- 根目录:
- tools
- perf
- builtin-test.c
/*
* builtin-test.c
*
* Builtin regression testing command: ever growing number of sanity tests
*/
#include "builtin.h"
#include "util/cache.h"
#include "util/debug.h"
#include "util/debugfs.h"
#include "util/evlist.h"
#include "util/parse-options.h"
#include "util/parse-events.h"
#include "util/symbol.h"
#include "util/thread_map.h"
#include "../../include/linux/hw_breakpoint.h"
static int vmlinux_matches_kallsyms_filter(struct map *map __used, struct symbol *sym)
{
bool *visited = symbol__priv(sym);
*visited = true;
return 0;
}
static int test__vmlinux_matches_kallsyms(void)
{
int err = -1;
struct rb_node *nd;
struct symbol *sym;
struct map *kallsyms_map, *vmlinux_map;
struct machine kallsyms, vmlinux;
enum map_type type = MAP__FUNCTION;
long page_size = sysconf(_SC_PAGE_SIZE);
struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
/*
* Step 1:
*
* Init the machines that will hold kernel, modules obtained from
* both vmlinux + .ko files and from /proc/kallsyms split by modules.
*/
machine__init(&kallsyms, "", HOST_KERNEL_ID);
machine__init(&vmlinux, "", HOST_KERNEL_ID);
/*
* Step 2:
*
* Create the kernel maps for kallsyms and the DSO where we will then
* load /proc/kallsyms. Also create the modules maps from /proc/modules
* and find the .ko files that match them in /lib/modules/`uname -r`/.
*/
if (machine__create_kernel_maps(&kallsyms) < 0) {
pr_debug("machine__create_kernel_maps ");
return -1;
}
/*
* Step 3:
*
* Load and split /proc/kallsyms into multiple maps, one per module.
*/
if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
pr_debug("dso__load_kallsyms ");
goto out;
}
/*
* Step 4:
*
* kallsyms will be internally on demand sorted by name so that we can
* find the reference relocation * symbol, i.e. the symbol we will use
* to see if the running kernel was relocated by checking if it has the
* same value in the vmlinux file we load.
*/
kallsyms_map = machine__kernel_map(&kallsyms, type);
sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
if (sym == NULL) {
pr_debug("dso__find_symbol_by_name ");
goto out;
}
ref_reloc_sym.addr = sym->start;
/*
* Step 5:
*
* Now repeat step 2, this time for the vmlinux file we'll auto-locate.
*/
if (machine__create_kernel_maps(&vmlinux) < 0) {
pr_debug("machine__create_kernel_maps ");
goto out;
}
vmlinux_map = machine__kernel_map(&vmlinux, type);
map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;
/*
* Step 6:
*
* Locate a vmlinux file in the vmlinux path that has a buildid that
* matches the one of the running kernel.
*
* While doing that look if we find the ref reloc symbol, if we find it
* we'll have its ref_reloc_symbol.unrelocated_addr and then
* maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
* to fixup the symbols.
*/
if (machine__load_vmlinux_path(&vmlinux, type,
vmlinux_matches_kallsyms_filter) <= 0) {
pr_debug("machine__load_vmlinux_path ");
goto out;
}
err = 0;
/*
* Step 7:
*
* Now look at the symbols in the vmlinux DSO and check if we find all of them
* in the kallsyms dso. For the ones that are in both, check its names and
* end addresses too.
*/
for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
struct symbol *pair, *first_pair;
bool backwards = true;
sym = rb_entry(nd, struct symbol, rb_node);
if (sym->start == sym->end)
continue;
first_pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
pair = first_pair;
if (pair && pair->start == sym->start) {
next_pair:
if (strcmp(sym->name, pair->name) == 0) {
/*
* kallsyms don't have the symbol end, so we
* set that by using the next symbol start - 1,
* in some cases we get this up to a page
* wrong, trace_kmalloc when I was developing
* this code was one such example, 2106 bytes
* off the real size. More than that and we
* _really_ have a problem.
*/
s64 skew = sym->end - pair->end;
if (llabs(skew) < page_size)
continue;
pr_debug("%#" PRIx64 ": diff end addr for %s v: %#" PRIx64 " k: %#" PRIx64 "\n",
sym->start, sym->name, sym->end, pair->end);
} else {
struct rb_node *nnd;
detour:
nnd = backwards ? rb_prev(&pair->rb_node) :
rb_next(&pair->rb_node);
if (nnd) {
struct symbol *next = rb_entry(nnd, struct symbol, rb_node);
if (next->start == sym->start) {
pair = next;
goto next_pair;
}
}
if (backwards) {
backwards = false;
pair = first_pair;
goto detour;
}
pr_debug("%#" PRIx64 ": diff name v: %s k: %s\n",
sym->start, sym->name, pair->name);
}
} else
pr_debug("%#" PRIx64 ": %s not on kallsyms\n", sym->start, sym->name);
err = -1;
}
if (!verbose)
goto out;
pr_info("Maps only in vmlinux:\n");
for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
/*
* If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
* the kernel will have the path for the vmlinux file being used,
* so use the short name, less descriptive but the same ("[kernel]" in
* both cases.
*/
pair = map_groups__find_by_name(&kallsyms.kmaps, type,
(pos->dso->kernel ?
pos->dso->short_name :
pos->dso->name));
if (pair)
pair->priv = 1;
else
map__fprintf(pos, stderr);
}
pr_info("Maps in vmlinux with a different name in kallsyms:\n");
for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
if (pair == NULL || pair->priv)
continue;
if (pair->start == pos->start) {
pair->priv = 1;
pr_info(" %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s in kallsyms as",
pos->start, pos->end, pos->pgoff, pos->dso->name);
if (pos->pgoff != pair->pgoff || pos->end != pair->end)
pr_info(": \n*%" PRIx64 "-%" PRIx64 " %" PRIx64 "",
pair->start, pair->end, pair->pgoff);
pr_info(" %s\n", pair->dso->name);
pair->priv = 1;
}
}
pr_info("Maps only in kallsyms:\n");
for (nd = rb_first(&kallsyms.kmaps.maps[type]);
nd; nd = rb_next(nd)) {
struct map *pos = rb_entry(nd, struct map, rb_node);
if (!pos->priv)
map__fprintf(pos, stderr);
}
out:
return err;
}
#include "util/cpumap.h"
#include "util/evsel.h"
#include <sys/types.h>
static int trace_event__id(const char *evname)
{
char *filename;
int err = -1, fd;
if (asprintf(&filename,
"%s/syscalls/%s/id",
tracing_events_path, evname) < 0)
return -1;
fd = open(filename, O_RDONLY);
if (fd >= 0) {
char id[16];
if (read(fd, id, sizeof(id)) > 0)
err = atoi(id);
close(fd);
}
free(filename);
return err;
}
static int test__open_syscall_event(void)
{
int err = -1, fd;
struct thread_map *threads;
struct perf_evsel *evsel;
struct perf_event_attr attr;
unsigned int nr_open_calls = 111, i;
int id = trace_event__id("sys_enter_open");
if (id < 0) {
pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
return -1;
}
threads = thread_map__new(-1, getpid());
if (threads == NULL) {
pr_debug("thread_map__new\n");
return -1;
}
memset(&attr, 0, sizeof(attr));
attr.type = PERF_TYPE_TRACEPOINT;
attr.config = id;
evsel = perf_evsel__new(&attr, 0);
if (evsel == NULL) {
pr_debug("perf_evsel__new\n");
goto out_thread_map_delete;
}
if (perf_evsel__open_per_thread(evsel, threads, false, NULL) < 0) {
pr_debug("failed to open counter: %s, "
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
strerror(errno));
goto out_evsel_delete;
}
for (i = 0; i < nr_open_calls; ++i) {
fd = open("/etc/passwd", O_RDONLY);
close(fd);
}
if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
pr_debug("perf_evsel__read_on_cpu\n");
goto out_close_fd;
}
if (evsel->counts->cpu[0].val != nr_open_calls) {
pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
nr_open_calls, evsel->counts->cpu[0].val);
goto out_close_fd;
}
err = 0;
out_close_fd:
perf_evsel__close_fd(evsel, 1, threads->nr);
out_evsel_delete:
perf_evsel__delete(evsel);
out_thread_map_delete:
thread_map__delete(threads);
return err;
}
#include <sched.h>
static int test__open_syscall_event_on_all_cpus(void)
{
int err = -1, fd, cpu;
struct thread_map *threads;
struct cpu_map *cpus;
struct perf_evsel *evsel;
struct perf_event_attr attr;
unsigned int nr_open_calls = 111, i;
cpu_set_t cpu_set;
int id = trace_event__id("sys_enter_open");
if (id < 0) {
pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
return -1;
}
threads = thread_map__new(-1, getpid());
if (threads == NULL) {
pr_debug("thread_map__new\n");
return -1;
}
cpus = cpu_map__new(NULL);
if (cpus == NULL) {
pr_debug("cpu_map__new\n");
goto out_thread_map_delete;
}
CPU_ZERO(&cpu_set);
memset(&attr, 0, sizeof(attr));
attr.type = PERF_TYPE_TRACEPOINT;
attr.config = id;
evsel = perf_evsel__new(&attr, 0);
if (evsel == NULL) {
pr_debug("perf_evsel__new\n");
goto out_thread_map_delete;
}
if (perf_evsel__open(evsel, cpus, threads, false, NULL) < 0) {
pr_debug("failed to open counter: %s, "
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
strerror(errno));
goto out_evsel_delete;
}
for (cpu = 0; cpu < cpus->nr; ++cpu) {
unsigned int ncalls = nr_open_calls + cpu;
/*
* XXX eventually lift this restriction in a way that
* keeps perf building on older glibc installations
* without CPU_ALLOC. 1024 cpus in 2010 still seems
* a reasonable upper limit tho :-)
*/
if (cpus->map[cpu] >= CPU_SETSIZE) {
pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
continue;
}
CPU_SET(cpus->map[cpu], &cpu_set);
if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
pr_debug("sched_setaffinity() failed on CPU %d: %s ",
cpus->map[cpu],
strerror(errno));
goto out_close_fd;
}
for (i = 0; i < ncalls; ++i) {
fd = open("/etc/passwd", O_RDONLY);
close(fd);
}
CPU_CLR(cpus->map[cpu], &cpu_set);
}
/*
* Here we need to explicitely preallocate the counts, as if
* we use the auto allocation it will allocate just for 1 cpu,
* as we start by cpu 0.
*/
if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) {
pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
goto out_close_fd;
}
err = 0;
for (cpu = 0; cpu < cpus->nr; ++cpu) {
unsigned int expected;
if (cpus->map[cpu] >= CPU_SETSIZE)
continue;
if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
pr_debug("perf_evsel__read_on_cpu\n");
err = -1;
break;
}
expected = nr_open_calls + cpu;
if (evsel->counts->cpu[cpu].val != expected) {
pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
err = -1;
}
}
out_close_fd:
perf_evsel__close_fd(evsel, 1, threads->nr);
out_evsel_delete:
perf_evsel__delete(evsel);
out_thread_map_delete:
thread_map__delete(threads);
return err;
}
/*
* This test will generate random numbers of calls to some getpid syscalls,
* then establish an mmap for a group of events that are created to monitor
* the syscalls.
*
* It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
* sample.id field to map back to its respective perf_evsel instance.
*
* Then it checks if the number of syscalls reported as perf events by
* the kernel corresponds to the number of syscalls made.
*/
static int test__basic_mmap(void)
{
int err = -1;
union perf_event *event;
struct thread_map *threads;
struct cpu_map *cpus;
struct perf_evlist *evlist;
struct perf_event_attr attr = {
.type = PERF_TYPE_TRACEPOINT,
.read_format = PERF_FORMAT_ID,
.sample_type = PERF_SAMPLE_ID,
.watermark = 0,
};
cpu_set_t cpu_set;
const char *syscall_names[] = { "getsid", "getppid", "getpgrp",
"getpgid", };
pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
(void*)getpgid };
#define nsyscalls ARRAY_SIZE(syscall_names)
int ids[nsyscalls];
unsigned int nr_events[nsyscalls],
expected_nr_events[nsyscalls], i, j;
struct perf_evsel *evsels[nsyscalls], *evsel;
int sample_size = __perf_evsel__sample_size(attr.sample_type);
for (i = 0; i < nsyscalls; ++i) {
char name[64];
snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
ids[i] = trace_event__id(name);
if (ids[i] < 0) {
pr_debug("Is debugfs mounted on /sys/kernel/debug?\n");
return -1;
}
nr_events[i] = 0;
expected_nr_events[i] = random() % 257;
}
threads = thread_map__new(-1, getpid());
if (threads == NULL) {
pr_debug("thread_map__new\n");
return -1;
}
cpus = cpu_map__new(NULL);
if (cpus == NULL) {
pr_debug("cpu_map__new\n");
goto out_free_threads;
}
CPU_ZERO(&cpu_set);
CPU_SET(cpus->map[0], &cpu_set);
sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
pr_debug("sched_setaffinity() failed on CPU %d: %s ",
cpus->map[0], strerror(errno));
goto out_free_cpus;
}
evlist = perf_evlist__new(cpus, threads);
if (evlist == NULL) {
pr_debug("perf_evlist__new\n");
goto out_free_cpus;
}
/* anonymous union fields, can't be initialized above */
attr.wakeup_events = 1;
attr.sample_period = 1;
for (i = 0; i < nsyscalls; ++i) {
attr.config = ids[i];
evsels[i] = perf_evsel__new(&attr, i);
if (evsels[i] == NULL) {
pr_debug("perf_evsel__new\n");
goto out_free_evlist;
}
perf_evlist__add(evlist, evsels[i]);
if (perf_evsel__open(evsels[i], cpus, threads, false, NULL) < 0) {
pr_debug("failed to open counter: %s, "
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
strerror(errno));
goto out_close_fd;
}
}
if (perf_evlist__mmap(evlist, 128, true) < 0) {
pr_debug("failed to mmap events: %d (%s)\n", errno,
strerror(errno));
goto out_close_fd;
}
for (i = 0; i < nsyscalls; ++i)
for (j = 0; j < expected_nr_events[i]; ++j) {
int foo = syscalls[i]();
++foo;
}
while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
struct perf_sample sample;
if (event->header.type != PERF_RECORD_SAMPLE) {
pr_debug("unexpected %s event\n",
perf_event__name(event->header.type));
goto out_munmap;
}
err = perf_event__parse_sample(event, attr.sample_type, sample_size,
false, &sample, false);
if (err) {
pr_err("Can't parse sample, err = %d\n", err);
goto out_munmap;
}
evsel = perf_evlist__id2evsel(evlist, sample.id);
if (evsel == NULL) {
pr_debug("event with id %" PRIu64
" doesn't map to an evsel\n", sample.id);
goto out_munmap;
}
nr_events[evsel->idx]++;
}
list_for_each_entry(evsel, &evlist->entries, node) {
if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
pr_debug("expected %d %s events, got %d\n",
expected_nr_events[evsel->idx],
event_name(evsel), nr_events[evsel->idx]);
goto out_munmap;
}
}
err = 0;
out_munmap:
perf_evlist__munmap(evlist);
out_close_fd:
for (i = 0; i < nsyscalls; ++i)
perf_evsel__close_fd(evsels[i], 1, threads->nr);
out_free_evlist:
perf_evlist__delete(evlist);
out_free_cpus:
cpu_map__delete(cpus);
out_free_threads:
thread_map__delete(threads);
return err;
#undef nsyscalls
}
#define TEST_ASSERT_VAL(text, cond) \
do { \
if (!(cond)) { \
pr_debug("FAILED %s:%d %s\n", __FILE__, __LINE__, text); \
return -1; \
} \
} while (0)
static int test__checkevent_tracepoint(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type", PERF_TYPE_TRACEPOINT == evsel->attr.type);
TEST_ASSERT_VAL("wrong sample_type",
(PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | PERF_SAMPLE_CPU) ==
evsel->attr.sample_type);
TEST_ASSERT_VAL("wrong sample_period", 1 == evsel->attr.sample_period);
return 0;
}
static int test__checkevent_tracepoint_multi(struct perf_evlist *evlist)
{
struct perf_evsel *evsel;
TEST_ASSERT_VAL("wrong number of entries", evlist->nr_entries > 1);
list_for_each_entry(evsel, &evlist->entries, node) {
TEST_ASSERT_VAL("wrong type",
PERF_TYPE_TRACEPOINT == evsel->attr.type);
TEST_ASSERT_VAL("wrong sample_type",
(PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | PERF_SAMPLE_CPU)
== evsel->attr.sample_type);
TEST_ASSERT_VAL("wrong sample_period",
1 == evsel->attr.sample_period);
}
return 0;
}
static int test__checkevent_raw(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type", PERF_TYPE_RAW == evsel->attr.type);
TEST_ASSERT_VAL("wrong config", 1 == evsel->attr.config);
return 0;
}
static int test__checkevent_numeric(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type", 1 == evsel->attr.type);
TEST_ASSERT_VAL("wrong config", 1 == evsel->attr.config);
return 0;
}
static int test__checkevent_symbolic_name(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->attr.type);
TEST_ASSERT_VAL("wrong config",
PERF_COUNT_HW_INSTRUCTIONS == evsel->attr.config);
return 0;
}
static int test__checkevent_symbolic_alias(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type", PERF_TYPE_SOFTWARE == evsel->attr.type);
TEST_ASSERT_VAL("wrong config",
PERF_COUNT_SW_PAGE_FAULTS == evsel->attr.config);
return 0;
}
static int test__checkevent_genhw(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type", PERF_TYPE_HW_CACHE == evsel->attr.type);
TEST_ASSERT_VAL("wrong config", (1 << 16) == evsel->attr.config);
return 0;
}
static int test__checkevent_breakpoint(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type", PERF_TYPE_BREAKPOINT == evsel->attr.type);
TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
TEST_ASSERT_VAL("wrong bp_type", (HW_BREAKPOINT_R | HW_BREAKPOINT_W) ==
evsel->attr.bp_type);
TEST_ASSERT_VAL("wrong bp_len", HW_BREAKPOINT_LEN_4 ==
evsel->attr.bp_len);
return 0;
}
static int test__checkevent_breakpoint_x(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type", PERF_TYPE_BREAKPOINT == evsel->attr.type);
TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
TEST_ASSERT_VAL("wrong bp_type",
HW_BREAKPOINT_X == evsel->attr.bp_type);
TEST_ASSERT_VAL("wrong bp_len", sizeof(long) == evsel->attr.bp_len);
return 0;
}
static int test__checkevent_breakpoint_r(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type",
PERF_TYPE_BREAKPOINT == evsel->attr.type);
TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
TEST_ASSERT_VAL("wrong bp_type",
HW_BREAKPOINT_R == evsel->attr.bp_type);
TEST_ASSERT_VAL("wrong bp_len",
HW_BREAKPOINT_LEN_4 == evsel->attr.bp_len);
return 0;
}
static int test__checkevent_breakpoint_w(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
TEST_ASSERT_VAL("wrong type",
PERF_TYPE_BREAKPOINT == evsel->attr.type);
TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
TEST_ASSERT_VAL("wrong bp_type",
HW_BREAKPOINT_W == evsel->attr.bp_type);
TEST_ASSERT_VAL("wrong bp_len",
HW_BREAKPOINT_LEN_4 == evsel->attr.bp_len);
return 0;
}
static int test__checkevent_tracepoint_modifier(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->attr.exclude_kernel);
TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
return test__checkevent_tracepoint(evlist);
}
static int
test__checkevent_tracepoint_multi_modifier(struct perf_evlist *evlist)
{
struct perf_evsel *evsel;
TEST_ASSERT_VAL("wrong number of entries", evlist->nr_entries > 1);
list_for_each_entry(evsel, &evlist->entries, node) {
TEST_ASSERT_VAL("wrong exclude_user",
!evsel->attr.exclude_user);
TEST_ASSERT_VAL("wrong exclude_kernel",
evsel->attr.exclude_kernel);
TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
}
return test__checkevent_tracepoint_multi(evlist);
}
static int test__checkevent_raw_modifier(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->attr.exclude_kernel);
TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
return test__checkevent_raw(evlist);
}
static int test__checkevent_numeric_modifier(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
TEST_ASSERT_VAL("wrong exclude_hv", !evsel->attr.exclude_hv);
TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
return test__checkevent_numeric(evlist);
}
static int test__checkevent_symbolic_name_modifier(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
TEST_ASSERT_VAL("wrong exclude_hv", !evsel->attr.exclude_hv);
TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
return test__checkevent_symbolic_name(evlist);
}
static int test__checkevent_symbolic_alias_modifier(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong exclude_user", !evsel->attr.exclude_user);
TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
return test__checkevent_symbolic_alias(evlist);
}
static int test__checkevent_genhw_modifier(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = list_entry(evlist->entries.next,
struct perf_evsel, node);
TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->attr.exclude_kernel);
TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
return test__checkevent_genhw(evlist);
}
static struct test__event_st {
const char *name;
__u32 type;
int (*check)(struct perf_evlist *evlist);
} test__events[] = {
{
.name = "syscalls:sys_enter_open",
.check = test__checkevent_tracepoint,
},
{
.name = "syscalls:*",
.check = test__checkevent_tracepoint_multi,
},
{
.name = "r1",
.check = test__checkevent_raw,
},
{
.name = "1:1",
.check = test__checkevent_numeric,
},
{
.name = "instructions",
.check = test__checkevent_symbolic_name,
},
{
.name = "faults",
.check = test__checkevent_symbolic_alias,
},
{
.name = "L1-dcache-load-miss",
.check = test__checkevent_genhw,
},
{
.name = "mem:0",
.check = test__checkevent_breakpoint,
},
{
.name = "mem:0:x",
.check = test__checkevent_breakpoint_x,
},
{
.name = "mem:0:r",
.check = test__checkevent_breakpoint_r,
},
{
.name = "mem:0:w",
.check = test__checkevent_breakpoint_w,
},
{
.name = "syscalls:sys_enter_open:k",
.check = test__checkevent_tracepoint_modifier,
},
{
.name = "syscalls:*:u",
.check = test__checkevent_tracepoint_multi_modifier,
},
{
.name = "r1:kp",
.check = test__checkevent_raw_modifier,
},
{
.name = "1:1:hp",
.check = test__checkevent_numeric_modifier,
},
{
.name = "instructions:h",
.check = test__checkevent_symbolic_name_modifier,
},
{
.name = "faults:u",
.check = test__checkevent_symbolic_alias_modifier,
},
{
.name = "L1-dcache-load-miss:kp",
.check = test__checkevent_genhw_modifier,
},
};
#define TEST__EVENTS_CNT (sizeof(test__events) / sizeof(struct test__event_st))
static int test__parse_events(void)
{
struct perf_evlist *evlist;
u_int i;
int ret = 0;
for (i = 0; i < TEST__EVENTS_CNT; i++) {
struct test__event_st *e = &test__events[i];
evlist = perf_evlist__new(NULL, NULL);
if (evlist == NULL)
break;
ret = parse_events(evlist, e->name, 0);
if (ret) {
pr_debug("failed to parse event '%s', err %d\n",
e->name, ret);
break;
}
ret = e->check(evlist);
if (ret)
break;
perf_evlist__delete(evlist);
}
return ret;
}
static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t **maskp,
size_t *sizep)
{
cpu_set_t *mask;
size_t size;
int i, cpu = -1, nrcpus = 1024;
realloc:
mask = CPU_ALLOC(nrcpus);
size = CPU_ALLOC_SIZE(nrcpus);
CPU_ZERO_S(size, mask);
if (sched_getaffinity(pid, size, mask) == -1) {
CPU_FREE(mask);
if (errno == EINVAL && nrcpus < (1024 << 8)) {
nrcpus = nrcpus << 2;
goto realloc;
}
perror("sched_getaffinity");
return -1;
}
for (i = 0; i < nrcpus; i++) {
if (CPU_ISSET_S(i, size, mask)) {
if (cpu == -1) {
cpu = i;
*maskp = mask;
*sizep = size;
} else
CPU_CLR_S(i, size, mask);
}
}
if (cpu == -1)
CPU_FREE(mask);
return cpu;
}
static int test__PERF_RECORD(void)
{
struct perf_record_opts opts = {
.target_pid = -1,
.target_tid = -1,
.no_delay = true,
.freq = 10,
.mmap_pages = 256,
.sample_id_all_avail = true,
};
cpu_set_t *cpu_mask = NULL;
size_t cpu_mask_size = 0;
struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
struct perf_evsel *evsel;
struct perf_sample sample;
const char *cmd = "sleep";
const char *argv[] = { cmd, "1", NULL, };
char *bname;
u64 sample_type, prev_time = 0;
bool found_cmd_mmap = false,
found_libc_mmap = false,
found_vdso_mmap = false,
found_ld_mmap = false;
int err = -1, errs = 0, i, wakeups = 0, sample_size;
u32 cpu;
int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
if (evlist == NULL || argv == NULL) {
pr_debug("Not enough memory to create evlist\n");
goto out;
}
/*
* We need at least one evsel in the evlist, use the default
* one: "cycles".
*/
err = perf_evlist__add_default(evlist);
if (err < 0) {
pr_debug("Not enough memory to create evsel\n");
goto out_delete_evlist;
}
/*
* Create maps of threads and cpus to monitor. In this case
* we start with all threads and cpus (-1, -1) but then in
* perf_evlist__prepare_workload we'll fill in the only thread
* we're monitoring, the one forked there.
*/
err = perf_evlist__create_maps(evlist, opts.target_pid,
opts.target_tid, opts.cpu_list);
if (err < 0) {
pr_debug("Not enough memory to create thread/cpu maps\n");
goto out_delete_evlist;
}
/*
* Prepare the workload in argv[] to run, it'll fork it, and then wait
* for perf_evlist__start_workload() to exec it. This is done this way
* so that we have time to open the evlist (calling sys_perf_event_open
* on all the fds) and then mmap them.
*/
err = perf_evlist__prepare_workload(evlist, &opts, argv);
if (err < 0) {
pr_debug("Couldn't run the workload!\n");
goto out_delete_evlist;
}
/*
* Config the evsels, setting attr->comm on the first one, etc.
*/
evsel = list_entry(evlist->entries.next, struct perf_evsel, node);
evsel->attr.sample_type |= PERF_SAMPLE_CPU;
evsel->attr.sample_type |= PERF_SAMPLE_TID;
evsel->attr.sample_type |= PERF_SAMPLE_TIME;
perf_evlist__config_attrs(evlist, &opts);
err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask,
&cpu_mask_size);
if (err < 0) {
pr_debug("sched__get_first_possible_cpu: %s\n", strerror(errno));
goto out_delete_evlist;
}
cpu = err;
/*
* So that we can check perf_sample.cpu on all the samples.
*/
if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, cpu_mask) < 0) {
pr_debug("sched_setaffinity: %s\n", strerror(errno));
goto out_free_cpu_mask;
}
/*
* Call sys_perf_event_open on all the fds on all the evsels,
* grouping them if asked to.
*/
err = perf_evlist__open(evlist, opts.group);
if (err < 0) {
pr_debug("perf_evlist__open: %s\n", strerror(errno));
goto out_delete_evlist;
}
/*
* mmap the first fd on a given CPU and ask for events for the other
* fds in the same CPU to be injected in the same mmap ring buffer
* (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
*/
err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
if (err < 0) {
pr_debug("perf_evlist__mmap: %s\n", strerror(errno));
goto out_delete_evlist;
}
/*
* We'll need these two to parse the PERF_SAMPLE_* fields in each
* event.
*/
sample_type = perf_evlist__sample_type(evlist);
sample_size = __perf_evsel__sample_size(sample_type);
/*
* Now that all is properly set up, enable the events, they will
* count just on workload.pid, which will start...
*/
perf_evlist__enable(evlist);
/*
* Now!
*/
perf_evlist__start_workload(evlist);
while (1) {
int before = total_events;
for (i = 0; i < evlist->nr_mmaps; i++) {
union perf_event *event;
while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
const u32 type = event->header.type;
const char *name = perf_event__name(type);
++total_events;
if (type < PERF_RECORD_MAX)
nr_events[type]++;
err = perf_event__parse_sample(event, sample_type,
sample_size, true,
&sample, false);
if (err < 0) {
if (verbose)
perf_event__fprintf(event, stderr);
pr_debug("Couldn't parse sample\n");
goto out_err;
}
if (verbose) {
pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
perf_event__fprintf(event, stderr);
}
if (prev_time > sample.time) {
pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
name, prev_time, sample.time);
++errs;
}
prev_time = sample.time;
if (sample.cpu != cpu) {
pr_debug("%s with unexpected cpu, expected %d, got %d\n",
name, cpu, sample.cpu);
++errs;
}
if ((pid_t)sample.pid != evlist->workload.pid) {
pr_debug("%s with unexpected pid, expected %d, got %d\n",
name, evlist->workload.pid, sample.pid);
++errs;
}
if ((pid_t)sample.tid != evlist->workload.pid) {
pr_debug("%s with unexpected tid, expected %d, got %d\n",
name, evlist->workload.pid, sample.tid);
++errs;
}
if ((type == PERF_RECORD_COMM ||
type == PERF_RECORD_MMAP ||
type == PERF_RECORD_FORK ||
type == PERF_RECORD_EXIT) &&
(pid_t)event->comm.pid != evlist->workload.pid) {
pr_debug("%s with unexpected pid/tid\n", name);
++errs;
}
if ((type == PERF_RECORD_COMM ||
type == PERF_RECORD_MMAP) &&
event->comm.pid != event->comm.tid) {
pr_debug("%s with different pid/tid!\n", name);
++errs;
}
switch (type) {
case PERF_RECORD_COMM:
if (strcmp(event->comm.comm, cmd)) {
pr_debug("%s with unexpected comm!\n", name);
++errs;
}
break;
case PERF_RECORD_EXIT:
goto found_exit;
case PERF_RECORD_MMAP:
bname = strrchr(event->mmap.filename, '/');
if (bname != NULL) {
if (!found_cmd_mmap)
found_cmd_mmap = !strcmp(bname + 1, cmd);
if (!found_libc_mmap)
found_libc_mmap = !strncmp(bname + 1, "libc", 4);
if (!found_ld_mmap)
found_ld_mmap = !strncmp(bname + 1, "ld", 2);
} else if (!found_vdso_mmap)
found_vdso_mmap = !strcmp(event->mmap.filename, "[vdso]");
break;
case PERF_RECORD_SAMPLE:
/* Just ignore samples for now */
break;
default:
pr_debug("Unexpected perf_event->header.type %d!\n",
type);
++errs;
}
}
}
/*
* We don't use poll here because at least at 3.1 times the
* PERF_RECORD_{!SAMPLE} events don't honour
* perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
*/
if (total_events == before && false)
poll(evlist->pollfd, evlist->nr_fds, -1);
sleep(1);
if (++wakeups > 5) {
pr_debug("No PERF_RECORD_EXIT event!\n");
break;
}
}
found_exit:
if (nr_events[PERF_RECORD_COMM] > 1) {
pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
++errs;
}
if (nr_events[PERF_RECORD_COMM] == 0) {
pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
++errs;
}
if (!found_cmd_mmap) {
pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
++errs;
}
if (!found_libc_mmap) {
pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
++errs;
}
if (!found_ld_mmap) {
pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
++errs;
}
if (!found_vdso_mmap) {
pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
++errs;
}
out_err:
perf_evlist__munmap(evlist);
out_free_cpu_mask:
CPU_FREE(cpu_mask);
out_delete_evlist:
perf_evlist__delete(evlist);
out:
return (err < 0 || errs > 0) ? -1 : 0;
}
static struct test {
const char *desc;
int (*func)(void);
} tests[] = {
{
.desc = "vmlinux symtab matches kallsyms",
.func = test__vmlinux_matches_kallsyms,
},
{
.desc = "detect open syscall event",
.func = test__open_syscall_event,
},
{
.desc = "detect open syscall event on all cpus",
.func = test__open_syscall_event_on_all_cpus,
},
{
.desc = "read samples using the mmap interface",
.func = test__basic_mmap,
},
{
.desc = "parse events tests",
.func = test__parse_events,
},
{
.desc = "Validate PERF_RECORD_* events & perf_sample fields",
.func = test__PERF_RECORD,
},
{
.func = NULL,
},
};
static bool perf_test__matches(int curr, int argc, const char *argv[])
{
int i;
if (argc == 0)
return true;
for (i = 0; i < argc; ++i) {
char *end;
long nr = strtoul(argv[i], &end, 10);
if (*end == '\0') {
if (nr == curr + 1)
return true;
continue;
}
if (strstr(tests[curr].desc, argv[i]))
return true;
}
return false;
}
static int __cmd_test(int argc, const char *argv[])
{
int i = 0;
while (tests[i].func) {
int curr = i++, err;
if (!perf_test__matches(curr, argc, argv))
continue;
pr_info("%2d: %s:", i, tests[curr].desc);
pr_debug("\n--- start ---\n");
err = tests[curr].func();
pr_debug("---- end ----\n%s:", tests[curr].desc);
pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
}
return 0;
}
static int perf_test__list(int argc, const char **argv)
{
int i = 0;
while (tests[i].func) {
int curr = i++;
if (argc > 1 && !strstr(tests[curr].desc, argv[1]))
continue;
pr_info("%2d: %s\n", i, tests[curr].desc);
}
return 0;
}
int cmd_test(int argc, const char **argv, const char *prefix __used)
{
const char * const test_usage[] = {
"perf test [<options>] [{list <test-name-fragment>|[<test-name-fragments>|<test-numbers>]}]",
NULL,
};
const struct option test_options[] = {
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show symbol address, etc)"),
OPT_END()
};
argc = parse_options(argc, argv, test_options, test_usage, 0);
if (argc >= 1 && !strcmp(argv[0], "list"))
return perf_test__list(argc, argv);
symbol_conf.priv_size = sizeof(int);
symbol_conf.sort_by_name = true;
symbol_conf.try_vmlinux_path = true;
if (symbol__init() < 0)
return -1;
setup_pager();
return __cmd_test(argc, argv);
}