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Revision 3a53396b0381ec9d5180fd8fe7a681c8ce95fd9a authored by ShuoX Liu on 28 March 2012, 22:19:11 UTC, committed by Len Brown on 30 March 2012, 05:52:58 UTC 
cpuidle: add a sysfs entry to disable specific C state for debug purpose.
 
Some C states of new CPU might be not good.  One reason is BIOS might
configure them incorrectly.  To help developers root cause it quickly, the
patch adds a new sysfs entry, so developers could disable specific C state
manually.

In addition, C state might have much impact on performance tuning, as it
takes much time to enter/exit C states, which might delay interrupt
processing.  With the new debug option, developers could check if a deep C
state could impact performance and how much impact it could cause.

Also add this option in Documentation/cpuidle/sysfs.txt.

[akpm@linux-foundation.org: check kstrtol return value]
Signed-off-by: ShuoX Liu <shuox.liu@intel.com>
Reviewed-by: Yanmin Zhang <yanmin_zhang@intel.com>
Reviewed-and-Tested-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
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README.txt 
		       ================================
		       Fujitsu FR-V LINUX DOCUMENTATION
		       ================================

This directory contains documentation for the Fujitsu FR-V CPU architecture
port of Linux.

The following documents are available:

 (*) features.txt

     A description of the basic features inherent in this architecture port.


 (*) configuring.txt

     A summary of the configuration options particular to this architecture.


 (*) booting.txt

     A description of how to boot the kernel image and a summary of the kernel
     command line options.


 (*) gdbstub.txt

     A description of how to debug the kernel using GDB attached by serial
     port, and a summary of the services available.


 (*) mmu-layout.txt

     A description of the virtual and physical memory layout used in the
     MMU linux kernel, and the registers used to support it.


 (*) gdbinit

     An example .gdbinit file for use with GDB. It includes macros for viewing
     MMU state on the FR451. See mmu-layout.txt for more information.


 (*) clock.txt

     A description of the CPU clock scaling interface.


 (*) atomic-ops.txt

     A description of how the FR-V kernel's atomic operations work.
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