group. But since 0x600f4 is an alternative event for 0x0001e, it is possible to use 0x0001e in the group. Testcase uses such combination all events in power10 which has alternative event. Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220610134113.62991-28-atrajeev@linux.vnet.ibm.com |
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| README | ||
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.