508 lines
12 KiB
C
508 lines
12 KiB
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/parse-options.h"
|
|
#include "util/session.h"
|
|
#include "util/symbol.h"
|
|
#include "util/thread.h"
|
|
|
|
static long page_size;
|
|
|
|
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;
|
|
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 *event_name)
|
|
{
|
|
char *filename;
|
|
int err = -1, fd;
|
|
|
|
if (asprintf(&filename,
|
|
"/sys/kernel/debug/tracing/events/syscalls/%s/id",
|
|
event_name) < 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) < 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__open_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 (threads == NULL) {
|
|
pr_debug("thread_map__new\n");
|
|
return -1;
|
|
}
|
|
|
|
|
|
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) < 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;
|
|
}
|
|
|
|
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__open_read_on_cpu\n");
|
|
goto out_close_fd;
|
|
}
|
|
|
|
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);
|
|
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;
|
|
}
|
|
|
|
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,
|
|
},
|
|
{
|
|
.func = NULL,
|
|
},
|
|
};
|
|
|
|
static int __cmd_test(void)
|
|
{
|
|
int i = 0;
|
|
|
|
page_size = sysconf(_SC_PAGE_SIZE);
|
|
|
|
while (tests[i].func) {
|
|
int err;
|
|
pr_info("%2d: %s:", i + 1, tests[i].desc);
|
|
pr_debug("\n--- start ---\n");
|
|
err = tests[i].func();
|
|
pr_debug("---- end ----\n%s:", tests[i].desc);
|
|
pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
|
|
++i;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char * const test_usage[] = {
|
|
"perf test [<options>]",
|
|
NULL,
|
|
};
|
|
|
|
static const struct option test_options[] = {
|
|
OPT_INTEGER('v', "verbose", &verbose,
|
|
"be more verbose (show symbol address, etc)"),
|
|
OPT_END()
|
|
};
|
|
|
|
int cmd_test(int argc, const char **argv, const char *prefix __used)
|
|
{
|
|
argc = parse_options(argc, argv, test_options, test_usage, 0);
|
|
if (argc)
|
|
usage_with_options(test_usage, test_options);
|
|
|
|
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();
|
|
}
|