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authorMark Langsdorf <mark.langsdorf@amd.com>2009-10-06 15:25:02 -0400
committerAvi Kivity <avi@redhat.com>2009-12-03 02:32:17 -0500
commit565d0998ecac8373b9a9ecd5991abe74318cd235 (patch)
tree92b0964145a4e2cd7400eda3a9a8cb83eaa4ab33 /arch/x86/include/asm/svm.h
parent4b8d54f9726f1159330201c5ed2ea30bce7e63ea (diff)
KVM: SVM: Support Pause Filter in AMD processors
New AMD processors (Family 0x10 models 8+) support the Pause Filter Feature. This feature creates a new field in the VMCB called Pause Filter Count. If Pause Filter Count is greater than 0 and intercepting PAUSEs is enabled, the processor will increment an internal counter when a PAUSE instruction occurs instead of intercepting. When the internal counter reaches the Pause Filter Count value, a PAUSE intercept will occur. This feature can be used to detect contended spinlocks, especially when the lock holding VCPU is not scheduled. Rescheduling another VCPU prevents the VCPU seeking the lock from wasting its quantum by spinning idly. Experimental results show that most spinlocks are held for less than 1000 PAUSE cycles or more than a few thousand. Default the Pause Filter Counter to 3000 to detect the contended spinlocks. Processor support for this feature is indicated by a CPUID bit. On a 24 core system running 4 guests each with 16 VCPUs, this patch improved overall performance of each guest's 32 job kernbench by approximately 3-5% when combined with a scheduler algorithm thati caused the VCPU to sleep for a brief period. Further performance improvement may be possible with a more sophisticated yield algorithm. Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/svm.h')
-rw-r--r--arch/x86/include/asm/svm.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 85574b7c1bc1..1fecb7e61130 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -57,7 +57,8 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
57 u16 intercept_dr_write; 57 u16 intercept_dr_write;
58 u32 intercept_exceptions; 58 u32 intercept_exceptions;
59 u64 intercept; 59 u64 intercept;
60 u8 reserved_1[44]; 60 u8 reserved_1[42];
61 u16 pause_filter_count;
61 u64 iopm_base_pa; 62 u64 iopm_base_pa;
62 u64 msrpm_base_pa; 63 u64 msrpm_base_pa;
63 u64 tsc_offset; 64 u64 tsc_offset;