Re: [PATCH] arch/ia64/sn: SGI Altix hardware performance monitoring API

[Christoph Hellwig <hch@infradead.org>]

On Fri, Sep 10, 2004 at 05:05:31PM +1000, Mark Goodwin wrote:
> 
> 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.
> 
> Any review/comments most welcome ..  thanks

What tools are using this?  Might be worse to put an url to the source
package into the Kconfig entry.