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-rw-r--r--tools/perf/tests/hists_link.c342
1 files changed, 342 insertions, 0 deletions
diff --git a/tools/perf/tests/hists_link.c b/tools/perf/tests/hists_link.c
new file mode 100644
index 000000000..9a9d06cb0
--- /dev/null
+++ b/tools/perf/tests/hists_link.c
@@ -0,0 +1,342 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "perf.h"
+#include "tests.h"
+#include "debug.h"
+#include "symbol.h"
+#include "sort.h"
+#include "evsel.h"
+#include "evlist.h"
+#include "machine.h"
+#include "thread.h"
+#include "parse-events.h"
+#include "hists_common.h"
+#include <errno.h>
+#include <linux/kernel.h>
+
+struct sample {
+ u32 pid;
+ u64 ip;
+ struct thread *thread;
+ struct map *map;
+ struct symbol *sym;
+};
+
+/* For the numbers, see hists_common.c */
+static struct sample fake_common_samples[] = {
+ /* perf [kernel] schedule() */
+ { .pid = FAKE_PID_PERF1, .ip = FAKE_IP_KERNEL_SCHEDULE, },
+ /* perf [perf] main() */
+ { .pid = FAKE_PID_PERF2, .ip = FAKE_IP_PERF_MAIN, },
+ /* perf [perf] cmd_record() */
+ { .pid = FAKE_PID_PERF2, .ip = FAKE_IP_PERF_CMD_RECORD, },
+ /* bash [bash] xmalloc() */
+ { .pid = FAKE_PID_BASH, .ip = FAKE_IP_BASH_XMALLOC, },
+ /* bash [libc] malloc() */
+ { .pid = FAKE_PID_BASH, .ip = FAKE_IP_LIBC_MALLOC, },
+};
+
+static struct sample fake_samples[][5] = {
+ {
+ /* perf [perf] run_command() */
+ { .pid = FAKE_PID_PERF1, .ip = FAKE_IP_PERF_RUN_COMMAND, },
+ /* perf [libc] malloc() */
+ { .pid = FAKE_PID_PERF1, .ip = FAKE_IP_LIBC_MALLOC, },
+ /* perf [kernel] page_fault() */
+ { .pid = FAKE_PID_PERF1, .ip = FAKE_IP_KERNEL_PAGE_FAULT, },
+ /* perf [kernel] sys_perf_event_open() */
+ { .pid = FAKE_PID_PERF2, .ip = FAKE_IP_KERNEL_SYS_PERF_EVENT_OPEN, },
+ /* bash [libc] free() */
+ { .pid = FAKE_PID_BASH, .ip = FAKE_IP_LIBC_FREE, },
+ },
+ {
+ /* perf [libc] free() */
+ { .pid = FAKE_PID_PERF2, .ip = FAKE_IP_LIBC_FREE, },
+ /* bash [libc] malloc() */
+ { .pid = FAKE_PID_BASH, .ip = FAKE_IP_LIBC_MALLOC, }, /* will be merged */
+ /* bash [bash] xfee() */
+ { .pid = FAKE_PID_BASH, .ip = FAKE_IP_BASH_XFREE, },
+ /* bash [libc] realloc() */
+ { .pid = FAKE_PID_BASH, .ip = FAKE_IP_LIBC_REALLOC, },
+ /* bash [kernel] page_fault() */
+ { .pid = FAKE_PID_BASH, .ip = FAKE_IP_KERNEL_PAGE_FAULT, },
+ },
+};
+
+static int add_hist_entries(struct perf_evlist *evlist, struct machine *machine)
+{
+ struct perf_evsel *evsel;
+ struct addr_location al;
+ struct hist_entry *he;
+ struct perf_sample sample = { .period = 1, .weight = 1, };
+ size_t i = 0, k;
+
+ /*
+ * each evsel will have 10 samples - 5 common and 5 distinct.
+ * However the second evsel also has a collapsed entry for
+ * "bash [libc] malloc" so total 9 entries will be in the tree.
+ */
+ evlist__for_each_entry(evlist, evsel) {
+ struct hists *hists = evsel__hists(evsel);
+
+ for (k = 0; k < ARRAY_SIZE(fake_common_samples); k++) {
+ sample.cpumode = PERF_RECORD_MISC_USER;
+ sample.pid = fake_common_samples[k].pid;
+ sample.tid = fake_common_samples[k].pid;
+ sample.ip = fake_common_samples[k].ip;
+
+ if (machine__resolve(machine, &al, &sample) < 0)
+ goto out;
+
+ he = hists__add_entry(hists, &al, NULL,
+ NULL, NULL, &sample, true);
+ if (he == NULL) {
+ addr_location__put(&al);
+ goto out;
+ }
+
+ fake_common_samples[k].thread = al.thread;
+ fake_common_samples[k].map = al.map;
+ fake_common_samples[k].sym = al.sym;
+ }
+
+ for (k = 0; k < ARRAY_SIZE(fake_samples[i]); k++) {
+ sample.pid = fake_samples[i][k].pid;
+ sample.tid = fake_samples[i][k].pid;
+ sample.ip = fake_samples[i][k].ip;
+ if (machine__resolve(machine, &al, &sample) < 0)
+ goto out;
+
+ he = hists__add_entry(hists, &al, NULL,
+ NULL, NULL, &sample, true);
+ if (he == NULL) {
+ addr_location__put(&al);
+ goto out;
+ }
+
+ fake_samples[i][k].thread = al.thread;
+ fake_samples[i][k].map = al.map;
+ fake_samples[i][k].sym = al.sym;
+ }
+ i++;
+ }
+
+ return 0;
+
+out:
+ pr_debug("Not enough memory for adding a hist entry\n");
+ return -1;
+}
+
+static int find_sample(struct sample *samples, size_t nr_samples,
+ struct thread *t, struct map *m, struct symbol *s)
+{
+ while (nr_samples--) {
+ if (samples->thread == t && samples->map == m &&
+ samples->sym == s)
+ return 1;
+ samples++;
+ }
+ return 0;
+}
+
+static int __validate_match(struct hists *hists)
+{
+ size_t count = 0;
+ struct rb_root *root;
+ struct rb_node *node;
+
+ /*
+ * Only entries from fake_common_samples should have a pair.
+ */
+ if (hists__has(hists, need_collapse))
+ root = &hists->entries_collapsed;
+ else
+ root = hists->entries_in;
+
+ node = rb_first(root);
+ while (node) {
+ struct hist_entry *he;
+
+ he = rb_entry(node, struct hist_entry, rb_node_in);
+
+ if (hist_entry__has_pairs(he)) {
+ if (find_sample(fake_common_samples,
+ ARRAY_SIZE(fake_common_samples),
+ he->thread, he->ms.map, he->ms.sym)) {
+ count++;
+ } else {
+ pr_debug("Can't find the matched entry\n");
+ return -1;
+ }
+ }
+
+ node = rb_next(node);
+ }
+
+ if (count != ARRAY_SIZE(fake_common_samples)) {
+ pr_debug("Invalid count for matched entries: %zd of %zd\n",
+ count, ARRAY_SIZE(fake_common_samples));
+ return -1;
+ }
+
+ return 0;
+}
+
+static int validate_match(struct hists *leader, struct hists *other)
+{
+ return __validate_match(leader) || __validate_match(other);
+}
+
+static int __validate_link(struct hists *hists, int idx)
+{
+ size_t count = 0;
+ size_t count_pair = 0;
+ size_t count_dummy = 0;
+ struct rb_root *root;
+ struct rb_node *node;
+
+ /*
+ * Leader hists (idx = 0) will have dummy entries from other,
+ * and some entries will have no pair. However every entry
+ * in other hists should have (dummy) pair.
+ */
+ if (hists__has(hists, need_collapse))
+ root = &hists->entries_collapsed;
+ else
+ root = hists->entries_in;
+
+ node = rb_first(root);
+ while (node) {
+ struct hist_entry *he;
+
+ he = rb_entry(node, struct hist_entry, rb_node_in);
+
+ if (hist_entry__has_pairs(he)) {
+ if (!find_sample(fake_common_samples,
+ ARRAY_SIZE(fake_common_samples),
+ he->thread, he->ms.map, he->ms.sym) &&
+ !find_sample(fake_samples[idx],
+ ARRAY_SIZE(fake_samples[idx]),
+ he->thread, he->ms.map, he->ms.sym)) {
+ count_dummy++;
+ }
+ count_pair++;
+ } else if (idx) {
+ pr_debug("A entry from the other hists should have pair\n");
+ return -1;
+ }
+
+ count++;
+ node = rb_next(node);
+ }
+
+ /*
+ * Note that we have a entry collapsed in the other (idx = 1) hists.
+ */
+ if (idx == 0) {
+ if (count_dummy != ARRAY_SIZE(fake_samples[1]) - 1) {
+ pr_debug("Invalid count of dummy entries: %zd of %zd\n",
+ count_dummy, ARRAY_SIZE(fake_samples[1]) - 1);
+ return -1;
+ }
+ if (count != count_pair + ARRAY_SIZE(fake_samples[0])) {
+ pr_debug("Invalid count of total leader entries: %zd of %zd\n",
+ count, count_pair + ARRAY_SIZE(fake_samples[0]));
+ return -1;
+ }
+ } else {
+ if (count != count_pair) {
+ pr_debug("Invalid count of total other entries: %zd of %zd\n",
+ count, count_pair);
+ return -1;
+ }
+ if (count_dummy > 0) {
+ pr_debug("Other hists should not have dummy entries: %zd\n",
+ count_dummy);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static int validate_link(struct hists *leader, struct hists *other)
+{
+ return __validate_link(leader, 0) || __validate_link(other, 1);
+}
+
+int test__hists_link(struct test *test __maybe_unused, int subtest __maybe_unused)
+{
+ int err = -1;
+ struct hists *hists, *first_hists;
+ struct machines machines;
+ struct machine *machine = NULL;
+ struct perf_evsel *evsel, *first;
+ struct perf_evlist *evlist = perf_evlist__new();
+
+ if (evlist == NULL)
+ return -ENOMEM;
+
+ err = parse_events(evlist, "cpu-clock", NULL);
+ if (err)
+ goto out;
+ err = parse_events(evlist, "task-clock", NULL);
+ if (err)
+ goto out;
+
+ err = TEST_FAIL;
+ /* default sort order (comm,dso,sym) will be used */
+ if (setup_sorting(NULL) < 0)
+ goto out;
+
+ machines__init(&machines);
+
+ /* setup threads/dso/map/symbols also */
+ machine = setup_fake_machine(&machines);
+ if (!machine)
+ goto out;
+
+ if (verbose > 1)
+ machine__fprintf(machine, stderr);
+
+ /* process sample events */
+ err = add_hist_entries(evlist, machine);
+ if (err < 0)
+ goto out;
+
+ evlist__for_each_entry(evlist, evsel) {
+ hists = evsel__hists(evsel);
+ hists__collapse_resort(hists, NULL);
+
+ if (verbose > 2)
+ print_hists_in(hists);
+ }
+
+ first = perf_evlist__first(evlist);
+ evsel = perf_evlist__last(evlist);
+
+ first_hists = evsel__hists(first);
+ hists = evsel__hists(evsel);
+
+ /* match common entries */
+ hists__match(first_hists, hists);
+ err = validate_match(first_hists, hists);
+ if (err)
+ goto out;
+
+ /* link common and/or dummy entries */
+ hists__link(first_hists, hists);
+ err = validate_link(first_hists, hists);
+ if (err)
+ goto out;
+
+ err = 0;
+
+out:
+ /* tear down everything */
+ perf_evlist__delete(evlist);
+ reset_output_field();
+ machines__exit(&machines);
+
+ return err;
+}
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