[IA64] SGI Altix hardware performance monitoring API
The SGI Altix PROM supports a SAL call for performance monitoring and for exporting NUMA topology. We need this in community kernels for diagnostic and performance tools to use, especially on very large machines. This patch registers a dynamic misc device "sn_hwperf" that supports an ioctl interface for reading/writing memory mapped registers on Altix nodes and routers via the new SAL call. It also creates a read-only procfs file "/proc/sgi_sn/sn_topology" to export NUMA topology and Altix hardware inventory. > What tools are using this? Performance Co-Pilot http://oss.sgi.com/projects/pcp in particular, pmshub, shubstats and linkstat. Numerous other users include anything that needs knowledge of numa topology/interconnect in order to perform well, e.g. mpt. BTW I have not exported any API functions .. at this point I don't think we need any modules to call the API. Signed-off-by: Mark Goodwin <markgw@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
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