linux/Documentation/cpuidle, branch v3.5Linux kernel source treehttps://git.amat.us/linux/atom/Documentation/cpuidle?h=v3.52012-03-30T05:52:58Zcpuidle: add a sysfs entry to disable specific C state for debug purpose.2012-03-30T05:52:58ZShuoX Liushuox.liu@intel.com2012-03-28T22:19:11Zurn:sha1:3a53396b0381ec9d5180fd8fe7a681c8ce95fd9a
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>
cpuidle: Add Documentation2008-02-14T05:16:13ZVenkatesh Pallipadivenkatesh.pallipadi@intel.com2008-02-14T05:16:13Zurn:sha1:fe8e288a63f2f3c51c288500282d0eb5cd26a534
Documentation for cpuidle infrastructure. (resend)
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Len Brown <len.brown@intel.com>