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Subject[RFC v2 06/17] perf kwork: Implement perf kwork report
Date
Implements framework of perf kwork report, which is used to report time
properties such as run time and frequency:

Test cases:

# perf kwork

Usage: perf kwork [<options>] {record|report}

-D, --dump-raw-trace dump raw trace in ASCII
-f, --force don't complain, do it
-k, --kwork <kwork> list of kwork to profile (irq, softirq, workqueue, etc)
-v, --verbose be more verbose (show symbol address, etc)

# perf kwork report -h

Usage: perf kwork report [<options>]

-C, --cpu <cpu> list of cpus to profile
-i, --input <file> input file name
-n, --name <name> event name to profile
-s, --sort <key[,key2...]>
sort by key(s): runtime, max, count
-S, --with-summary Show summary with statistics
--time <str> Time span for analysis (start,stop)

# perf kwork report

Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------

# perf kwork report -S

Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------
Total count : 0
Total runtime (msec) : 0.000 (0.000% load average)
Total time span (msec) : 0.000
--------------------------------------------------------------------------------------------------------------------------------

# perf kwork report -C 0,100
Requested CPU 100 too large. Consider raising MAX_NR_CPUS
Invalid cpu bitmap

# perf kwork report -s runtime1
Error: Unknown --sort key: `runtime1'

Usage: perf kwork report [<options>]

-C, --cpu <cpu> list of cpus to profile
-i, --input <file> input file name
-n, --name <name> event name to profile
-s, --sort <key[,key2...]>
sort by key(s): runtime, max, count
-S, --with-summary Show summary with statistics
--time <str> Time span for analysis (start,stop)

# perf kwork report -i perf_no_exist.data
failed to open perf_no_exist.data: No such file or directory

# perf kwork report --time 00FFF,
Invalid time span

Since there are no report supported events, the output is empty.

Briefly describe the data structure:
1. "class" indicates event type. For example, irq and softiq correspond
to different types.
2. "cluster" refers to a specific event corresponding to a type. For
example, RCU and TIMER in softirq correspond to different clusters,
which contains three types of events: raise, entry, and exit.
3. "atom" includes time of each sample and sample of the previous phase.
(For example, exit corresponds to entry, which is used for timehist.)

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
---
tools/perf/Documentation/perf-kwork.txt | 33 +
tools/perf/builtin-kwork.c | 859 +++++++++++++++++++++++-
tools/perf/util/kwork.h | 161 +++++
3 files changed, 1051 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-kwork.txt b/tools/perf/Documentation/perf-kwork.txt
index c5b52f61da99..b79b2c0d047e 100644
--- a/tools/perf/Documentation/perf-kwork.txt
+++ b/tools/perf/Documentation/perf-kwork.txt
@@ -17,8 +17,11 @@ There are several variants of 'perf kwork':
'perf kwork record <command>' to record the kernel work
of an arbitrary workload.

+ 'perf kwork report' to report the per kwork runtime.
+
Example usage:
perf kwork record -- sleep 1
+ perf kwork report

OPTIONS
-------
@@ -38,6 +41,36 @@ OPTIONS
--verbose::
Be more verbose. (show symbol address, etc)

+OPTIONS for 'perf kwork report'
+----------------------------
+
+-C::
+--cpu::
+ Only show events for the given CPU(s) (comma separated list).
+
+-i::
+--input::
+ Input file name. (default: perf.data unless stdin is a fifo)
+
+-n::
+--name::
+ Only show events for the given name.
+
+-s::
+--sort::
+ Sort by key(s): runtime, max, count
+
+-S::
+--with-summary::
+ Show summary with statistics
+
+--time::
+ Only analyze samples within given time window: <start>,<stop>. Times
+ have the format seconds.microseconds. If start is not given (i.e., time
+ string is ',x.y') then analysis starts at the beginning of the file. If
+ stop time is not given (i.e, time string is 'x.y,') then analysis goes
+ to end of file.
+
SEE ALSO
--------
linkperf:perf-record[1]
diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
index 8086236b7513..9c488d647995 100644
--- a/tools/perf/builtin-kwork.c
+++ b/tools/perf/builtin-kwork.c
@@ -25,6 +25,460 @@
#include <linux/time64.h>
#include <linux/zalloc.h>

+/*
+ * report header elements width
+ */
+#define PRINT_CPU_WIDTH 4
+#define PRINT_COUNT_WIDTH 9
+#define PRINT_RUNTIME_WIDTH 10
+#define PRINT_TIMESTAMP_WIDTH 17
+#define PRINT_KWORK_NAME_WIDTH 30
+#define RPINT_DECIMAL_WIDTH 3
+#define PRINT_TIME_UNIT_SEC_WIDTH 2
+#define PRINT_TIME_UNIT_MESC_WIDTH 3
+#define PRINT_RUNTIME_HEADER_WIDTH (PRINT_RUNTIME_WIDTH + PRINT_TIME_UNIT_MESC_WIDTH)
+#define PRINT_TIMESTAMP_HEADER_WIDTH (PRINT_TIMESTAMP_WIDTH + PRINT_TIME_UNIT_SEC_WIDTH)
+
+struct sort_dimension {
+ const char *name;
+ int (*cmp)(struct kwork_work *l, struct kwork_work *r);
+ struct list_head list;
+};
+
+static int id_cmp(struct kwork_work *l, struct kwork_work *r)
+{
+ if (l->cpu > r->cpu)
+ return 1;
+ if (l->cpu < r->cpu)
+ return -1;
+
+ if (l->id > r->id)
+ return 1;
+ if (l->id < r->id)
+ return -1;
+
+ return 0;
+}
+
+static int count_cmp(struct kwork_work *l, struct kwork_work *r)
+{
+ if (l->nr_atoms > r->nr_atoms)
+ return 1;
+ if (l->nr_atoms < r->nr_atoms)
+ return -1;
+
+ return 0;
+}
+
+static int runtime_cmp(struct kwork_work *l, struct kwork_work *r)
+{
+ if (l->total_runtime > r->total_runtime)
+ return 1;
+ if (l->total_runtime < r->total_runtime)
+ return -1;
+
+ return 0;
+}
+
+static int max_runtime_cmp(struct kwork_work *l, struct kwork_work *r)
+{
+ if (l->max_runtime > r->max_runtime)
+ return 1;
+ if (l->max_runtime < r->max_runtime)
+ return -1;
+
+ return 0;
+}
+
+static int sort_dimension__add(struct perf_kwork *kwork __maybe_unused,
+ const char *tok, struct list_head *list)
+{
+ size_t i;
+ static struct sort_dimension max_sort_dimension = {
+ .name = "max",
+ .cmp = max_runtime_cmp,
+ };
+ static struct sort_dimension id_sort_dimension = {
+ .name = "id",
+ .cmp = id_cmp,
+ };
+ static struct sort_dimension runtime_sort_dimension = {
+ .name = "runtime",
+ .cmp = runtime_cmp,
+ };
+ static struct sort_dimension count_sort_dimension = {
+ .name = "count",
+ .cmp = count_cmp,
+ };
+ struct sort_dimension *available_sorts[] = {
+ &id_sort_dimension,
+ &max_sort_dimension,
+ &count_sort_dimension,
+ &runtime_sort_dimension,
+ };
+
+ for (i = 0; i < ARRAY_SIZE(available_sorts); i++) {
+ if (!strcmp(available_sorts[i]->name, tok)) {
+ list_add_tail(&available_sorts[i]->list, list);
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+static void setup_sorting(struct perf_kwork *kwork,
+ const struct option *options,
+ const char * const usage_msg[])
+{
+ char *tmp, *tok, *str = strdup(kwork->sort_order);
+
+ for (tok = strtok_r(str, ", ", &tmp);
+ tok; tok = strtok_r(NULL, ", ", &tmp)) {
+ if (sort_dimension__add(kwork, tok, &kwork->sort_list) < 0)
+ usage_with_options_msg(usage_msg, options,
+ "Unknown --sort key: `%s'", tok);
+ }
+
+ pr_debug("Sort order: %s\n", kwork->sort_order);
+ free(str);
+}
+
+static struct kwork_atom *atom_new(struct perf_kwork *kwork,
+ struct perf_sample *sample)
+{
+ unsigned long i;
+ struct kwork_atom_page *page;
+ struct kwork_atom *atom = NULL;
+
+ list_for_each_entry(page, &kwork->atom_page_list, list) {
+ if (!bitmap_full(page->bitmap, NR_ATOM_PER_PAGE)) {
+ i = find_first_zero_bit(page->bitmap, NR_ATOM_PER_PAGE);
+ BUG_ON(i >= NR_ATOM_PER_PAGE);
+ atom = &page->atoms[i];
+ goto found_atom;
+ }
+ }
+
+ /*
+ * new page
+ */
+ page = zalloc(sizeof(*page));
+ if (page == NULL) {
+ pr_err("Failed to zalloc kwork atom page\n");
+ return NULL;
+ }
+
+ i = 0;
+ atom = &page->atoms[0];
+ list_add_tail(&page->list, &kwork->atom_page_list);
+
+found_atom:
+ set_bit(i, page->bitmap);
+ atom->time = sample->time;
+ atom->prev = NULL;
+ atom->page_addr = page;
+ atom->bit_inpage = i;
+ return atom;
+}
+
+static void atom_free(struct kwork_atom *atom)
+{
+ if (atom->prev != NULL)
+ atom_free(atom->prev);
+
+ clear_bit(atom->bit_inpage,
+ ((struct kwork_atom_page *)atom->page_addr)->bitmap);
+}
+
+static void atom_del(struct kwork_atom *atom)
+{
+ list_del(&atom->list);
+ atom_free(atom);
+}
+
+static int work_cmp(struct list_head *list,
+ struct kwork_work *l, struct kwork_work *r)
+{
+ int ret = 0;
+ struct sort_dimension *sort;
+
+ BUG_ON(list_empty(list));
+
+ list_for_each_entry(sort, list, list) {
+ ret = sort->cmp(l, r);
+ if (ret)
+ return ret;
+ }
+
+ return ret;
+}
+
+static struct kwork_work *work_search(struct rb_root_cached *root,
+ struct kwork_work *key,
+ struct list_head *sort_list)
+{
+ int cmp;
+ struct kwork_work *work;
+ struct rb_node *node = root->rb_root.rb_node;
+
+ while (node) {
+ work = container_of(node, struct kwork_work, node);
+ cmp = work_cmp(sort_list, key, work);
+ if (cmp > 0)
+ node = node->rb_left;
+ else if (cmp < 0)
+ node = node->rb_right;
+ else {
+ if (work->name == NULL)
+ work->name = key->name;
+ return work;
+ }
+ }
+ return NULL;
+}
+
+static void work_insert(struct rb_root_cached *root,
+ struct kwork_work *key, struct list_head *sort_list)
+{
+ int cmp;
+ bool leftmost = true;
+ struct kwork_work *cur;
+ struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL;
+
+ while (*new) {
+ cur = container_of(*new, struct kwork_work, node);
+ parent = *new;
+ cmp = work_cmp(sort_list, key, cur);
+
+ if (cmp > 0)
+ new = &((*new)->rb_left);
+ else {
+ new = &((*new)->rb_right);
+ leftmost = false;
+ }
+ }
+
+ rb_link_node(&key->node, parent, new);
+ rb_insert_color_cached(&key->node, root, leftmost);
+}
+
+static struct kwork_work *work_new(struct kwork_work *key)
+{
+ int i;
+ struct kwork_work *work = zalloc(sizeof(*work));
+
+ if (work == NULL) {
+ pr_err("Failed to zalloc kwork work\n");
+ return NULL;
+ }
+
+ for (i = 0; i < KWORK_TRACE_MAX; i++)
+ INIT_LIST_HEAD(&work->atom_list[i]);
+
+ work->id = key->id;
+ work->cpu = key->cpu;
+ work->name = key->name;
+ work->class = key->class;
+ return work;
+}
+
+static struct kwork_work *work_findnew(struct rb_root_cached *root,
+ struct kwork_work *key,
+ struct list_head *sort_list)
+{
+ struct kwork_work *work = NULL;
+
+ work = work_search(root, key, sort_list);
+ if (work != NULL)
+ return work;
+
+ work = work_new(key);
+ if (work == NULL)
+ return NULL;
+
+ work_insert(root, work, sort_list);
+ return work;
+}
+
+static void profile_update_timespan(struct perf_kwork *kwork,
+ struct perf_sample *sample)
+{
+ if (!kwork->summary)
+ return;
+
+ if ((kwork->timestart == 0) || (kwork->timestart > sample->time))
+ kwork->timestart = sample->time;
+
+ if (kwork->timeend < sample->time)
+ kwork->timeend = sample->time;
+}
+
+static bool profile_event_match(struct perf_kwork *kwork,
+ struct kwork_work *work,
+ struct perf_sample *sample)
+{
+ int cpu = work->cpu;
+ u64 time = sample->time;
+ struct perf_time_interval *ptime = &kwork->ptime;
+
+ if ((kwork->cpu_list != NULL) && !test_bit(cpu, kwork->cpu_bitmap))
+ return false;
+
+ if (((ptime->start != 0) && (ptime->start > time)) ||
+ ((ptime->end != 0) && (ptime->end < time)))
+ return false;
+
+ if ((kwork->profile_name != NULL) &&
+ (work->name != NULL) &&
+ (strcmp(work->name, kwork->profile_name) != 0))
+ return false;
+
+ profile_update_timespan(kwork, sample);
+ return true;
+}
+
+static int work_push_atom(struct perf_kwork *kwork,
+ struct kwork_class *class,
+ enum kwork_trace_type src_type,
+ enum kwork_trace_type dst_type,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine,
+ struct kwork_work **ret_work)
+{
+ struct kwork_atom *atom, *dst_atom;
+ struct kwork_work *work, key;
+
+ BUG_ON(class->work_init == NULL);
+ class->work_init(class, &key, evsel, sample, machine);
+
+ atom = atom_new(kwork, sample);
+ if (atom == NULL)
+ return -1;
+
+ work = work_findnew(&class->work_root, &key, &kwork->cmp_id);
+ if (work == NULL) {
+ free(atom);
+ return -1;
+ }
+
+ if (!profile_event_match(kwork, work, sample))
+ return 0;
+
+ if ((dst_type >= 0) && (dst_type < KWORK_TRACE_MAX)) {
+ dst_atom = list_last_entry_or_null(&work->atom_list[dst_type],
+ struct kwork_atom, list);
+ if (dst_atom != NULL) {
+ atom->prev = dst_atom;
+ list_del(&dst_atom->list);
+ }
+ }
+
+ if (ret_work != NULL)
+ *ret_work = work;
+
+ list_add_tail(&atom->list, &work->atom_list[src_type]);
+
+ return 0;
+}
+
+static struct kwork_atom *work_pop_atom(struct perf_kwork *kwork,
+ struct kwork_class *class,
+ enum kwork_trace_type src_type,
+ enum kwork_trace_type dst_type,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine,
+ struct kwork_work **ret_work)
+{
+ struct kwork_atom *atom, *src_atom;
+ struct kwork_work *work, key;
+
+ BUG_ON(class->work_init == NULL);
+ class->work_init(class, &key, evsel, sample, machine);
+
+ work = work_findnew(&class->work_root, &key, &kwork->cmp_id);
+ if (ret_work != NULL)
+ *ret_work = work;
+
+ if (work == NULL)
+ return NULL;
+
+ if (!profile_event_match(kwork, work, sample))
+ return NULL;
+
+ atom = list_last_entry_or_null(&work->atom_list[dst_type],
+ struct kwork_atom, list);
+ if (atom != NULL)
+ return atom;
+
+ src_atom = atom_new(kwork, sample);
+ if (src_atom != NULL)
+ list_add_tail(&src_atom->list, &work->atom_list[src_type]);
+ else {
+ if (ret_work != NULL)
+ *ret_work = NULL;
+ }
+
+ return NULL;
+}
+
+static void report_update_exit_event(struct kwork_work *work,
+ struct kwork_atom *atom,
+ struct perf_sample *sample)
+{
+ u64 delta;
+ u64 exit_time = sample->time;
+ u64 entry_time = atom->time;
+
+ if ((entry_time != 0) && (exit_time >= entry_time)) {
+ delta = exit_time - entry_time;
+ if ((delta > work->max_runtime) ||
+ (work->max_runtime == 0)) {
+ work->max_runtime = delta;
+ work->max_runtime_start = entry_time;
+ work->max_runtime_end = exit_time;
+ }
+ work->total_runtime += delta;
+ work->nr_atoms++;
+ }
+}
+
+static int report_entry_event(struct perf_kwork *kwork,
+ struct kwork_class *class,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ return work_push_atom(kwork, class, KWORK_TRACE_ENTRY,
+ KWORK_TRACE_MAX, evsel, sample,
+ machine, NULL);
+}
+
+static int report_exit_event(struct perf_kwork *kwork,
+ struct kwork_class *class,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct kwork_atom *atom = NULL;
+ struct kwork_work *work = NULL;
+
+ atom = work_pop_atom(kwork, class, KWORK_TRACE_EXIT,
+ KWORK_TRACE_ENTRY, evsel, sample,
+ machine, &work);
+ if (work == NULL)
+ return -1;
+
+ if (atom != NULL) {
+ report_update_exit_event(work, atom, sample);
+ atom_del(atom);
+ }
+
+ return 0;
+}
+
const struct evsel_str_handler irq_tp_handlers[] = {
{ "irq:irq_handler_entry", NULL, },
{ "irq:irq_handler_exit", NULL, },
@@ -69,6 +523,351 @@ static struct kwork_class *kwork_class_supported_list[KWORK_CLASS_MAX] = {
[KWORK_CLASS_WORKQUEUE] = &kwork_workqueue,
};

+static void print_separator(int len)
+{
+ printf(" %.*s\n", len, graph_dotted_line);
+}
+
+static void report_print_work(struct perf_kwork *kwork,
+ struct kwork_work *work)
+{
+ int ret = 0;
+ char kwork_name[PRINT_KWORK_NAME_WIDTH];
+ char max_runtime_start[32], max_runtime_end[32];
+
+ printf(" ");
+
+ /*
+ * kwork name
+ */
+ if (work->class && work->class->work_name) {
+ work->class->work_name(work, kwork_name,
+ PRINT_KWORK_NAME_WIDTH);
+ ret += printf(" %-*s |", PRINT_KWORK_NAME_WIDTH, kwork_name);
+ } else
+ ret += printf(" %-*s |", PRINT_KWORK_NAME_WIDTH, "");
+
+ /*
+ * cpu
+ */
+ ret += printf(" %0*d |", PRINT_CPU_WIDTH, work->cpu);
+
+ /*
+ * total runtime
+ */
+ if (kwork->report == KWORK_REPORT_RUNTIME)
+ ret += printf(" %*.*f ms |",
+ PRINT_RUNTIME_WIDTH, RPINT_DECIMAL_WIDTH,
+ (double)work->total_runtime / NSEC_PER_MSEC);
+
+ /*
+ * count
+ */
+ ret += printf(" %*" PRIu64 " |", PRINT_COUNT_WIDTH, work->nr_atoms);
+
+ /*
+ * max runtime, max runtime start, max runtime end
+ */
+ if (kwork->report == KWORK_REPORT_RUNTIME) {
+
+ timestamp__scnprintf_usec(work->max_runtime_start,
+ max_runtime_start,
+ sizeof(max_runtime_start));
+ timestamp__scnprintf_usec(work->max_runtime_end,
+ max_runtime_end,
+ sizeof(max_runtime_end));
+ ret += printf(" %*.*f ms | %*s s | %*s s |",
+ PRINT_RUNTIME_WIDTH, RPINT_DECIMAL_WIDTH,
+ (double)work->max_runtime / NSEC_PER_MSEC,
+ PRINT_TIMESTAMP_WIDTH, max_runtime_start,
+ PRINT_TIMESTAMP_WIDTH, max_runtime_end);
+ }
+
+ printf("\n");
+}
+
+static int report_print_header(struct perf_kwork *kwork)
+{
+ int ret;
+
+ printf("\n ");
+ ret = printf(" %-*s | %-*s |",
+ PRINT_KWORK_NAME_WIDTH, "Kwork Name",
+ PRINT_CPU_WIDTH, "Cpu");
+
+ if (kwork->report == KWORK_REPORT_RUNTIME)
+ ret += printf(" %-*s |",
+ PRINT_RUNTIME_HEADER_WIDTH, "Total Runtime");
+
+ ret += printf(" %-*s |", PRINT_COUNT_WIDTH, "Count");
+
+ if (kwork->report == KWORK_REPORT_RUNTIME)
+ ret += printf(" %-*s | %-*s | %-*s |",
+ PRINT_RUNTIME_HEADER_WIDTH, "Max runtime",
+ PRINT_TIMESTAMP_HEADER_WIDTH, "Max runtime start",
+ PRINT_TIMESTAMP_HEADER_WIDTH, "Max runtime end");
+
+ printf("\n");
+ print_separator(ret);
+ return ret;
+}
+
+static void print_summary(struct perf_kwork *kwork)
+{
+ u64 time = kwork->timeend - kwork->timestart;
+
+ printf(" Total count : %9" PRIu64 "\n", kwork->all_count);
+ printf(" Total runtime (msec) : %9.3f (%.3f%% load average)\n",
+ (double)kwork->all_runtime / NSEC_PER_MSEC,
+ time == 0 ? 0 : (double)kwork->all_runtime / time);
+ printf(" Total time span (msec) : %9.3f\n",
+ (double)time / NSEC_PER_MSEC);
+}
+
+static unsigned long long nr_list_entry(struct list_head *head)
+{
+ struct list_head *pos;
+ unsigned long long n = 0;
+
+ list_for_each(pos, head)
+ n++;
+
+ return n;
+}
+
+static void print_skipped_events(struct perf_kwork *kwork)
+{
+ int i;
+ const char *const kwork_event_str[] = {
+ [KWORK_TRACE_ENTRY] = "entry",
+ [KWORK_TRACE_EXIT] = "exit",
+ };
+
+ if ((kwork->nr_skipped_events[KWORK_TRACE_MAX] != 0) &&
+ (kwork->nr_events != 0)) {
+ printf(" INFO: %.3f%% skipped events (%" PRIu64 " including ",
+ (double)kwork->nr_skipped_events[KWORK_TRACE_MAX] /
+ (double)kwork->nr_events * 100.0,
+ kwork->nr_skipped_events[KWORK_TRACE_MAX]);
+
+ for (i = 0; i < KWORK_TRACE_MAX; i++)
+ printf("%" PRIu64 " %s%s",
+ kwork->nr_skipped_events[i],
+ kwork_event_str[i],
+ (i == KWORK_TRACE_MAX - 1) ? ")\n" : ", ");
+ }
+
+ if (verbose > 0)
+ printf(" INFO: use %lld atom pages\n",
+ nr_list_entry(&kwork->atom_page_list));
+}
+
+static void print_bad_events(struct perf_kwork *kwork)
+{
+ if ((kwork->nr_lost_events != 0) && (kwork->nr_events != 0))
+ printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
+ (double)kwork->nr_lost_events /
+ (double)kwork->nr_events * 100.0,
+ kwork->nr_lost_events, kwork->nr_events,
+ kwork->nr_lost_chunks);
+}
+
+static void work_sort(struct perf_kwork *kwork, struct kwork_class *class)
+{
+ struct rb_node *node;
+ struct kwork_work *data;
+ struct rb_root_cached *root = &class->work_root;
+
+ pr_debug("Sorting %s ...\n", class->name);
+ for (;;) {
+ node = rb_first_cached(root);
+ if (!node)
+ break;
+
+ rb_erase_cached(node, root);
+ data = rb_entry(node, struct kwork_work, node);
+ work_insert(&kwork->sorted_work_root,
+ data, &kwork->sort_list);
+ }
+}
+
+static void perf_kwork__sort(struct perf_kwork *kwork)
+{
+ struct kwork_class *class;
+
+ list_for_each_entry(class, &kwork->class_list, list)
+ work_sort(kwork, class);
+}
+
+static int perf_kwork__check_config(struct perf_kwork *kwork,
+ struct perf_session *session)
+{
+ int ret;
+ struct kwork_class *class;
+
+ static struct trace_kwork_handler report_ops = {
+ .entry_event = report_entry_event,
+ .exit_event = report_exit_event,
+ };
+
+ switch (kwork->report) {
+ case KWORK_REPORT_RUNTIME:
+ kwork->tp_handler = &report_ops;
+ break;
+ default:
+ pr_debug("Invalid report type %d\n", kwork->report);
+ return -1;
+ }
+
+ list_for_each_entry(class, &kwork->class_list, list)
+ if ((class->class_init != NULL) &&
+ (class->class_init(class, session) != 0))
+ return -1;
+
+ if (kwork->cpu_list != NULL) {
+ ret = perf_session__cpu_bitmap(session,
+ kwork->cpu_list,
+ kwork->cpu_bitmap);
+ if (ret < 0) {
+ pr_err("Invalid cpu bitmap\n");
+ return -1;
+ }
+ }
+
+ if (kwork->time_str != NULL) {
+ ret = perf_time__parse_str(&kwork->ptime, kwork->time_str);
+ if (ret != 0) {
+ pr_err("Invalid time span\n");
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static int perf_kwork__read_events(struct perf_kwork *kwork)
+{
+ int ret = -1;
+ struct perf_session *session = NULL;
+
+ struct perf_data data = {
+ .path = input_name,
+ .mode = PERF_DATA_MODE_READ,
+ .force = kwork->force,
+ };
+
+ session = perf_session__new(&data, &kwork->tool);
+ if (IS_ERR(session)) {
+ pr_debug("Error creating perf session\n");
+ return PTR_ERR(session);
+ }
+
+ symbol__init(&session->header.env);
+
+ if (perf_kwork__check_config(kwork, session) != 0)
+ goto out_delete;
+
+ if (session->tevent.pevent &&
+ tep_set_function_resolver(session->tevent.pevent,
+ machine__resolve_kernel_addr,
+ &session->machines.host) < 0) {
+ pr_err("Failed to set libtraceevent function resolver\n");
+ goto out_delete;
+ }
+
+ ret = perf_session__process_events(session);
+ if (ret) {
+ pr_debug("Failed to process events, error %d\n", ret);
+ goto out_delete;
+ }
+
+ kwork->nr_events = session->evlist->stats.nr_events[0];
+ kwork->nr_lost_events = session->evlist->stats.total_lost;
+ kwork->nr_lost_chunks = session->evlist->stats.nr_events[PERF_RECORD_LOST];
+
+out_delete:
+ perf_session__delete(session);
+ return ret;
+}
+
+static void process_skipped_events(struct perf_kwork *kwork,
+ struct kwork_work *work)
+{
+ int i;
+ unsigned long long count;
+
+ for (i = 0; i < KWORK_TRACE_MAX; i++) {
+ count = nr_list_entry(&work->atom_list[i]);
+ kwork->nr_skipped_events[i] += count;
+ kwork->nr_skipped_events[KWORK_TRACE_MAX] += count;
+ }
+}
+
+static int perf_kwork__report(struct perf_kwork *kwork)
+{
+ int ret;
+ struct rb_node *next;
+ struct kwork_work *work;
+
+ ret = perf_kwork__read_events(kwork);
+ if (ret != 0)
+ return -1;
+
+ perf_kwork__sort(kwork);
+
+ setup_pager();
+
+ ret = report_print_header(kwork);
+ next = rb_first_cached(&kwork->sorted_work_root);
+ while (next) {
+ work = rb_entry(next, struct kwork_work, node);
+ process_skipped_events(kwork, work);
+
+ if (work->nr_atoms != 0) {
+ report_print_work(kwork, work);
+ if (kwork->summary) {
+ kwork->all_runtime += work->total_runtime;
+ kwork->all_count += work->nr_atoms;
+ }
+ }
+ next = rb_next(next);
+ }
+ print_separator(ret);
+
+ if (kwork->summary) {
+ print_summary(kwork);
+ print_separator(ret);
+ }
+
+ print_bad_events(kwork);
+ print_skipped_events(kwork);
+ printf("\n");
+
+ return 0;
+}
+
+typedef int (*tracepoint_handler)(struct perf_tool *tool,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine);
+
+static int perf_kwork__process_tracepoint_sample(struct perf_tool *tool,
+ union perf_event *event __maybe_unused,
+ struct perf_sample *sample,
+ struct evsel *evsel,
+ struct machine *machine)
+{
+ int err = 0;
+
+ if (evsel->handler != NULL) {
+ tracepoint_handler f = evsel->handler;
+
+ err = f(tool, evsel, sample, machine);
+ }
+
+ return err;
+}
+
static void setup_event_list(struct perf_kwork *kwork,
const struct option *options,
const char * const usage_msg[])
@@ -161,11 +960,37 @@ static int perf_kwork__record(struct perf_kwork *kwork,
int cmd_kwork(int argc, const char **argv)
{
static struct perf_kwork kwork = {
+ .tool = {
+ .mmap = perf_event__process_mmap,
+ .mmap2 = perf_event__process_mmap2,
+ .sample = perf_kwork__process_tracepoint_sample,
+ },
+
.class_list = LIST_HEAD_INIT(kwork.class_list),
+ .atom_page_list = LIST_HEAD_INIT(kwork.atom_page_list),
+ .sort_list = LIST_HEAD_INIT(kwork.sort_list),
+ .cmp_id = LIST_HEAD_INIT(kwork.cmp_id),
+ .sorted_work_root = RB_ROOT_CACHED,
+ .tp_handler = NULL,

+ .profile_name = NULL,
+ .cpu_list = NULL,
+ .time_str = NULL,
.force = false,
.event_list_str = NULL,
+ .summary = false,
+ .sort_order = NULL,
+
+ .timestart = 0,
+ .timeend = 0,
+ .nr_events = 0,
+ .nr_lost_chunks = 0,
+ .nr_lost_events = 0,
+ .all_runtime = 0,
+ .all_count = 0,
+ .nr_skipped_events = { 0 },
};
+ static const char default_report_sort_order[] = "runtime, max, count";

const struct option kwork_options[] = {
OPT_INCR('v', "verbose", &verbose,
@@ -177,13 +1002,32 @@ int cmd_kwork(int argc, const char **argv)
OPT_BOOLEAN('f', "force", &kwork.force, "don't complain, do it"),
OPT_END()
};
+ const struct option report_options[] = {
+ OPT_STRING('s', "sort", &kwork.sort_order, "key[,key2...]",
+ "sort by key(s): runtime, max, count"),
+ OPT_STRING('C', "cpu", &kwork.cpu_list, "cpu",
+ "list of cpus to profile"),
+ OPT_STRING('n', "name", &kwork.profile_name, "name",
+ "event name to profile"),
+ OPT_STRING(0, "time", &kwork.time_str, "str",
+ "Time span for analysis (start,stop)"),
+ OPT_STRING('i', "input", &input_name, "file",
+ "input file name"),
+ OPT_BOOLEAN('S', "with-summary", &kwork.summary,
+ "Show summary with statistics"),
+ OPT_PARENT(kwork_options)
+ };

const char *kwork_usage[] = {
NULL,
NULL
};
+ const char * const report_usage[] = {
+ "perf kwork report [<options>]",
+ NULL
+ };
const char *const kwork_subcommands[] = {
- "record", NULL
+ "record", "report", NULL
};

argc = parse_options_subcommand(argc, argv, kwork_options,
@@ -193,10 +1037,21 @@ int cmd_kwork(int argc, const char **argv)
usage_with_options(kwork_usage, kwork_options);

setup_event_list(&kwork, kwork_options, kwork_usage);
+ sort_dimension__add(&kwork, "id", &kwork.cmp_id);

if (strlen(argv[0]) > 2 && strstarts("record", argv[0]))
return perf_kwork__record(&kwork, argc, argv);
- else
+ else if (strlen(argv[0]) > 2 && strstarts("report", argv[0])) {
+ kwork.sort_order = default_report_sort_order;
+ if (argc > 1) {
+ argc = parse_options(argc, argv, report_options, report_usage, 0);
+ if (argc)
+ usage_with_options(report_usage, report_options);
+ }
+ kwork.report = KWORK_REPORT_RUNTIME;
+ setup_sorting(&kwork, report_options, report_usage);
+ return perf_kwork__report(&kwork);
+ } else
usage_with_options(kwork_usage, kwork_options);

return 0;
diff --git a/tools/perf/util/kwork.h b/tools/perf/util/kwork.h
index 03203c4deb34..0a86bf47c74d 100644
--- a/tools/perf/util/kwork.h
+++ b/tools/perf/util/kwork.h
@@ -19,6 +19,105 @@ enum kwork_class_type {
KWORK_CLASS_MAX,
};

+enum kwork_report_type {
+ KWORK_REPORT_RUNTIME,
+};
+
+enum kwork_trace_type {
+ KWORK_TRACE_ENTRY,
+ KWORK_TRACE_EXIT,
+ KWORK_TRACE_MAX,
+};
+
+/*
+ * data structure:
+ *
+ * +==================+ +============+ +======================+
+ * | class | | work | | atom |
+ * +==================+ +============+ +======================+
+ * +------------+ | +-----+ | | +------+ | | +-------+ +-----+ |
+ * | perf_kwork | +-> | irq | --------|+-> | eth0 | --+-> | raise | - | ... | --+ +-----------+
+ * +-----+------+ || +-----+ ||| +------+ ||| +-------+ +-----+ | | | |
+ * | || ||| ||| | +-> | atom_page |
+ * | || ||| ||| +-------+ +-----+ | | |
+ * | class_list ||| |+-> | entry | - | ... | ----> | |
+ * | || ||| ||| +-------+ +-----+ | | |
+ * | || ||| ||| | +-> | |
+ * | || ||| ||| +-------+ +-----+ | | | |
+ * | || ||| |+-> | exit | - | ... | --+ +-----+-----+
+ * | || ||| | | +-------+ +-----+ | |
+ * | || ||| | | | |
+ * | || ||| +-----+ | | | |
+ * | || |+-> | ... | | | | |
+ * | || | | +-----+ | | | |
+ * | || | | | | | |
+ * | || +---------+ | | +-----+ | | +-------+ +-----+ | |
+ * | +-> | softirq | -------> | RCU | ---+-> | raise | - | ... | --+ +-----+-----+
+ * | || +---------+ | | +-----+ ||| +-------+ +-----+ | | | |
+ * | || | | ||| | +-> | atom_page |
+ * | || | | ||| +-------+ +-----+ | | |
+ * | || | | |+-> | entry | - | ... | ----> | |
+ * | || | | ||| +-------+ +-----+ | | |
+ * | || | | ||| | +-> | |
+ * | || | | ||| +-------+ +-----+ | | | |
+ * | || | | |+-> | exit | - | ... | --+ +-----+-----+
+ * | || | | | | +-------+ +-----+ | |
+ * | || | | | | | |
+ * | || +-----------+ | | +-----+ | | | |
+ * | +-> | workqueue | -----> | ... | | | | |
+ * | | +-----------+ | | +-----+ | | | |
+ * | +==================+ +============+ +======================+ |
+ * | |
+ * +----> atom_page_list ---------------------------------------------------------+
+ *
+ */
+
+struct kwork_atom {
+ struct list_head list;
+ u64 time;
+ struct kwork_atom *prev;
+
+ void *page_addr;
+ unsigned long bit_inpage;
+};
+
+#define NR_ATOM_PER_PAGE 128
+struct kwork_atom_page {
+ struct list_head list;
+ struct kwork_atom atoms[NR_ATOM_PER_PAGE];
+ DECLARE_BITMAP(bitmap, NR_ATOM_PER_PAGE);
+};
+
+struct kwork_class;
+struct kwork_work {
+ /*
+ * class field
+ */
+ struct rb_node node;
+ struct kwork_class *class;
+
+ /*
+ * work field
+ */
+ u64 id;
+ int cpu;
+ char *name;
+
+ /*
+ * atom field
+ */
+ u64 nr_atoms;
+ struct list_head atom_list[KWORK_TRACE_MAX];
+
+ /*
+ * runtime report
+ */
+ u64 max_runtime;
+ u64 max_runtime_start;
+ u64 max_runtime_end;
+ u64 total_runtime;
+};
+
struct kwork_class {
struct list_head list;
const char *name;
@@ -26,19 +125,81 @@ struct kwork_class {

unsigned int nr_tracepoints;
const struct evsel_str_handler *tp_handlers;
+
+ struct rb_root_cached work_root;
+
+ int (*class_init)(struct kwork_class *class,
+ struct perf_session *session);
+
+ void (*work_init)(struct kwork_class *class,
+ struct kwork_work *work,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine);
+
+ void (*work_name)(struct kwork_work *work,
+ char *buf, int len);
+};
+
+struct perf_kwork;
+struct trace_kwork_handler {
+ int (*entry_event)(struct perf_kwork *kwork,
+ struct kwork_class *class, struct evsel *evsel,
+ struct perf_sample *sample, struct machine *machine);
+
+ int (*exit_event)(struct perf_kwork *kwork,
+ struct kwork_class *class, struct evsel *evsel,
+ struct perf_sample *sample, struct machine *machine);
};

struct perf_kwork {
/*
* metadata
*/
+ struct perf_tool tool;
struct list_head class_list;
+ struct list_head atom_page_list;
+ struct list_head sort_list, cmp_id;
+ struct rb_root_cached sorted_work_root;
+ const struct trace_kwork_handler *tp_handler;
+
+ /*
+ * profile filters
+ */
+ const char *profile_name;
+
+ const char *cpu_list;
+ DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
+
+ const char *time_str;
+ struct perf_time_interval ptime;

/*
* options for command
*/
bool force;
const char *event_list_str;
+ enum kwork_report_type report;
+
+ /*
+ * options for subcommand
+ */
+ bool summary;
+ const char *sort_order;
+
+ /*
+ * statistics
+ */
+ u64 timestart;
+ u64 timeend;
+
+ unsigned long nr_events;
+ unsigned long nr_lost_chunks;
+ unsigned long nr_lost_events;
+
+ u64 all_runtime;
+ u64 all_count;
+ u64 nr_skipped_events[KWORK_TRACE_MAX + 1];
};

#endif /* PERF_UTIL_KWORK_H */
--
2.30.GIT
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