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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-03-13 20:06:57 -0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-03-20 15:31:38 -0400
commit48cdd8287f47a3cdad5b9273a5ef81bf605f7826 (patch)
tree54fe14de42d138d232af36d4374d49fa4ef8dd10 /arch/x86/xen
parent448c8b1d07d5342922567e138a4b0108a42c24fb (diff)
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. Acked-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [v2: Fix compile error spotted by Benjamin Schweikert <b.schweikert@googlemail.com>]
Diffstat (limited to 'arch/x86/xen')
-rw-r--r--arch/x86/xen/setup.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 12366238d07d..1ba8dff26753 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -10,6 +10,7 @@
#include <linux/pm.h>
#include <linux/memblock.h>
#include <linux/cpuidle.h>
+#include <linux/cpufreq.h>
#include <asm/elf.h>
#include <asm/vdso.h>
@@ -420,6 +421,7 @@ void __init xen_arch_setup(void)
boot_cpu_data.hlt_works_ok = 1;
#endif
disable_cpuidle();
+ disable_cpufreq();
WARN_ON(set_pm_idle_to_default());
fiddle_vdso();
}