73e75b416f
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 <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License, version 2, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* Copyright IBM Corp. 2008
|
|
*
|
|
* Authors: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#ifndef __POWERPC_KVM_EXITTIMING_H__
|
|
#define __POWERPC_KVM_EXITTIMING_H__
|
|
|
|
#include <linux/kvm_host.h>
|
|
#include <asm/kvm_host.h>
|
|
|
|
#ifdef CONFIG_KVM_EXIT_TIMING
|
|
void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu);
|
|
void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu);
|
|
void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id);
|
|
void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu);
|
|
|
|
static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type)
|
|
{
|
|
vcpu->arch.last_exit_type = type;
|
|
}
|
|
|
|
#else
|
|
/* if exit timing is not configured there is no need to build the c file */
|
|
static inline void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu) {}
|
|
static inline void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu) {}
|
|
static inline void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu,
|
|
unsigned int id) {}
|
|
static inline void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu) {}
|
|
static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type) {}
|
|
#endif /* CONFIG_KVM_EXIT_TIMING */
|
|
|
|
/* account the exit in kvm_stats */
|
|
static inline void account_exit_stat(struct kvm_vcpu *vcpu, int type)
|
|
{
|
|
/* type has to be known at build time for optimization */
|
|
BUILD_BUG_ON(__builtin_constant_p(type));
|
|
switch (type) {
|
|
case EXT_INTR_EXITS:
|
|
vcpu->stat.ext_intr_exits++;
|
|
break;
|
|
case DEC_EXITS:
|
|
vcpu->stat.dec_exits++;
|
|
break;
|
|
case EMULATED_INST_EXITS:
|
|
vcpu->stat.emulated_inst_exits++;
|
|
break;
|
|
case DCR_EXITS:
|
|
vcpu->stat.dcr_exits++;
|
|
break;
|
|
case DSI_EXITS:
|
|
vcpu->stat.dsi_exits++;
|
|
break;
|
|
case ISI_EXITS:
|
|
vcpu->stat.isi_exits++;
|
|
break;
|
|
case SYSCALL_EXITS:
|
|
vcpu->stat.syscall_exits++;
|
|
break;
|
|
case DTLB_REAL_MISS_EXITS:
|
|
vcpu->stat.dtlb_real_miss_exits++;
|
|
break;
|
|
case DTLB_VIRT_MISS_EXITS:
|
|
vcpu->stat.dtlb_virt_miss_exits++;
|
|
break;
|
|
case MMIO_EXITS:
|
|
vcpu->stat.mmio_exits++;
|
|
break;
|
|
case ITLB_REAL_MISS_EXITS:
|
|
vcpu->stat.itlb_real_miss_exits++;
|
|
break;
|
|
case ITLB_VIRT_MISS_EXITS:
|
|
vcpu->stat.itlb_virt_miss_exits++;
|
|
break;
|
|
case SIGNAL_EXITS:
|
|
vcpu->stat.signal_exits++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* wrapper to set exit time and account for it in kvm_stats */
|
|
static inline void account_exit(struct kvm_vcpu *vcpu, int type)
|
|
{
|
|
kvmppc_set_exit_type(vcpu, type);
|
|
account_exit_stat(vcpu, type);
|
|
}
|
|
|
|
#endif /* __POWERPC_KVM_EXITTIMING_H__ */
|