4 * Builtin regression testing command: ever growing number of sanity tests
8 #include "util/cache.h"
9 #include "util/debug.h"
10 #include "util/parse-options.h"
11 #include "util/session.h"
12 #include "util/symbol.h"
13 #include "util/thread.h"
15 static long page_size
;
17 static int vmlinux_matches_kallsyms_filter(struct map
*map __used
, struct symbol
*sym
)
19 bool *visited
= symbol__priv(sym
);
24 static int test__vmlinux_matches_kallsyms(void)
29 struct map
*kallsyms_map
, *vmlinux_map
;
30 struct machine kallsyms
, vmlinux
;
31 enum map_type type
= MAP__FUNCTION
;
32 struct ref_reloc_sym ref_reloc_sym
= { .name
= "_stext", };
37 * Init the machines that will hold kernel, modules obtained from
38 * both vmlinux + .ko files and from /proc/kallsyms split by modules.
40 machine__init(&kallsyms
, "", HOST_KERNEL_ID
);
41 machine__init(&vmlinux
, "", HOST_KERNEL_ID
);
46 * Create the kernel maps for kallsyms and the DSO where we will then
47 * load /proc/kallsyms. Also create the modules maps from /proc/modules
48 * and find the .ko files that match them in /lib/modules/`uname -r`/.
50 if (machine__create_kernel_maps(&kallsyms
) < 0) {
51 pr_debug("machine__create_kernel_maps ");
58 * Load and split /proc/kallsyms into multiple maps, one per module.
60 if (machine__load_kallsyms(&kallsyms
, "/proc/kallsyms", type
, NULL
) <= 0) {
61 pr_debug("dso__load_kallsyms ");
68 * kallsyms will be internally on demand sorted by name so that we can
69 * find the reference relocation * symbol, i.e. the symbol we will use
70 * to see if the running kernel was relocated by checking if it has the
71 * same value in the vmlinux file we load.
73 kallsyms_map
= machine__kernel_map(&kallsyms
, type
);
75 sym
= map__find_symbol_by_name(kallsyms_map
, ref_reloc_sym
.name
, NULL
);
77 pr_debug("dso__find_symbol_by_name ");
81 ref_reloc_sym
.addr
= sym
->start
;
86 * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
88 if (machine__create_kernel_maps(&vmlinux
) < 0) {
89 pr_debug("machine__create_kernel_maps ");
93 vmlinux_map
= machine__kernel_map(&vmlinux
, type
);
94 map__kmap(vmlinux_map
)->ref_reloc_sym
= &ref_reloc_sym
;
99 * Locate a vmlinux file in the vmlinux path that has a buildid that
100 * matches the one of the running kernel.
102 * While doing that look if we find the ref reloc symbol, if we find it
103 * we'll have its ref_reloc_symbol.unrelocated_addr and then
104 * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
105 * to fixup the symbols.
107 if (machine__load_vmlinux_path(&vmlinux
, type
,
108 vmlinux_matches_kallsyms_filter
) <= 0) {
109 pr_debug("machine__load_vmlinux_path ");
117 * Now look at the symbols in the vmlinux DSO and check if we find all of them
118 * in the kallsyms dso. For the ones that are in both, check its names and
121 for (nd
= rb_first(&vmlinux_map
->dso
->symbols
[type
]); nd
; nd
= rb_next(nd
)) {
122 struct symbol
*pair
, *first_pair
;
123 bool backwards
= true;
125 sym
= rb_entry(nd
, struct symbol
, rb_node
);
127 if (sym
->start
== sym
->end
)
130 first_pair
= machine__find_kernel_symbol(&kallsyms
, type
, sym
->start
, NULL
, NULL
);
133 if (pair
&& pair
->start
== sym
->start
) {
135 if (strcmp(sym
->name
, pair
->name
) == 0) {
137 * kallsyms don't have the symbol end, so we
138 * set that by using the next symbol start - 1,
139 * in some cases we get this up to a page
140 * wrong, trace_kmalloc when I was developing
141 * this code was one such example, 2106 bytes
142 * off the real size. More than that and we
143 * _really_ have a problem.
145 s64 skew
= sym
->end
- pair
->end
;
146 if (llabs(skew
) < page_size
)
149 pr_debug("%#Lx: diff end addr for %s v: %#Lx k: %#Lx\n",
150 sym
->start
, sym
->name
, sym
->end
, pair
->end
);
154 nnd
= backwards
? rb_prev(&pair
->rb_node
) :
155 rb_next(&pair
->rb_node
);
157 struct symbol
*next
= rb_entry(nnd
, struct symbol
, rb_node
);
159 if (next
->start
== sym
->start
) {
171 pr_debug("%#Lx: diff name v: %s k: %s\n",
172 sym
->start
, sym
->name
, pair
->name
);
175 pr_debug("%#Lx: %s not on kallsyms\n", sym
->start
, sym
->name
);
183 pr_info("Maps only in vmlinux:\n");
185 for (nd
= rb_first(&vmlinux
.kmaps
.maps
[type
]); nd
; nd
= rb_next(nd
)) {
186 struct map
*pos
= rb_entry(nd
, struct map
, rb_node
), *pair
;
188 * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
189 * the kernel will have the path for the vmlinux file being used,
190 * so use the short name, less descriptive but the same ("[kernel]" in
193 pair
= map_groups__find_by_name(&kallsyms
.kmaps
, type
,
195 pos
->dso
->short_name
:
200 map__fprintf(pos
, stderr
);
203 pr_info("Maps in vmlinux with a different name in kallsyms:\n");
205 for (nd
= rb_first(&vmlinux
.kmaps
.maps
[type
]); nd
; nd
= rb_next(nd
)) {
206 struct map
*pos
= rb_entry(nd
, struct map
, rb_node
), *pair
;
208 pair
= map_groups__find(&kallsyms
.kmaps
, type
, pos
->start
);
209 if (pair
== NULL
|| pair
->priv
)
212 if (pair
->start
== pos
->start
) {
214 pr_info(" %Lx-%Lx %Lx %s in kallsyms as",
215 pos
->start
, pos
->end
, pos
->pgoff
, pos
->dso
->name
);
216 if (pos
->pgoff
!= pair
->pgoff
|| pos
->end
!= pair
->end
)
217 pr_info(": \n*%Lx-%Lx %Lx",
218 pair
->start
, pair
->end
, pair
->pgoff
);
219 pr_info(" %s\n", pair
->dso
->name
);
224 pr_info("Maps only in kallsyms:\n");
226 for (nd
= rb_first(&kallsyms
.kmaps
.maps
[type
]);
227 nd
; nd
= rb_next(nd
)) {
228 struct map
*pos
= rb_entry(nd
, struct map
, rb_node
);
231 map__fprintf(pos
, stderr
);
237 #include "util/cpumap.h"
238 #include "util/evsel.h"
239 #include <sys/types.h>
241 static int trace_event__id(const char *event_name
)
246 if (asprintf(&filename
,
247 "/sys/kernel/debug/tracing/events/syscalls/%s/id",
251 fd
= open(filename
, O_RDONLY
);
254 if (read(fd
, id
, sizeof(id
)) > 0)
263 static int test__open_syscall_event(void)
266 struct thread_map
*threads
;
267 struct perf_evsel
*evsel
;
268 struct perf_event_attr attr
;
269 unsigned int nr_open_calls
= 111, i
;
270 int id
= trace_event__id("sys_enter_open");
273 pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
277 threads
= thread_map__new(-1, getpid());
278 if (threads
== NULL
) {
279 pr_debug("thread_map__new\n");
283 memset(&attr
, 0, sizeof(attr
));
284 attr
.type
= PERF_TYPE_TRACEPOINT
;
286 evsel
= perf_evsel__new(&attr
, 0);
288 pr_debug("perf_evsel__new\n");
289 goto out_thread_map_delete
;
292 if (perf_evsel__open_per_thread(evsel
, threads
) < 0) {
293 pr_debug("failed to open counter: %s, "
294 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
296 goto out_evsel_delete
;
299 for (i
= 0; i
< nr_open_calls
; ++i
) {
300 fd
= open("/etc/passwd", O_RDONLY
);
304 if (perf_evsel__read_on_cpu(evsel
, 0, 0) < 0) {
305 pr_debug("perf_evsel__open_read_on_cpu\n");
309 if (evsel
->counts
->cpu
[0].val
!= nr_open_calls
) {
310 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %Ld\n",
311 nr_open_calls
, evsel
->counts
->cpu
[0].val
);
317 perf_evsel__close_fd(evsel
, 1, threads
->nr
);
319 perf_evsel__delete(evsel
);
320 out_thread_map_delete
:
321 thread_map__delete(threads
);
327 static int test__open_syscall_event_on_all_cpus(void)
329 int err
= -1, fd
, cpu
;
330 struct thread_map
*threads
;
331 struct cpu_map
*cpus
;
332 struct perf_evsel
*evsel
;
333 struct perf_event_attr attr
;
334 unsigned int nr_open_calls
= 111, i
;
337 int id
= trace_event__id("sys_enter_open");
340 pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
344 threads
= thread_map__new(-1, getpid());
345 if (threads
== NULL
) {
346 pr_debug("thread_map__new\n");
350 cpus
= cpu_map__new(NULL
);
351 if (threads
== NULL
) {
352 pr_debug("thread_map__new\n");
356 cpu_set
= CPU_ALLOC(cpus
->nr
);
359 goto out_thread_map_delete
;
361 cpu_set_size
= CPU_ALLOC_SIZE(cpus
->nr
);
362 CPU_ZERO_S(cpu_set_size
, cpu_set
);
364 memset(&attr
, 0, sizeof(attr
));
365 attr
.type
= PERF_TYPE_TRACEPOINT
;
367 evsel
= perf_evsel__new(&attr
, 0);
369 pr_debug("perf_evsel__new\n");
373 if (perf_evsel__open(evsel
, cpus
, threads
) < 0) {
374 pr_debug("failed to open counter: %s, "
375 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
377 goto out_evsel_delete
;
380 for (cpu
= 0; cpu
< cpus
->nr
; ++cpu
) {
381 unsigned int ncalls
= nr_open_calls
+ cpu
;
383 CPU_SET(cpu
, cpu_set
);
384 sched_setaffinity(0, cpu_set_size
, cpu_set
);
385 for (i
= 0; i
< ncalls
; ++i
) {
386 fd
= open("/etc/passwd", O_RDONLY
);
389 CPU_CLR(cpu
, cpu_set
);
393 * Here we need to explicitely preallocate the counts, as if
394 * we use the auto allocation it will allocate just for 1 cpu,
395 * as we start by cpu 0.
397 if (perf_evsel__alloc_counts(evsel
, cpus
->nr
) < 0) {
398 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus
->nr
);
402 for (cpu
= 0; cpu
< cpus
->nr
; ++cpu
) {
403 unsigned int expected
;
405 if (perf_evsel__read_on_cpu(evsel
, cpu
, 0) < 0) {
406 pr_debug("perf_evsel__open_read_on_cpu\n");
410 expected
= nr_open_calls
+ cpu
;
411 if (evsel
->counts
->cpu
[cpu
].val
!= expected
) {
412 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %Ld\n",
413 expected
, cpu
, evsel
->counts
->cpu
[cpu
].val
);
420 perf_evsel__close_fd(evsel
, 1, threads
->nr
);
422 perf_evsel__delete(evsel
);
425 out_thread_map_delete
:
426 thread_map__delete(threads
);
435 .desc
= "vmlinux symtab matches kallsyms",
436 .func
= test__vmlinux_matches_kallsyms
,
439 .desc
= "detect open syscall event",
440 .func
= test__open_syscall_event
,
443 .desc
= "detect open syscall event on all cpus",
444 .func
= test__open_syscall_event_on_all_cpus
,
451 static int __cmd_test(void)
455 page_size
= sysconf(_SC_PAGE_SIZE
);
457 while (tests
[i
].func
) {
459 pr_info("%2d: %s:", i
+ 1, tests
[i
].desc
);
460 pr_debug("\n--- start ---\n");
461 err
= tests
[i
].func();
462 pr_debug("---- end ----\n%s:", tests
[i
].desc
);
463 pr_info(" %s\n", err
? "FAILED!\n" : "Ok");
470 static const char * const test_usage
[] = {
471 "perf test [<options>]",
475 static const struct option test_options
[] = {
476 OPT_INTEGER('v', "verbose", &verbose
,
477 "be more verbose (show symbol address, etc)"),
481 int cmd_test(int argc
, const char **argv
, const char *prefix __used
)
483 argc
= parse_options(argc
, argv
, test_options
, test_usage
, 0);
485 usage_with_options(test_usage
, test_options
);
487 symbol_conf
.priv_size
= sizeof(int);
488 symbol_conf
.sort_by_name
= true;
489 symbol_conf
.try_vmlinux_path
= true;
491 if (symbol__init() < 0)