x86/uv: Implement UV BAU runtime enable and disable control via /proc/sgi_uv/

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This patch enables the BAU to be turned on or off dynamically.

  echo "on"  > /proc/sgi_uv/ptc_statistics
  echo "off" > /proc/sgi_uv/ptc_statistics

The system may be booted with or without the nobau option.

Whether the system currently has the BAU off can be seen in
the /proc file -- normally with the baustats script.
Each cpu will have a 1 in the bauoff field if the BAU was turned
off, so baustats will give a count of cpus that have it off.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Link: http://lkml.kernel.org/r/20120622131330.GB31884@sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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Cliff Wickman 2012-06-22 08:13:30 -05:00 • committed by Ingo Molnar

parent 11cab711f6

commit 26ef85770c

2 changed files with 63 additions and 15 deletions

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arch/x86/include/asm/uv/uv_bau.h

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76

arch/x86/platform/uv/tlb_uv.c

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