9fbb303ec9
Legacy resctrl monitor files must provide the sum of event values across all Sub-NUMA Cluster (SNC) domains that share an L3 cache instance. There are now two cases: 1) A specific domain is provided in struct rmid_read This is either a non-SNC system, or the request is to read data from just one SNC node. 2) Domain pointer is NULL. In this case the cacheinfo field in struct rmid_read indicates that all SNC nodes that share that L3 cache instance should have the event read and return the sum of all values. Update the CPU sanity check. The existing check that an event is read from a CPU in the requested domain still applies when reading a single domain. But when summing across domains a more relaxed check that the current CPU is in the scope of the L3 cache instance is appropriate since the MSRs to read events are scoped at L3 cache level. Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Tested-by: Babu Moger <babu.moger@amd.com> Link: https://lore.kernel.org/r/20240628215619.76401-17-tony.luck@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 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.