From 73e75b416ffcfa3a84952d8e389a0eca080f00e1 Mon Sep 17 00:00:00 2001 From: Hollis Blanchard Date: Tue, 2 Dec 2008 15:51:57 -0600 Subject: KVM: ppc: Implement in-kernel exit timing statistics Existing KVM statistics are either just counters (kvm_stat) reported for KVM generally or trace based aproaches like kvm_trace. For KVM on powerpc we had the need to track the timings of the different exit types. While this could be achieved parsing data created with a kvm_trace extension this adds too much overhead (at least on embedded PowerPC) slowing down the workloads we wanted to measure. Therefore this patch adds a in-kernel exit timing statistic to the powerpc kvm code. These statistic is available per vm&vcpu under the kvm debugfs directory. As this statistic is low, but still some overhead it can be enabled via a .config entry and should be off by default. Since this patch touched all powerpc kvm_stat code anyway this code is now merged and simplified together with the exit timing statistic code (still working with exit timing disabled in .config). Signed-off-by: Christian Ehrhardt Signed-off-by: Hollis Blanchard Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_host.h | 56 +++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) (limited to 'arch/powerpc/include/asm') diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index a4a7d5ef6cf..2f5b49f2a98 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -71,6 +71,49 @@ struct kvmppc_44x_tlbe { u32 word2; }; +enum kvm_exit_types { + MMIO_EXITS, + DCR_EXITS, + SIGNAL_EXITS, + ITLB_REAL_MISS_EXITS, + ITLB_VIRT_MISS_EXITS, + DTLB_REAL_MISS_EXITS, + DTLB_VIRT_MISS_EXITS, + SYSCALL_EXITS, + ISI_EXITS, + DSI_EXITS, + EMULATED_INST_EXITS, + EMULATED_MTMSRWE_EXITS, + EMULATED_WRTEE_EXITS, + EMULATED_MTSPR_EXITS, + EMULATED_MFSPR_EXITS, + EMULATED_MTMSR_EXITS, + EMULATED_MFMSR_EXITS, + EMULATED_TLBSX_EXITS, + EMULATED_TLBWE_EXITS, + EMULATED_RFI_EXITS, + DEC_EXITS, + EXT_INTR_EXITS, + HALT_WAKEUP, + USR_PR_INST, + FP_UNAVAIL, + DEBUG_EXITS, + TIMEINGUEST, + __NUMBER_OF_KVM_EXIT_TYPES +}; + +#ifdef CONFIG_KVM_EXIT_TIMING +/* allow access to big endian 32bit upper/lower parts and 64bit var */ +struct exit_timing { + union { + u64 tv64; + struct { + u32 tbu, tbl; + } tv32; + }; +}; +#endif + struct kvm_arch { }; @@ -130,6 +173,19 @@ struct kvm_vcpu_arch { u32 dbcr0; u32 dbcr1; +#ifdef CONFIG_KVM_EXIT_TIMING + struct exit_timing timing_exit; + struct exit_timing timing_last_enter; + u32 last_exit_type; + u32 timing_count_type[__NUMBER_OF_KVM_EXIT_TYPES]; + u64 timing_sum_duration[__NUMBER_OF_KVM_EXIT_TYPES]; + u64 timing_sum_quad_duration[__NUMBER_OF_KVM_EXIT_TYPES]; + u64 timing_min_duration[__NUMBER_OF_KVM_EXIT_TYPES]; + u64 timing_max_duration[__NUMBER_OF_KVM_EXIT_TYPES]; + u64 timing_last_exit; + struct dentry *debugfs_exit_timing; +#endif + u32 last_inst; ulong fault_dear; ulong fault_esr; -- cgit v1.2.2