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Li RongQing authored
When a KVM guest has MWAIT, mwait_idle() is used as the default idle function. However, the cpuidle-haltpoll driver calls default_idle() from default_enter_idle() directly and that one uses HLT instead of MWAIT, which may affect performance adversely, because MWAIT is preferred to HLT as explained by the changelog of commit aebef63c ("x86: Remove vendor checks from prefer_mwait_c1_over_halt"). Make default_enter_idle() call arch_cpu_idle(), which can use MWAIT, instead of default_idle() to address this issue. Suggested-by:
Thomas Gleixner <tglx@linutronix.de> Suggested-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
Li RongQing <lirongqing@baidu.com> [ rjw: Changelog rewrite ] Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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