]>
git.proxmox.com Git - mirror_lxcfs.git/blob - src/proc_cpuview.c
cbb03757379d14d198d034b046e0bd977603082c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
10 #ifndef FUSE_USE_VERSION
11 #define FUSE_USE_VERSION 30
14 #ifndef FUSE_USE_VERSION
15 #define FUSE_USE_VERSION 26
19 #define _FILE_OFFSET_BITS 64
21 #define __STDC_FORMAT_MACROS
39 #include <linux/magic.h>
40 #include <linux/sched.h>
41 #include <sys/epoll.h>
43 #include <sys/mount.h>
44 #include <sys/param.h>
45 #include <sys/socket.h>
46 #include <sys/syscall.h>
47 #include <sys/sysinfo.h>
51 #include "cgroup_fuse.h"
52 #include "cpuset_parse.h"
53 #include "cgroups/cgroup.h"
54 #include "cgroups/cgroup_utils.h"
55 #include "memory_utils.h"
56 #include "proc_loadavg.h"
59 /* Data for CPU view */
62 struct cpuacct_usage
*usage
; /* Real usage as read from the host's /proc/stat. */
63 struct cpuacct_usage
*view
; /* Usage stats reported to the container. */
65 pthread_mutex_t lock
; /* For node manipulation. */
66 struct cg_proc_stat
*next
;
69 struct cg_proc_stat_head
{
70 struct cg_proc_stat
*next
;
74 * For access to the list. Reading can be parallel, pruning is exclusive.
76 pthread_rwlock_t lock
;
79 #define CPUVIEW_HASH_SIZE 100
80 static struct cg_proc_stat_head
*proc_stat_history
[CPUVIEW_HASH_SIZE
];
82 static void reset_proc_stat_node(struct cg_proc_stat
*node
,
83 struct cpuacct_usage
*usage
, int cpu_count
)
85 lxcfs_debug("Resetting stat node for %s\n", node
->cg
);
86 memcpy(node
->usage
, usage
, sizeof(struct cpuacct_usage
) * cpu_count
);
88 for (int i
= 0; i
< cpu_count
; i
++) {
89 node
->view
[i
].user
= 0;
90 node
->view
[i
].system
= 0;
91 node
->view
[i
].idle
= 0;
94 node
->cpu_count
= cpu_count
;
97 static bool expand_proc_stat_node(struct cg_proc_stat
*node
, int cpu_count
)
99 __do_free
struct cpuacct_usage
*new_usage
= NULL
, *new_view
= NULL
;
101 /* Allocate new memory */
102 new_usage
= zalloc(sizeof(struct cpuacct_usage
) * cpu_count
);
106 new_view
= zalloc(sizeof(struct cpuacct_usage
) * cpu_count
);
110 /* Copy existing data & initialize new elements */
111 for (int i
= 0; i
< cpu_count
; i
++) {
112 if (i
< node
->cpu_count
) {
113 new_usage
[i
].user
= node
->usage
[i
].user
;
114 new_usage
[i
].system
= node
->usage
[i
].system
;
115 new_usage
[i
].idle
= node
->usage
[i
].idle
;
117 new_view
[i
].user
= node
->view
[i
].user
;
118 new_view
[i
].system
= node
->view
[i
].system
;
119 new_view
[i
].idle
= node
->view
[i
].idle
;
124 node
->usage
= move_ptr(new_usage
);
127 node
->view
= move_ptr(new_view
);
128 node
->cpu_count
= cpu_count
;
133 static void free_proc_stat_node(struct cg_proc_stat
*node
)
137 * We're abusing the usage pointer to indicate that
138 * pthread_mutex_init() was successful. Don't judge me.
141 pthread_mutex_destroy(&node
->lock
);
142 free_disarm(node
->cg
);
143 free_disarm(node
->usage
);
144 free_disarm(node
->view
);
149 define_cleanup_function(struct cg_proc_stat
*, free_proc_stat_node
);
151 static struct cg_proc_stat
*add_proc_stat_node(struct cg_proc_stat
*new_node
)
153 call_cleaner(free_proc_stat_node
) struct cg_proc_stat
*new = new_node
;
154 struct cg_proc_stat
*rv
= new_node
;
155 int hash
= calc_hash(new->cg
) % CPUVIEW_HASH_SIZE
;
156 struct cg_proc_stat_head
*head
= proc_stat_history
[hash
];
157 struct cg_proc_stat
*cur
;
159 pthread_rwlock_wrlock(&head
->lock
);
162 head
->next
= move_ptr(new);
163 goto out_rwlock_unlock
;
170 * The node to be added is already present in the list, so
171 * free the newly allocated one and return the one we found.
173 if (strcmp(cur
->cg
, new->cg
) == 0) {
175 goto out_rwlock_unlock
;
184 /* Add new node to end of list. */
185 cur
->next
= move_ptr(new);
186 goto out_rwlock_unlock
;
190 pthread_rwlock_unlock(&head
->lock
);
194 static struct cg_proc_stat
*new_proc_stat_node(struct cpuacct_usage
*usage
,
195 int cpu_count
, const char *cg
)
197 call_cleaner(free_proc_stat_node
) struct cg_proc_stat
*node
= NULL
;
198 __do_free
struct cpuacct_usage
*new_usage
= NULL
;
200 node
= zalloc(sizeof(struct cg_proc_stat
));
204 node
->cg
= strdup(cg
);
208 new_usage
= memdup(usage
, sizeof(struct cpuacct_usage
) * cpu_count
);
212 node
->view
= zalloc(sizeof(struct cpuacct_usage
) * cpu_count
);
216 node
->cpu_count
= cpu_count
;
218 if (pthread_mutex_init(&node
->lock
, NULL
))
221 * We're abusing the usage pointer to indicate that
222 * pthread_mutex_init() was successful. Don't judge me.
224 node
->usage
= move_ptr(new_usage
);
226 return move_ptr(node
);
229 static bool cgroup_supports(const char *controller
, const char *cgroup
,
232 __do_free
char *path
= NULL
;
235 cfd
= get_cgroup_fd(controller
);
239 path
= must_make_path_relative(cgroup
, file
, NULL
);
240 return faccessat(cfd
, path
, F_OK
, 0) == 0;
243 static struct cg_proc_stat
*prune_proc_stat_list(struct cg_proc_stat
*node
)
245 struct cg_proc_stat
*first
= NULL
;
247 for (struct cg_proc_stat
*prev
= NULL
; node
; ) {
248 if (!cgroup_supports("cpu", node
->cg
, "cpu.shares")) {
249 call_cleaner(free_proc_stat_node
) struct cg_proc_stat
*cur
= node
;
252 prev
->next
= node
->next
;
257 lxcfs_debug("Removing stat node for %s\n", cur
->cg
);
269 #define PROC_STAT_PRUNE_INTERVAL 10
270 static void prune_proc_stat_history(void)
272 time_t now
= time(NULL
);
274 for (int i
= 0; i
< CPUVIEW_HASH_SIZE
; i
++) {
275 pthread_rwlock_wrlock(&proc_stat_history
[i
]->lock
);
277 if ((proc_stat_history
[i
]->lastcheck
+ PROC_STAT_PRUNE_INTERVAL
) > now
) {
278 pthread_rwlock_unlock(&proc_stat_history
[i
]->lock
);
282 if (proc_stat_history
[i
]->next
) {
283 proc_stat_history
[i
]->next
= prune_proc_stat_list(proc_stat_history
[i
]->next
);
284 proc_stat_history
[i
]->lastcheck
= now
;
287 pthread_rwlock_unlock(&proc_stat_history
[i
]->lock
);
291 static struct cg_proc_stat
*find_proc_stat_node(struct cg_proc_stat_head
*head
,
294 struct cg_proc_stat
*node
;
296 pthread_rwlock_rdlock(&head
->lock
);
299 pthread_rwlock_unlock(&head
->lock
);
306 if (strcmp(cg
, node
->cg
) == 0)
308 } while ((node
= node
->next
));
313 pthread_rwlock_unlock(&head
->lock
);
314 prune_proc_stat_history();
318 static struct cg_proc_stat
*find_or_create_proc_stat_node(struct cpuacct_usage
*usage
,
319 int cpu_count
, const char *cg
)
321 int hash
= calc_hash(cg
) % CPUVIEW_HASH_SIZE
;
322 struct cg_proc_stat_head
*head
= proc_stat_history
[hash
];
323 struct cg_proc_stat
*node
;
325 node
= find_proc_stat_node(head
, cg
);
327 node
= new_proc_stat_node(usage
, cpu_count
, cg
);
331 node
= add_proc_stat_node(node
);
332 lxcfs_debug("New stat node (%d) for %s\n", cpu_count
, cg
);
335 pthread_mutex_lock(&node
->lock
);
338 * If additional CPUs on the host have been enabled, CPU usage counter
339 * arrays have to be expanded.
341 if (node
->cpu_count
< cpu_count
) {
342 lxcfs_debug("Expanding stat node %d->%d for %s\n",
343 node
->cpu_count
, cpu_count
, cg
);
345 if (!expand_proc_stat_node(node
, cpu_count
)) {
346 pthread_mutex_unlock(&node
->lock
);
347 return log_debug(NULL
, "Unable to expand stat node %d->%d for %s", node
->cpu_count
, cpu_count
, cg
);
354 static void add_cpu_usage(uint64_t *surplus
, struct cpuacct_usage
*usage
,
355 uint64_t *counter
, uint64_t threshold
)
357 uint64_t free_space
, to_add
;
359 free_space
= threshold
- usage
->user
- usage
->system
;
361 if (free_space
> usage
->idle
)
362 free_space
= usage
->idle
;
364 if (free_space
> *surplus
)
370 usage
->idle
-= to_add
;
374 static uint64_t diff_cpu_usage(struct cpuacct_usage
*older
,
375 struct cpuacct_usage
*newer
,
376 struct cpuacct_usage
*diff
, int cpu_count
)
380 for (int i
= 0; i
< cpu_count
; i
++) {
381 if (!newer
[i
].online
)
385 * When cpuset is changed on the fly, the CPUs might get
386 * reordered. We could either reset all counters, or check
387 * that the substractions below will return expected results.
389 if (newer
[i
].user
> older
[i
].user
)
390 diff
[i
].user
= newer
[i
].user
- older
[i
].user
;
394 if (newer
[i
].system
> older
[i
].system
)
395 diff
[i
].system
= newer
[i
].system
- older
[i
].system
;
399 if (newer
[i
].idle
> older
[i
].idle
)
400 diff
[i
].idle
= newer
[i
].idle
- older
[i
].idle
;
405 sum
+= diff
[i
].system
;
413 * Read cgroup CPU quota parameters from `cpu.cfs_quota_us` or
414 * `cpu.cfs_period_us`, depending on `param`. Parameter value is returned
417 static bool read_cpu_cfs_param(const char *cg
, const char *param
, int64_t *value
)
419 __do_free
char *str
= NULL
;
420 char file
[STRLITERALLEN("cpu.cfs_period_us") + 1];
424 if (pure_unified_layout(cgroup_ops
)) {
425 first
= !strcmp(param
, "quota");
426 ret
= snprintf(file
, sizeof(file
), "cpu.max");
428 ret
= snprintf(file
, sizeof(file
), "cpu.cfs_%s_us", param
);
430 if (ret
< 0 || (size_t)ret
>= sizeof(file
))
433 if (!cgroup_ops
->get(cgroup_ops
, "cpu", cg
, file
, &str
))
436 return sscanf(str
, first
? "%" PRId64
: "%*d %" PRId64
, value
) == 1;
440 * Return the exact number of visible CPUs based on CPU quotas.
441 * If there is no quota set, zero is returned.
443 static double exact_cpu_count(const char *cg
)
447 int64_t cfs_quota
, cfs_period
;
449 if (!read_cpu_cfs_param(cg
, "quota", &cfs_quota
))
452 if (!read_cpu_cfs_param(cg
, "period", &cfs_period
))
455 if (cfs_quota
<= 0 || cfs_period
<= 0)
458 rv
= (double)cfs_quota
/ (double)cfs_period
;
460 nprocs
= get_nprocs();
469 * Return the maximum number of visible CPUs based on CPU quotas.
470 * If there is no quota set, zero is returned.
472 int max_cpu_count(const char *cg
)
474 __do_free
char *cpuset
= NULL
;
476 int64_t cfs_quota
, cfs_period
;
477 int nr_cpus_in_cpuset
= 0;
479 if (!read_cpu_cfs_param(cg
, "quota", &cfs_quota
))
482 if (!read_cpu_cfs_param(cg
, "period", &cfs_period
))
485 cpuset
= get_cpuset(cg
);
487 nr_cpus_in_cpuset
= cpu_number_in_cpuset(cpuset
);
489 if (cfs_quota
<= 0 || cfs_period
<= 0) {
490 if (nr_cpus_in_cpuset
> 0)
491 return nr_cpus_in_cpuset
;
496 rv
= cfs_quota
/ cfs_period
;
499 * In case quota/period does not yield a whole number, add one CPU for
502 if ((cfs_quota
% cfs_period
) > 0)
505 nprocs
= get_nprocs();
509 /* Use min value in cpu quota and cpuset. */
510 if (nr_cpus_in_cpuset
> 0 && nr_cpus_in_cpuset
< rv
)
511 rv
= nr_cpus_in_cpuset
;
516 int cpuview_proc_stat(const char *cg
, const char *cpuset
,
517 struct cpuacct_usage
*cg_cpu_usage
, int cg_cpu_usage_size
,
518 FILE *f
, char *buf
, size_t buf_size
)
520 __do_free
char *line
= NULL
;
521 __do_free
struct cpuacct_usage
*diff
= NULL
;
522 size_t linelen
= 0, total_len
= 0;
523 int curcpu
= -1; /* cpu numbering starts at 0 */
526 uint64_t user
= 0, nice
= 0, system
= 0, idle
= 0, iowait
= 0, irq
= 0,
527 softirq
= 0, steal
= 0, guest
= 0, guest_nice
= 0;
528 uint64_t user_sum
= 0, system_sum
= 0, idle_sum
= 0;
529 uint64_t user_surplus
= 0, system_surplus
= 0;
530 int nprocs
, max_cpus
;
532 uint64_t total_sum
, threshold
;
533 struct cg_proc_stat
*stat_node
;
535 nprocs
= get_nprocs_conf();
536 if (cg_cpu_usage_size
< nprocs
)
537 nprocs
= cg_cpu_usage_size
;
539 /* Read all CPU stats and stop when we've encountered other lines */
540 while (getline(&line
, &linelen
, f
) != -1) {
542 char cpu_char
[10]; /* That's a lot of cores */
543 uint64_t all_used
, cg_used
;
545 if (strlen(line
) == 0)
548 /* not a ^cpuN line containing a number N */
549 if (sscanf(line
, "cpu%9[^ ]", cpu_char
) != 1)
552 if (sscanf(cpu_char
, "%d", &physcpu
) != 1)
555 if (physcpu
>= cg_cpu_usage_size
)
561 if (!cpu_in_cpuset(physcpu
, cpuset
)) {
562 for (i
= curcpu
; i
<= physcpu
; i
++)
563 cg_cpu_usage
[i
].online
= false;
567 if (curcpu
< physcpu
) {
568 /* Some CPUs may be disabled */
569 for (i
= curcpu
; i
< physcpu
; i
++)
570 cg_cpu_usage
[i
].online
= false;
575 cg_cpu_usage
[curcpu
].online
= true;
577 ret
= sscanf(line
, "%*s %" PRIu64
" %" PRIu64
" %" PRIu64
" %" PRIu64
" %" PRIu64
" %" PRIu64
" %" PRIu64
" %" PRIu64
" %" PRIu64
" %" PRIu64
"lu",
591 all_used
= user
+ nice
+ system
+ iowait
+ irq
+ softirq
+ steal
+ guest
+ guest_nice
;
592 cg_used
= cg_cpu_usage
[curcpu
].user
+ cg_cpu_usage
[curcpu
].system
;
594 if (all_used
>= cg_used
) {
595 cg_cpu_usage
[curcpu
].idle
= idle
+ (all_used
- cg_used
);
598 lxcfs_error("cpu%d from %s has unexpected cpu time: %" PRIu64
" in /proc/stat, %" PRIu64
" in cpuacct.usage_all; unable to determine idle time",
599 curcpu
, cg
, all_used
, cg_used
);
600 cg_cpu_usage
[curcpu
].idle
= idle
;
604 /* Cannot use more CPUs than is available in cpuset. */
605 max_cpus
= max_cpu_count(cg
);
606 if (max_cpus
> cpu_cnt
|| !max_cpus
)
609 /* takes lock pthread_mutex_lock(&node->lock) */
610 stat_node
= find_or_create_proc_stat_node(cg_cpu_usage
, nprocs
, cg
);
612 return log_error(0, "Failed to find/create stat node for %s", cg
);
614 diff
= zalloc(sizeof(struct cpuacct_usage
) * nprocs
);
616 goto out_pthread_mutex_unlock
;
619 * If the new values are LOWER than values stored in memory, it means
620 * the cgroup has been reset/recreated and we should reset too.
622 for (curcpu
= 0; curcpu
< nprocs
; curcpu
++) {
623 if (!cg_cpu_usage
[curcpu
].online
)
626 if (cg_cpu_usage
[curcpu
].user
< stat_node
->usage
[curcpu
].user
)
627 reset_proc_stat_node(stat_node
, cg_cpu_usage
, nprocs
);
632 total_sum
= diff_cpu_usage(stat_node
->usage
, cg_cpu_usage
, diff
, nprocs
);
634 for (curcpu
= 0, i
= -1; curcpu
< nprocs
; curcpu
++) {
635 stat_node
->usage
[curcpu
].online
= cg_cpu_usage
[curcpu
].online
;
637 if (!stat_node
->usage
[curcpu
].online
)
642 stat_node
->usage
[curcpu
].user
+= diff
[curcpu
].user
;
643 stat_node
->usage
[curcpu
].system
+= diff
[curcpu
].system
;
644 stat_node
->usage
[curcpu
].idle
+= diff
[curcpu
].idle
;
646 if (max_cpus
> 0 && i
>= max_cpus
) {
647 user_surplus
+= diff
[curcpu
].user
;
648 system_surplus
+= diff
[curcpu
].system
;
652 /* Calculate usage counters of visible CPUs */
654 uint64_t diff_user
= 0;
655 uint64_t diff_system
= 0;
656 uint64_t diff_idle
= 0;
657 uint64_t max_diff_idle
= 0;
658 uint64_t max_diff_idle_index
= 0;
660 /* threshold = maximum usage per cpu, including idle */
661 threshold
= total_sum
/ cpu_cnt
* max_cpus
;
663 for (curcpu
= 0, i
= -1; curcpu
< nprocs
; curcpu
++) {
664 if (!stat_node
->usage
[curcpu
].online
)
672 if (diff
[curcpu
].user
+ diff
[curcpu
].system
>= threshold
)
676 add_cpu_usage(&user_surplus
, &diff
[curcpu
],
677 &diff
[curcpu
].user
, threshold
);
679 if (diff
[curcpu
].user
+ diff
[curcpu
].system
>= threshold
)
682 /* If there is still room, add system */
683 add_cpu_usage(&system_surplus
, &diff
[curcpu
],
684 &diff
[curcpu
].system
, threshold
);
687 if (user_surplus
> 0)
688 lxcfs_debug("leftover user: %lu for %s\n", user_surplus
, cg
);
689 if (system_surplus
> 0)
690 lxcfs_debug("leftover system: %lu for %s\n", system_surplus
, cg
);
692 for (curcpu
= 0, i
= -1; curcpu
< nprocs
; curcpu
++) {
693 if (!stat_node
->usage
[curcpu
].online
)
701 stat_node
->view
[curcpu
].user
+= diff
[curcpu
].user
;
702 stat_node
->view
[curcpu
].system
+= diff
[curcpu
].system
;
703 stat_node
->view
[curcpu
].idle
+= diff
[curcpu
].idle
;
705 user_sum
+= stat_node
->view
[curcpu
].user
;
706 system_sum
+= stat_node
->view
[curcpu
].system
;
707 idle_sum
+= stat_node
->view
[curcpu
].idle
;
709 diff_user
+= diff
[curcpu
].user
;
710 diff_system
+= diff
[curcpu
].system
;
711 diff_idle
+= diff
[curcpu
].idle
;
712 if (diff
[curcpu
].idle
> max_diff_idle
) {
713 max_diff_idle
= diff
[curcpu
].idle
;
714 max_diff_idle_index
= curcpu
;
717 lxcfs_v("curcpu: %d, diff_user: %lu, diff_system: %lu, diff_idle: %lu\n", curcpu
, diff
[curcpu
].user
, diff
[curcpu
].system
, diff
[curcpu
].idle
);
719 lxcfs_v("total. diff_user: %lu, diff_system: %lu, diff_idle: %lu\n", diff_user
, diff_system
, diff_idle
);
721 /* revise cpu usage view to support partial cpu case. */
722 exact_cpus
= exact_cpu_count(cg
);
723 if (exact_cpus
< (double)max_cpus
){
724 uint64_t delta
= (uint64_t)((double)(diff_user
+ diff_system
+ diff_idle
) * (1 - exact_cpus
/ (double)max_cpus
));
726 lxcfs_v("revising cpu usage view to match the exact cpu count [%f]\n", exact_cpus
);
727 lxcfs_v("delta: %lu\n", delta
);
728 lxcfs_v("idle_sum before: %lu\n", idle_sum
);
729 if (idle_sum
> delta
)
730 idle_sum
= idle_sum
- delta
;
733 lxcfs_v("idle_sum after: %lu\n", idle_sum
);
735 curcpu
= max_diff_idle_index
;
736 lxcfs_v("curcpu: %d, idle before: %lu\n", curcpu
, stat_node
->view
[curcpu
].idle
);
737 if (stat_node
->view
[curcpu
].idle
> delta
)
738 stat_node
->view
[curcpu
].idle
= stat_node
->view
[curcpu
].idle
- delta
;
740 stat_node
->view
[curcpu
].idle
= 0;
741 lxcfs_v("curcpu: %d, idle after: %lu\n", curcpu
, stat_node
->view
[curcpu
].idle
);
744 for (curcpu
= 0; curcpu
< nprocs
; curcpu
++) {
745 if (!stat_node
->usage
[curcpu
].online
)
748 stat_node
->view
[curcpu
].user
= stat_node
->usage
[curcpu
].user
;
749 stat_node
->view
[curcpu
].system
= stat_node
->usage
[curcpu
].system
;
750 stat_node
->view
[curcpu
].idle
= stat_node
->usage
[curcpu
].idle
;
752 user_sum
+= stat_node
->view
[curcpu
].user
;
753 system_sum
+= stat_node
->view
[curcpu
].system
;
754 idle_sum
+= stat_node
->view
[curcpu
].idle
;
758 /* Render the file */
760 l
= snprintf(buf
, buf_size
,
761 "cpu %" PRIu64
" 0 %" PRIu64
" %" PRIu64
" 0 0 0 0 0 0\n",
762 user_sum
, system_sum
, idle_sum
);
763 lxcfs_v("cpu-all: %s\n", buf
);
765 lxcfs_error("Failed to write cache");
767 goto out_pthread_mutex_unlock
;
770 lxcfs_error("Write to cache was truncated");
772 goto out_pthread_mutex_unlock
;
779 /* Render visible CPUs */
780 for (curcpu
= 0, i
= -1; curcpu
< nprocs
; curcpu
++) {
781 if (!stat_node
->usage
[curcpu
].online
)
786 if (max_cpus
> 0 && i
== max_cpus
)
789 l
= snprintf(buf
, buf_size
, "cpu%d %" PRIu64
" 0 %" PRIu64
" %" PRIu64
" 0 0 0 0 0 0\n",
791 stat_node
->view
[curcpu
].user
,
792 stat_node
->view
[curcpu
].system
,
793 stat_node
->view
[curcpu
].idle
);
794 lxcfs_v("cpu: %s\n", buf
);
796 lxcfs_error("Failed to write cache");
798 goto out_pthread_mutex_unlock
;
801 lxcfs_error("Write to cache was truncated");
803 goto out_pthread_mutex_unlock
;
811 /* Pass the rest of /proc/stat, start with the last line read */
812 l
= snprintf(buf
, buf_size
, "%s", line
);
814 lxcfs_error("Failed to write cache");
816 goto out_pthread_mutex_unlock
;
819 lxcfs_error("Write to cache was truncated");
821 goto out_pthread_mutex_unlock
;
828 /* Pass the rest of the host's /proc/stat */
829 while (getline(&line
, &linelen
, f
) != -1) {
830 l
= snprintf(buf
, buf_size
, "%s", line
);
832 lxcfs_error("Failed to write cache");
834 goto out_pthread_mutex_unlock
;
837 lxcfs_error("Write to cache was truncated");
839 goto out_pthread_mutex_unlock
;
847 out_pthread_mutex_unlock
:
849 pthread_mutex_unlock(&stat_node
->lock
);
855 * check whether this is a '^processor" line in /proc/cpuinfo
857 static inline bool is_processor_line(const char *line
)
860 return sscanf(line
, "processor : %d", &cpu
) == 1;
863 static inline bool cpuline_in_cpuset(const char *line
, const char *cpuset
)
867 if (sscanf(line
, "processor : %d", &cpu
) == 1)
868 return cpu_in_cpuset(cpu
, cpuset
);
873 int proc_cpuinfo_read(char *buf
, size_t size
, off_t offset
,
874 struct fuse_file_info
*fi
)
876 __do_free
char *cg
= NULL
, *cpuset
= NULL
, *line
= NULL
;
877 __do_free
void *fopen_cache
= NULL
;
878 __do_fclose
FILE *f
= NULL
;
879 struct fuse_context
*fc
= fuse_get_context();
880 struct lxcfs_opts
*opts
= (struct lxcfs_opts
*)fc
->private_data
;
881 struct file_info
*d
= INTTYPE_TO_PTR(fi
->fh
);
882 size_t linelen
= 0, total_len
= 0;
883 bool am_printing
= false, firstline
= true, is_s390x
= false;
884 int curcpu
= -1, cpu
, max_cpus
= 0;
886 char *cache
= d
->buf
;
887 size_t cache_size
= d
->buflen
;
892 if (offset
> d
->size
)
898 left
= d
->size
- offset
;
899 total_len
= left
> size
? size
: left
;
900 memcpy(buf
, cache
+ offset
, total_len
);
905 pid_t initpid
= lookup_initpid_in_store(fc
->pid
);
906 if (initpid
<= 1 || is_shared_pidns(initpid
))
909 cg
= get_pid_cgroup(initpid
, "cpuset");
911 return read_file_fuse("proc/cpuinfo", buf
, size
, d
);
912 prune_init_slice(cg
);
914 cpuset
= get_cpuset(cg
);
918 if (cgroup_ops
->can_use_cpuview(cgroup_ops
) && opts
&& opts
->use_cfs
)
923 max_cpus
= max_cpu_count(cg
);
925 f
= fopen_cached("/proc/cpuinfo", "re", &fopen_cache
);
929 while (getline(&line
, &linelen
, f
) != -1) {
933 if (strstr(line
, "IBM/S390") != NULL
) {
940 if (strncmp(line
, "# processors:", 12) == 0)
943 if (is_processor_line(line
)) {
944 if (use_view
&& max_cpus
> 0 && (curcpu
+ 1) == max_cpus
)
947 am_printing
= cpuline_in_cpuset(line
, cpuset
);
950 l
= snprintf(cache
, cache_size
, "processor : %d\n", curcpu
);
952 return log_error(0, "Failed to write cache");
954 return log_error(0, "Write to cache was truncated");
960 } else if (is_s390x
&& sscanf(line
, "processor %d:", &cpu
) == 1) {
963 if (use_view
&& max_cpus
> 0 && (curcpu
+ 1) == max_cpus
)
966 if (!cpu_in_cpuset(cpu
, cpuset
))
970 p
= strchr(line
, ':');
975 l
= snprintf(cache
, cache_size
, "processor %d:%s", curcpu
, p
);
977 return log_error(0, "Failed to write cache");
979 return log_error(0, "Write to cache was truncated");
988 l
= snprintf(cache
, cache_size
, "%s", line
);
990 return log_error(0, "Failed to write cache");
992 return log_error(0, "Write to cache was truncated");
1001 __do_free
char *origcache
= d
->buf
;
1004 d
->buf
= malloc(d
->buflen
);
1006 d
->buf
= move_ptr(origcache
);
1011 cache_size
= d
->buflen
;
1013 l
= snprintf(cache
, cache_size
, "vendor_id : IBM/S390\n");
1014 if (l
< 0 || l
>= cache_size
)
1020 l
= snprintf(cache
, cache_size
, "# processors : %d\n", curcpu
+ 1);
1021 if (l
< 0 || l
>= cache_size
)
1027 l
= snprintf(cache
, cache_size
, "%s", origcache
);
1028 if (l
< 0 || l
>= cache_size
)
1034 d
->size
= total_len
;
1035 if (total_len
> size
)
1038 /* read from off 0 */
1039 memcpy(buf
, d
->buf
, total_len
);
1045 * Returns 0 on success.
1046 * It is the caller's responsibility to free `return_usage`, unless this
1047 * function returns an error.
1049 int read_cpuacct_usage_all(char *cg
, char *cpuset
,
1050 struct cpuacct_usage
**return_usage
, int *size
)
1052 __do_free
char *usage_str
= NULL
;
1053 __do_free
struct cpuacct_usage
*cpu_usage
= NULL
;
1054 int i
= 0, j
= 0, read_pos
= 0, read_cnt
= 0;
1058 uint64_t cg_user
, cg_system
;
1059 int64_t ticks_per_sec
;
1061 ticks_per_sec
= sysconf(_SC_CLK_TCK
);
1062 if (ticks_per_sec
< 0 && errno
== EINVAL
) {
1063 lxcfs_debug("%m - Failed to determine number of ticks per second");
1067 cpucount
= get_nprocs_conf();
1068 cpu_usage
= malloc(sizeof(struct cpuacct_usage
) * cpucount
);
1072 memset(cpu_usage
, 0, sizeof(struct cpuacct_usage
) * cpucount
);
1073 if (!cgroup_ops
->get(cgroup_ops
, "cpuacct", cg
, "cpuacct.usage_all", &usage_str
)) {
1074 char *sep
= " \t\n";
1077 /* Read cpuacct.usage_percpu instead. */
1078 lxcfs_debug("Falling back to cpuacct.usage_percpu");
1079 if (!cgroup_ops
->get(cgroup_ops
, "cpuacct", cg
, "cpuacct.usage_percpu", &usage_str
))
1082 lxc_iterate_parts(tok
, usage_str
, sep
) {
1083 uint64_t percpu_user
;
1088 tok
= trim_whitespace_in_place(tok
);
1089 ret
= safe_uint64(tok
, &percpu_user
, 10);
1093 /* Convert the time from nanoseconds to USER_HZ */
1094 cpu_usage
[i
].user
= percpu_user
/ 1000.0 / 1000 / 1000 * ticks_per_sec
;
1095 cpu_usage
[i
].system
= cpu_usage
[i
].user
;
1097 lxcfs_debug("cpu%d with time %s", i
, tok
);
1100 if (sscanf(usage_str
, "cpu user system\n%n", &read_cnt
) != 0)
1101 return log_error(-1, "read_cpuacct_usage_all reading first line from %s/cpuacct.usage_all failed", cg
);
1103 read_pos
+= read_cnt
;
1105 for (i
= 0, j
= 0; i
< cpucount
; i
++) {
1106 ret
= sscanf(usage_str
+ read_pos
,
1107 "%d %" PRIu64
" %" PRIu64
"\n%n", &cg_cpu
,
1108 &cg_user
, &cg_system
, &read_cnt
);
1114 return log_error(-EINVAL
, "Failed to parse cpuacct.usage_all line %s from cgroup %s",
1115 usage_str
+ read_pos
, cg
);
1117 read_pos
+= read_cnt
;
1119 /* Convert the time from nanoseconds to USER_HZ */
1120 cpu_usage
[j
].user
= cg_user
/ 1000.0 / 1000 / 1000 * ticks_per_sec
;
1121 cpu_usage
[j
].system
= cg_system
/ 1000.0 / 1000 / 1000 * ticks_per_sec
;
1126 *return_usage
= move_ptr(cpu_usage
);
1131 static bool cpuview_init_head(struct cg_proc_stat_head
**head
)
1133 __do_free
struct cg_proc_stat_head
*h
;
1135 h
= zalloc(sizeof(struct cg_proc_stat_head
));
1139 if (pthread_rwlock_init(&h
->lock
, NULL
))
1142 h
->lastcheck
= time(NULL
);
1144 *head
= move_ptr(h
);
1148 bool init_cpuview(void)
1152 for (i
= 0; i
< CPUVIEW_HASH_SIZE
; i
++)
1153 proc_stat_history
[i
] = NULL
;
1155 for (i
= 0; i
< CPUVIEW_HASH_SIZE
; i
++) {
1156 if (!cpuview_init_head(&proc_stat_history
[i
]))
1163 for (i
= 0; i
< CPUVIEW_HASH_SIZE
; i
++) {
1164 if (proc_stat_history
[i
])
1165 free_disarm(proc_stat_history
[i
]);
1171 static void cpuview_free_head(struct cg_proc_stat_head
*head
)
1173 struct cg_proc_stat
*node
;
1179 struct cg_proc_stat
*cur
= node
;
1181 free_proc_stat_node(cur
);
1187 pthread_rwlock_destroy(&head
->lock
);
1191 void free_cpuview(void)
1193 for (int i
= 0; i
< CPUVIEW_HASH_SIZE
; i
++)
1194 if (proc_stat_history
[i
])
1195 cpuview_free_head(proc_stat_history
[i
]);