~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/kvm/timing.c

Version: ~ [ linux-5.3 ] ~ [ linux-5.2.15 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.73 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.144 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.193 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.193 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.73 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License, version 2, as
  4  * published by the Free Software Foundation.
  5  *
  6  * This program is distributed in the hope that it will be useful,
  7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  9  * GNU General Public License for more details.
 10  *
 11  * You should have received a copy of the GNU General Public License
 12  * along with this program; if not, write to the Free Software
 13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 14  *
 15  * Copyright IBM Corp. 2008
 16  *
 17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 18  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
 19  */
 20 
 21 #include <linux/kvm_host.h>
 22 #include <linux/fs.h>
 23 #include <linux/seq_file.h>
 24 #include <linux/debugfs.h>
 25 #include <linux/uaccess.h>
 26 #include <linux/module.h>
 27 
 28 #include <asm/time.h>
 29 #include <asm-generic/div64.h>
 30 
 31 #include "timing.h"
 32 
 33 void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu)
 34 {
 35         int i;
 36 
 37         /* Take a lock to avoid concurrent updates */
 38         mutex_lock(&vcpu->arch.exit_timing_lock);
 39 
 40         vcpu->arch.last_exit_type = 0xDEAD;
 41         for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
 42                 vcpu->arch.timing_count_type[i] = 0;
 43                 vcpu->arch.timing_max_duration[i] = 0;
 44                 vcpu->arch.timing_min_duration[i] = 0xFFFFFFFF;
 45                 vcpu->arch.timing_sum_duration[i] = 0;
 46                 vcpu->arch.timing_sum_quad_duration[i] = 0;
 47         }
 48         vcpu->arch.timing_last_exit = 0;
 49         vcpu->arch.timing_exit.tv64 = 0;
 50         vcpu->arch.timing_last_enter.tv64 = 0;
 51 
 52         mutex_unlock(&vcpu->arch.exit_timing_lock);
 53 }
 54 
 55 static void add_exit_timing(struct kvm_vcpu *vcpu, u64 duration, int type)
 56 {
 57         u64 old;
 58 
 59         mutex_lock(&vcpu->arch.exit_timing_lock);
 60 
 61         vcpu->arch.timing_count_type[type]++;
 62 
 63         /* sum */
 64         old = vcpu->arch.timing_sum_duration[type];
 65         vcpu->arch.timing_sum_duration[type] += duration;
 66         if (unlikely(old > vcpu->arch.timing_sum_duration[type])) {
 67                 printk(KERN_ERR"%s - wrap adding sum of durations"
 68                         " old %lld new %lld type %d exit # of type %d\n",
 69                         __func__, old, vcpu->arch.timing_sum_duration[type],
 70                         type, vcpu->arch.timing_count_type[type]);
 71         }
 72 
 73         /* square sum */
 74         old = vcpu->arch.timing_sum_quad_duration[type];
 75         vcpu->arch.timing_sum_quad_duration[type] += (duration*duration);
 76         if (unlikely(old > vcpu->arch.timing_sum_quad_duration[type])) {
 77                 printk(KERN_ERR"%s - wrap adding sum of squared durations"
 78                         " old %lld new %lld type %d exit # of type %d\n",
 79                         __func__, old,
 80                         vcpu->arch.timing_sum_quad_duration[type],
 81                         type, vcpu->arch.timing_count_type[type]);
 82         }
 83 
 84         /* set min/max */
 85         if (unlikely(duration < vcpu->arch.timing_min_duration[type]))
 86                 vcpu->arch.timing_min_duration[type] = duration;
 87         if (unlikely(duration > vcpu->arch.timing_max_duration[type]))
 88                 vcpu->arch.timing_max_duration[type] = duration;
 89 
 90         mutex_unlock(&vcpu->arch.exit_timing_lock);
 91 }
 92 
 93 void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu)
 94 {
 95         u64 exit = vcpu->arch.timing_last_exit;
 96         u64 enter = vcpu->arch.timing_last_enter.tv64;
 97 
 98         /* save exit time, used next exit when the reenter time is known */
 99         vcpu->arch.timing_last_exit = vcpu->arch.timing_exit.tv64;
100 
101         if (unlikely(vcpu->arch.last_exit_type == 0xDEAD || exit == 0))
102                 return; /* skip incomplete cycle (e.g. after reset) */
103 
104         /* update statistics for average and standard deviation */
105         add_exit_timing(vcpu, (enter - exit), vcpu->arch.last_exit_type);
106         /* enter -> timing_last_exit is time spent in guest - log this too */
107         add_exit_timing(vcpu, (vcpu->arch.timing_last_exit - enter),
108                         TIMEINGUEST);
109 }
110 
111 static const char *kvm_exit_names[__NUMBER_OF_KVM_EXIT_TYPES] = {
112         [MMIO_EXITS] =              "MMIO",
113         [SIGNAL_EXITS] =            "SIGNAL",
114         [ITLB_REAL_MISS_EXITS] =    "ITLBREAL",
115         [ITLB_VIRT_MISS_EXITS] =    "ITLBVIRT",
116         [DTLB_REAL_MISS_EXITS] =    "DTLBREAL",
117         [DTLB_VIRT_MISS_EXITS] =    "DTLBVIRT",
118         [SYSCALL_EXITS] =           "SYSCALL",
119         [ISI_EXITS] =               "ISI",
120         [DSI_EXITS] =               "DSI",
121         [EMULATED_INST_EXITS] =     "EMULINST",
122         [EMULATED_MTMSRWE_EXITS] =  "EMUL_WAIT",
123         [EMULATED_WRTEE_EXITS] =    "EMUL_WRTEE",
124         [EMULATED_MTSPR_EXITS] =    "EMUL_MTSPR",
125         [EMULATED_MFSPR_EXITS] =    "EMUL_MFSPR",
126         [EMULATED_MTMSR_EXITS] =    "EMUL_MTMSR",
127         [EMULATED_MFMSR_EXITS] =    "EMUL_MFMSR",
128         [EMULATED_TLBSX_EXITS] =    "EMUL_TLBSX",
129         [EMULATED_TLBWE_EXITS] =    "EMUL_TLBWE",
130         [EMULATED_RFI_EXITS] =      "EMUL_RFI",
131         [DEC_EXITS] =               "DEC",
132         [EXT_INTR_EXITS] =          "EXTINT",
133         [HALT_WAKEUP] =             "HALT",
134         [USR_PR_INST] =             "USR_PR_INST",
135         [FP_UNAVAIL] =              "FP_UNAVAIL",
136         [DEBUG_EXITS] =             "DEBUG",
137         [TIMEINGUEST] =             "TIMEINGUEST"
138 };
139 
140 static int kvmppc_exit_timing_show(struct seq_file *m, void *private)
141 {
142         struct kvm_vcpu *vcpu = m->private;
143         int i;
144         u64 min, max, sum, sum_quad;
145 
146         seq_printf(m, "%s", "type       count   min     max     sum     sum_squared\n");
147 
148 
149         for (i = 0; i < __NUMBER_OF_KVM_EXIT_TYPES; i++) {
150 
151                 min = vcpu->arch.timing_min_duration[i];
152                 do_div(min, tb_ticks_per_usec);
153                 max = vcpu->arch.timing_max_duration[i];
154                 do_div(max, tb_ticks_per_usec);
155                 sum = vcpu->arch.timing_sum_duration[i];
156                 do_div(sum, tb_ticks_per_usec);
157                 sum_quad = vcpu->arch.timing_sum_quad_duration[i];
158                 do_div(sum_quad, tb_ticks_per_usec);
159 
160                 seq_printf(m, "%12s     %10d    %10lld  %10lld  %20lld  %20lld\n",
161                         kvm_exit_names[i],
162                         vcpu->arch.timing_count_type[i],
163                         min,
164                         max,
165                         sum,
166                         sum_quad);
167 
168         }
169         return 0;
170 }
171 
172 /* Write 'c' to clear the timing statistics. */
173 static ssize_t kvmppc_exit_timing_write(struct file *file,
174                                        const char __user *user_buf,
175                                        size_t count, loff_t *ppos)
176 {
177         int err = -EINVAL;
178         char c;
179 
180         if (count > 1) {
181                 goto done;
182         }
183 
184         if (get_user(c, user_buf)) {
185                 err = -EFAULT;
186                 goto done;
187         }
188 
189         if (c == 'c') {
190                 struct seq_file *seqf = file->private_data;
191                 struct kvm_vcpu *vcpu = seqf->private;
192                 /* Write does not affect our buffers previously generated with
193                  * show. seq_file is locked here to prevent races of init with
194                  * a show call */
195                 mutex_lock(&seqf->lock);
196                 kvmppc_init_timing_stats(vcpu);
197                 mutex_unlock(&seqf->lock);
198                 err = count;
199         }
200 
201 done:
202         return err;
203 }
204 
205 static int kvmppc_exit_timing_open(struct inode *inode, struct file *file)
206 {
207         return single_open(file, kvmppc_exit_timing_show, inode->i_private);
208 }
209 
210 static const struct file_operations kvmppc_exit_timing_fops = {
211         .owner   = THIS_MODULE,
212         .open    = kvmppc_exit_timing_open,
213         .read    = seq_read,
214         .write   = kvmppc_exit_timing_write,
215         .llseek  = seq_lseek,
216         .release = single_release,
217 };
218 
219 void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id)
220 {
221         static char dbg_fname[50];
222         struct dentry *debugfs_file;
223 
224         snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%u_timing",
225                  current->pid, id);
226         debugfs_file = debugfs_create_file(dbg_fname, 0666,
227                                         kvm_debugfs_dir, vcpu,
228                                         &kvmppc_exit_timing_fops);
229 
230         if (!debugfs_file) {
231                 printk(KERN_ERR"%s: error creating debugfs file %s\n",
232                         __func__, dbg_fname);
233                 return;
234         }
235 
236         vcpu->arch.debugfs_exit_timing = debugfs_file;
237 }
238 
239 void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu)
240 {
241         if (vcpu->arch.debugfs_exit_timing) {
242                 debugfs_remove(vcpu->arch.debugfs_exit_timing);
243                 vcpu->arch.debugfs_exit_timing = NULL;
244         }
245 }
246 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp