diff options
| author | ShuoX Liu <shuox.liu@intel.com> | 2012-03-28 15:19:11 -0700 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2012-03-30 01:52:58 -0400 |
| commit | 3a53396b0381ec9d5180fd8fe7a681c8ce95fd9a (patch) | |
| tree | 60a0770554c64250900ccf827ff868b483ae92fe /include | |
| parent | 6a6ea0acc9375571a13aa8c4e105a0807e1c16a4 (diff) | |
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cpuidle.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 927db28a2a4c..ca4e4983773f 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -46,6 +46,7 @@ struct cpuidle_state { unsigned int exit_latency; /* in US */ unsigned int power_usage; /* in mW */ unsigned int target_residency; /* in US */ + unsigned int disable; int (*enter) (struct cpuidle_device *dev, struct cpuidle_driver *drv, |