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Message-Id: <1331680720-18268-3-git-send-email-konrad.wilk@oracle.com> Date: Tue, 13 Mar 2012 19:18:40 -0400 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> To: davej@...hat.com, cpufreq@...r.kernel.org, linux-kernel@...r.kernel.org, JBeulich@...e.com Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Subject: [PATCH 2/2] xen/cpufreq: Disable the cpu frequency scaling drivers from loading. By using the functionality provided by "[CPUFREQ]: provide disable_cpuidle() function to disable the API." Under the Xen hypervisor we do not want the initial domain to exercise the cpufreq scaling drivers. This is b/c the Xen hypervisor is in charge of doing this as well and we can end up with both the Linux kernel and the hypervisor trying to change the P-states leading to weird performance issues. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> --- arch/x86/xen/setup.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index e03c636..4461e0a 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -420,6 +420,7 @@ void __init xen_arch_setup(void) boot_cpu_data.hlt_works_ok = 1; #endif disable_cpuidle(); + disable_cpufreq(); boot_option_idle_override = IDLE_HALT; WARN_ON(set_pm_idle_to_default()); fiddle_vdso(); -- 1.7.9.48.g85da4d -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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