perf tests: Add a sample parsing test

Add a test that checks that sample parsing is correctly implemented.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1377591794-30553-12-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2013-08-27 11:23:13 +03:00 committed by Arnaldo Carvalho de Melo
parent b1cf6f65aa
commit 045f8cd854
4 changed files with 322 additions and 0 deletions

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@ -439,6 +439,7 @@ PERFLIBS = $(LIB_FILE) $(LIBLK) $(LIBTRACEEVENT)
ifneq ($(OUTPUT),)
CFLAGS += -I$(OUTPUT)
endif
LIB_OBJS += $(OUTPUT)tests/sample-parsing.o
ifdef NO_LIBELF
EXTLIBS := $(filter-out -lelf,$(EXTLIBS))

View File

@ -103,6 +103,10 @@ static struct test {
.desc = "Test object code reading",
.func = test__code_reading,
},
{
.desc = "Test sample parsing",
.func = test__sample_parsing,
},
{
.func = NULL,
},

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@ -0,0 +1,316 @@
#include <stdbool.h>
#include <inttypes.h>
#include "util.h"
#include "event.h"
#include "evsel.h"
#include "tests.h"
#define COMP(m) do { \
if (s1->m != s2->m) { \
pr_debug("Samples differ at '"#m"'\n"); \
return false; \
} \
} while (0)
#define MCOMP(m) do { \
if (memcmp(&s1->m, &s2->m, sizeof(s1->m))) { \
pr_debug("Samples differ at '"#m"'\n"); \
return false; \
} \
} while (0)
static bool samples_same(const struct perf_sample *s1,
const struct perf_sample *s2, u64 type, u64 regs_user,
u64 read_format)
{
size_t i;
if (type & PERF_SAMPLE_IDENTIFIER)
COMP(id);
if (type & PERF_SAMPLE_IP)
COMP(ip);
if (type & PERF_SAMPLE_TID) {
COMP(pid);
COMP(tid);
}
if (type & PERF_SAMPLE_TIME)
COMP(time);
if (type & PERF_SAMPLE_ADDR)
COMP(addr);
if (type & PERF_SAMPLE_ID)
COMP(id);
if (type & PERF_SAMPLE_STREAM_ID)
COMP(stream_id);
if (type & PERF_SAMPLE_CPU)
COMP(cpu);
if (type & PERF_SAMPLE_PERIOD)
COMP(period);
if (type & PERF_SAMPLE_READ) {
if (read_format & PERF_FORMAT_GROUP)
COMP(read.group.nr);
else
COMP(read.one.value);
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
COMP(read.time_enabled);
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
COMP(read.time_running);
/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
if (read_format & PERF_FORMAT_GROUP) {
for (i = 0; i < s1->read.group.nr; i++)
MCOMP(read.group.values[i]);
} else {
COMP(read.one.id);
}
}
if (type & PERF_SAMPLE_CALLCHAIN) {
COMP(callchain->nr);
for (i = 0; i < s1->callchain->nr; i++)
COMP(callchain->ips[i]);
}
if (type & PERF_SAMPLE_RAW) {
COMP(raw_size);
if (memcmp(s1->raw_data, s2->raw_data, s1->raw_size)) {
pr_debug("Samples differ at 'raw_data'\n");
return false;
}
}
if (type & PERF_SAMPLE_BRANCH_STACK) {
COMP(branch_stack->nr);
for (i = 0; i < s1->branch_stack->nr; i++)
MCOMP(branch_stack->entries[i]);
}
if (type & PERF_SAMPLE_REGS_USER) {
size_t sz = hweight_long(regs_user) * sizeof(u64);
COMP(user_regs.abi);
if (s1->user_regs.abi &&
(!s1->user_regs.regs || !s2->user_regs.regs ||
memcmp(s1->user_regs.regs, s2->user_regs.regs, sz))) {
pr_debug("Samples differ at 'user_regs'\n");
return false;
}
}
if (type & PERF_SAMPLE_STACK_USER) {
COMP(user_stack.size);
if (memcmp(s1->user_stack.data, s1->user_stack.data,
s1->user_stack.size)) {
pr_debug("Samples differ at 'user_stack'\n");
return false;
}
}
if (type & PERF_SAMPLE_WEIGHT)
COMP(weight);
if (type & PERF_SAMPLE_DATA_SRC)
COMP(data_src);
return true;
}
static int do_test(u64 sample_type, u64 sample_regs_user, u64 read_format)
{
struct perf_evsel evsel = {
.needs_swap = false,
.attr = {
.sample_type = sample_type,
.sample_regs_user = sample_regs_user,
.read_format = read_format,
},
};
union perf_event *event;
union {
struct ip_callchain callchain;
u64 data[64];
} callchain = {
/* 3 ips */
.data = {3, 201, 202, 203},
};
union {
struct branch_stack branch_stack;
u64 data[64];
} branch_stack = {
/* 1 branch_entry */
.data = {1, 211, 212, 213},
};
u64 user_regs[64];
const u64 raw_data[] = {0x123456780a0b0c0dULL, 0x1102030405060708ULL};
const u64 data[] = {0x2211443366558877ULL, 0, 0xaabbccddeeff4321ULL};
struct perf_sample sample = {
.ip = 101,
.pid = 102,
.tid = 103,
.time = 104,
.addr = 105,
.id = 106,
.stream_id = 107,
.period = 108,
.weight = 109,
.cpu = 110,
.raw_size = sizeof(raw_data),
.data_src = 111,
.raw_data = (void *)raw_data,
.callchain = &callchain.callchain,
.branch_stack = &branch_stack.branch_stack,
.user_regs = {
.abi = PERF_SAMPLE_REGS_ABI_64,
.regs = user_regs,
},
.user_stack = {
.size = sizeof(data),
.data = (void *)data,
},
.read = {
.time_enabled = 0x030a59d664fca7deULL,
.time_running = 0x011b6ae553eb98edULL,
},
};
struct sample_read_value values[] = {{1, 5}, {9, 3}, {2, 7}, {6, 4},};
struct perf_sample sample_out;
size_t i, sz, bufsz;
int err, ret = -1;
for (i = 0; i < sizeof(user_regs); i++)
*(i + (u8 *)user_regs) = i & 0xfe;
if (read_format & PERF_FORMAT_GROUP) {
sample.read.group.nr = 4;
sample.read.group.values = values;
} else {
sample.read.one.value = 0x08789faeb786aa87ULL;
sample.read.one.id = 99;
}
sz = perf_event__sample_event_size(&sample, sample_type,
sample_regs_user, read_format);
bufsz = sz + 4096; /* Add a bit for overrun checking */
event = malloc(bufsz);
if (!event) {
pr_debug("malloc failed\n");
return -1;
}
memset(event, 0xff, bufsz);
event->header.type = PERF_RECORD_SAMPLE;
event->header.misc = 0;
event->header.size = sz;
err = perf_event__synthesize_sample(event, sample_type,
sample_regs_user, read_format,
&sample, false);
if (err) {
pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
"perf_event__synthesize_sample", sample_type, err);
goto out_free;
}
/* The data does not contain 0xff so we use that to check the size */
for (i = bufsz; i > 0; i--) {
if (*(i - 1 + (u8 *)event) != 0xff)
break;
}
if (i != sz) {
pr_debug("Event size mismatch: actual %zu vs expected %zu\n",
i, sz);
goto out_free;
}
evsel.sample_size = __perf_evsel__sample_size(sample_type);
err = perf_evsel__parse_sample(&evsel, event, &sample_out);
if (err) {
pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
"perf_evsel__parse_sample", sample_type, err);
goto out_free;
}
if (!samples_same(&sample, &sample_out, sample_type,
sample_regs_user, read_format)) {
pr_debug("parsing failed for sample_type %#"PRIx64"\n",
sample_type);
goto out_free;
}
ret = 0;
out_free:
free(event);
if (ret && read_format)
pr_debug("read_format %#"PRIx64"\n", read_format);
return ret;
}
/**
* test__sample_parsing - test sample parsing.
*
* This function implements a test that synthesizes a sample event, parses it
* and then checks that the parsed sample matches the original sample. The test
* checks sample format bits separately and together. If the test passes %0 is
* returned, otherwise %-1 is returned.
*/
int test__sample_parsing(void)
{
const u64 rf[] = {4, 5, 6, 7, 12, 13, 14, 15};
u64 sample_type;
u64 sample_regs_user;
size_t i;
int err;
/*
* Fail the test if it has not been updated when new sample format bits
* were added.
*/
if (PERF_SAMPLE_MAX > PERF_SAMPLE_IDENTIFIER << 1) {
pr_debug("sample format has changed - test needs updating\n");
return -1;
}
/* Test each sample format bit separately */
for (sample_type = 1; sample_type != PERF_SAMPLE_MAX;
sample_type <<= 1) {
/* Test read_format variations */
if (sample_type == PERF_SAMPLE_READ) {
for (i = 0; i < ARRAY_SIZE(rf); i++) {
err = do_test(sample_type, 0, rf[i]);
if (err)
return err;
}
continue;
}
if (sample_type == PERF_SAMPLE_REGS_USER)
sample_regs_user = 0x3fff;
else
sample_regs_user = 0;
err = do_test(sample_type, sample_regs_user, 0);
if (err)
return err;
}
/* Test all sample format bits together */
sample_type = PERF_SAMPLE_MAX - 1;
sample_regs_user = 0x3fff;
for (i = 0; i < ARRAY_SIZE(rf); i++) {
err = do_test(sample_type, sample_regs_user, rf[i]);
if (err)
return err;
}
return 0;
}

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@ -37,5 +37,6 @@ int test__task_exit(void);
int test__sw_clock_freq(void);
int test__perf_time_to_tsc(void);
int test__code_reading(void);
int test__sample_parsing(void);
#endif /* TESTS_H */