/* * 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: Hollis Blanchard * Christian Ehrhardt */ #include #include #include #include #include #include #include #include #include "timing.h" void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu) { int i; /* Take a lock to avoid concurrent updates */ mutex_lock(&vcpu->arch.exit_timing_lock); vcpu->arch.last_exit_type = 0xDEAD; for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) { vcpu->arch.timing_count_type[i] = 0; vcpu->arch.timing_max_duration[i] = 0; vcpu->arch.timing_min_duration[i] = 0xFFFFFFFF; vcpu->arch.timing_sum_duration[i] = 0; vcpu->arch.timing_sum_quad_duration[i] = 0; } vcpu->arch.timing_last_exit = 0; vcpu->arch.timing_exit.tv64 = 0; vcpu->arch.timing_last_enter.tv64 = 0; mutex_unlock(&vcpu->arch.exit_timing_lock); } static void add_exit_timing(struct kvm_vcpu *vcpu, u64 duration, int type) { u64 old; mutex_lock(&vcpu->arch.exit_timing_lock); vcpu->arch.timing_count_type[type]++; /* sum */ old = vcpu->arch.timing_sum_duration[type]; vcpu->arch.timing_sum_duration[type] += duration; if (unlikely(old > vcpu->arch.timing_sum_duration[type])) { printk(KERN_ERR"%s - wrap adding sum of durations" " old %lld new %lld type %d exit # of type %d\n", __func__, old, vcpu->arch.timing_sum_duration[type], type, vcpu->arch.timing_count_type[type]); } /* square sum */ old = vcpu->arch.timing_sum_quad_duration[type]; vcpu->arch.timing_sum_quad_duration[type] += (duration*duration); if (unlikely(old > vcpu->arch.timing_sum_quad_duration[type])) { printk(KERN_ERR"%s - wrap adding sum of squared durations" " old %lld new %lld type %d exit # of type %d\n", __func__, old, vcpu->arch.timing_sum_quad_duration[type], type, vcpu->arch.timing_count_type[type]); } /* set min/max */ if (unlikely(duration < vcpu->arch.timing_min_duration[type])) vcpu->arch.timing_min_duration[type] = duration; if (unlikely(duration > vcpu->arch.timing_max_duration[type])) vcpu->arch.timing_max_duration[type] = duration; mutex_unlock(&vcpu->arch.exit_timing_lock); } void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu) { u64 exit = vcpu->arch.timing_last_exit; u64 enter = vcpu->arch.timing_last_enter.tv64; /* save exit time, used next exit when the reenter time is known */ vcpu->arch.timing_last_exit = vcpu->arch.timing_exit.tv64; if (unlikely(vcpu->arch.last_exit_type == 0xDEAD || exit == 0)) return; /* skip incomplete cycle (e.g. after reset) */ /* update statistics for average and standard deviation */ add_exit_timing(vcpu, (enter - exit), vcpu->arch.last_exit_type); /* enter -> timing_last_exit is time spent in guest - log this too */ add_exit_timing(vcpu, (vcpu->arch.timing_last_exit - enter), TIMEINGUEST); } static const char *kvm_exit_names[__NUMBER_OF_KVM_EXIT_TYPES] = { [MMIO_EXITS] = "MMIO", [SIGNAL_EXITS] = "SIGNAL", [ITLB_REAL_MISS_EXITS] = "ITLBREAL", [ITLB_VIRT_MISS_EXITS] = "ITLBVIRT", [DTLB_REAL_MISS_EXITS] = "DTLBREAL", [DTLB_VIRT_MISS_EXITS] = "DTLBVIRT", [SYSCALL_EXITS] = "SYSCALL", [ISI_EXITS] = "ISI", [DSI_EXITS] = "DSI", [EMULATED_INST_EXITS] = "EMULINST", [EMULATED_MTMSRWE_EXITS] = "EMUL_WAIT", [EMULATED_WRTEE_EXITS] = "EMUL_WRTEE", [EMULATED_MTSPR_EXITS] = "EMUL_MTSPR", [EMULATED_MFSPR_EXITS] = "EMUL_MFSPR", [EMULATED_MTMSR_EXITS] = "EMUL_MTMSR", [EMULATED_MFMSR_EXITS] = "EMUL_MFMSR", [EMULATED_TLBSX_EXITS] = "EMUL_TLBSX", [EMULATED_TLBWE_EXITS] = "EMUL_TLBWE", [EMULATED_RFI_EXITS] = "EMUL_RFI", [DEC_EXITS] = "DEC", [EXT_INTR_EXITS] = "EXTINT", [HALT_WAKEUP] = "HALT", [USR_PR_INST] = "USR_PR_INST", [FP_UNAVAIL] = "FP_UNAVAIL", [DEBUG_EXITS] = "DEBUG", [TIMEINGUEST] = "TIMEINGUEST" }; static int kvmppc_exit_timing_show(struct seq_file *m, void *private) { struct kvm_vcpu *vcpu = m->private; int i; u64 min, max, sum, sum_quad; seq_printf(m, "%s", "type count min max sum sum_squared\n"); for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) { min = vcpu->arch.timing_min_duration[i]; do_div(min, tb_ticks_per_usec); max = vcpu->arch.timing_max_duration[i]; do_div(max, tb_ticks_per_usec); sum = vcpu->arch.timing_sum_duration[i]; do_div(sum, tb_ticks_per_usec); sum_quad = vcpu->arch.timing_sum_quad_duration[i]; do_div(sum_quad, tb_ticks_per_usec); seq_printf(m, "%12s %10d %10lld %10lld %20lld %20lld\n", kvm_exit_names[i], vcpu->arch.timing_count_type[i], min, max, sum, sum_quad); } return 0; } /* Write 'c' to clear the timing statistics. */ static ssize_t kvmppc_exit_timing_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { int err = -EINVAL; char c; if (count > 1) { goto done; } if (get_user(c, user_buf)) { err = -EFAULT; goto done; } if (c == 'c') { struct seq_file *seqf = file->private_data; struct kvm_vcpu *vcpu = seqf->private; /* Write does not affect our buffers previously generated with * show. seq_file is locked here to prevent races of init with * a show call */ mutex_lock(&seqf->lock); kvmppc_init_timing_stats(vcpu); mutex_unlock(&seqf->lock); err = count; } done: return err; } static int kvmppc_exit_timing_open(struct inode *inode, struct file *file) { return single_open(file, kvmppc_exit_timing_show, inode->i_private); } static const struct file_operations kvmppc_exit_timing_fops = { .owner = THIS_MODULE, .open = kvmppc_exit_timing_open, .read = seq_read, .write = kvmppc_exit_timing_write, .llseek = seq_lseek, .release = single_release, }; void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id) { static char dbg_fname[50]; struct dentry *debugfs_file; snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%u_timing", current->pid, id); debugfs_file = debugfs_create_file(dbg_fname, 0666, kvm_debugfs_dir, vcpu, &kvmppc_exit_timing_fops); if (!debugfs_file) { printk(KERN_ERR"%s: error creating debugfs file %s\n", __func__, dbg_fname); return; } vcpu->arch.debugfs_exit_timing = debugfs_file; } void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu) { if (vcpu->arch.debugfs_exit_timing) { debugfs_remove(vcpu->arch.debugfs_exit_timing); vcpu->arch.debugfs_exit_timing = NULL; } }