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authorVenki Pallipadi <venkatesh.pallipadi@intel.com>2008-02-29 10:24:32 -0800
committerLen Brown <len.brown@intel.com>2008-03-26 00:58:19 -0400
commit8e92b6605da989c0aa8ff7e33306f36f0efd957c (patch)
treeaafbc4628b907f4134ad91db9b160941f246dfcf /include
parent8b78cf602fd3bd97c0080edd22fe8fd5d0fa7832 (diff)
cpuidle: fix 100% C0 statistics regression
commit 9b12e18cdc1553de62d931e73443c806347cd974 'ACPI: cpuidle: Support C1 idle time accounting' was implicated in a 100% C0 idle regression. http://bugzilla.kernel.org/show_bug.cgi?id=10076 It pointed out a potential problem where the menu governor may get confused by the C-state residency time from poll idle or C1 idle, where this timing info is not accurate. This inaccuracy is due to interrupts being handled before we account for C-state exit. Do not mark TIME_VALID for CO poll state. Mark C1 time as valid only with the MWAIT (CSTATE_FFH) entry method. This makes governors use the timing information only when it is correct and eliminates any wrong policy decisions that may result from invalid timing information. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
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