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linux/tools/perf/util/metricgroup.c
Ian Rogers 97b6b4ac1c perf metrics: Fix segv for metrics with no events 
A metric may have no events, for example, the transaction metrics on
x86 are dependent on there being TSX events. Fix a segv where an evsel
of NULL is dereferenced for a metric leader value.

Fixes: a59fb796a3 ("perf metrics: Compute unmerged uncore metrics individually")
Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240224011420.3066322-2-irogers@google.com
2024-02-29 13:40:13 -08:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2017, Intel Corporation.
*/
/* Manage metrics and groups of metrics from JSON files */
#include "metricgroup.h"
#include "debug.h"
#include "evlist.h"
#include "evsel.h"
#include "strbuf.h"
#include "pmu.h"
#include "pmus.h"
#include "print-events.h"
#include "smt.h"
#include "expr.h"
#include "rblist.h"
#include <string.h>
#include <errno.h>
#include "strlist.h"
#include <assert.h>
#include <linux/ctype.h>
#include <linux/list_sort.h>
#include <linux/string.h>
#include <linux/zalloc.h>
#include <perf/cpumap.h>
#include <subcmd/parse-options.h>
#include <api/fs/fs.h>
#include "util.h"
#include <asm/bug.h>
#include "cgroup.h"
#include "util/hashmap.h"
struct metric_event *metricgroup__lookup(struct rblist *metric_events,
struct evsel *evsel,
bool create)
{
struct rb_node *nd;
struct metric_event me = {
.evsel = evsel
};
if (!metric_events)
return NULL;
if (evsel && evsel->metric_leader)
me.evsel = evsel->metric_leader;
nd = rblist__find(metric_events, &me);
if (nd)
return container_of(nd, struct metric_event, nd);
if (create) {
rblist__add_node(metric_events, &me);
nd = rblist__find(metric_events, &me);
if (nd)
return container_of(nd, struct metric_event, nd);
}
return NULL;
}
static int metric_event_cmp(struct rb_node *rb_node, const void *entry)
{
struct metric_event *a = container_of(rb_node,
struct metric_event,
nd);
const struct metric_event *b = entry;
if (a->evsel == b->evsel)
return 0;
if ((char *)a->evsel < (char *)b->evsel)
return -1;
return +1;
}
static struct rb_node *metric_event_new(struct rblist *rblist __maybe_unused,
const void *entry)
{
struct metric_event *me = malloc(sizeof(struct metric_event));
if (!me)
return NULL;
memcpy(me, entry, sizeof(struct metric_event));
me->evsel = ((struct metric_event *)entry)->evsel;
me->is_default = false;
INIT_LIST_HEAD(&me->head);
return &me->nd;
}
static void metric_event_delete(struct rblist *rblist __maybe_unused,
struct rb_node *rb_node)
{
struct metric_event *me = container_of(rb_node, struct metric_event, nd);
struct metric_expr *expr, *tmp;
list_for_each_entry_safe(expr, tmp, &me->head, nd) {
zfree(&expr->metric_name);
zfree(&expr->metric_refs);
zfree(&expr->metric_events);
free(expr);
}
free(me);
}
static void metricgroup__rblist_init(struct rblist *metric_events)
{
rblist__init(metric_events);
metric_events->node_cmp = metric_event_cmp;
metric_events->node_new = metric_event_new;
metric_events->node_delete = metric_event_delete;
}
void metricgroup__rblist_exit(struct rblist *metric_events)
{
rblist__exit(metric_events);
}
/**
* The metric under construction. The data held here will be placed in a
* metric_expr.
*/
struct metric {
struct list_head nd;
/**
* The expression parse context importantly holding the IDs contained
* within the expression.
*/
struct expr_parse_ctx *pctx;
const char *pmu;
/** The name of the metric such as "IPC". */
const char *metric_name;
/** Modifier on the metric such as "u" or NULL for none. */
const char *modifier;
/** The expression to parse, for example, "instructions/cycles". */
const char *metric_expr;
/** Optional threshold expression where zero value is green, otherwise red. */
const char *metric_threshold;
/**
* The "ScaleUnit" that scales and adds a unit to the metric during
* output.
*/
const char *metric_unit;
/**
* Optional name of the metric group reported
* if the Default metric group is being processed.
*/
const char *default_metricgroup_name;
/** Optional null terminated array of referenced metrics. */
struct metric_ref *metric_refs;
/**
* Should events of the metric be grouped?
*/
bool group_events;
/**
* Parsed events for the metric. Optional as events may be taken from a
* different metric whose group contains all the IDs necessary for this
* one.
*/
struct evlist *evlist;
};
static void metric__watchdog_constraint_hint(const char *name, bool foot)
{
static bool violate_nmi_constraint;
if (!foot) {
pr_warning("Not grouping metric %s's events.\n", name);
violate_nmi_constraint = true;
return;
}
if (!violate_nmi_constraint)
return;
pr_warning("Try disabling the NMI watchdog to comply NO_NMI_WATCHDOG metric constraint:\n"
" echo 0 > /proc/sys/kernel/nmi_watchdog\n"
" perf stat ...\n"
" echo 1 > /proc/sys/kernel/nmi_watchdog\n");
}
static bool metric__group_events(const struct pmu_metric *pm)
{
switch (pm->event_grouping) {
case MetricNoGroupEvents:
return false;
case MetricNoGroupEventsNmi:
if (!sysctl__nmi_watchdog_enabled())
return true;
metric__watchdog_constraint_hint(pm->metric_name, /*foot=*/false);
return false;
case MetricNoGroupEventsSmt:
return !smt_on();
case MetricGroupEvents:
default:
return true;
}
}
static void metric__free(struct metric *m)
{
if (!m)
return;
zfree(&m->metric_refs);
expr__ctx_free(m->pctx);
zfree(&m->modifier);
evlist__delete(m->evlist);
free(m);
}
static struct metric *metric__new(const struct pmu_metric *pm,
const char *modifier,
bool metric_no_group,
int runtime,
const char *user_requested_cpu_list,
bool system_wide)
{
struct metric *m;
m = zalloc(sizeof(*m));
if (!m)
return NULL;
m->pctx = expr__ctx_new();
if (!m->pctx)
goto out_err;
m->pmu = pm->pmu ?: "cpu";
m->metric_name = pm->metric_name;
m->default_metricgroup_name = pm->default_metricgroup_name ?: "";
m->modifier = NULL;
if (modifier) {
m->modifier = strdup(modifier);
if (!m->modifier)
goto out_err;
}
m->metric_expr = pm->metric_expr;
m->metric_threshold = pm->metric_threshold;
m->metric_unit = pm->unit;
m->pctx->sctx.user_requested_cpu_list = NULL;
if (user_requested_cpu_list) {
m->pctx->sctx.user_requested_cpu_list = strdup(user_requested_cpu_list);
if (!m->pctx->sctx.user_requested_cpu_list)
goto out_err;
}
m->pctx->sctx.runtime = runtime;
m->pctx->sctx.system_wide = system_wide;
m->group_events = !metric_no_group && metric__group_events(pm);
m->metric_refs = NULL;
m->evlist = NULL;
return m;
out_err:
metric__free(m);
return NULL;
}
static bool contains_metric_id(struct evsel **metric_events, int num_events,
const char *metric_id)
{
int i;
for (i = 0; i < num_events; i++) {
if (!strcmp(evsel__metric_id(metric_events[i]), metric_id))
return true;
}
return false;
}
/**
* setup_metric_events - Find a group of events in metric_evlist that correspond
* to the IDs from a parsed metric expression.
* @pmu: The PMU for the IDs.
* @ids: the metric IDs to match.
* @metric_evlist: the list of perf events.
* @out_metric_events: holds the created metric events array.
*/
static int setup_metric_events(const char *pmu, struct hashmap *ids,
struct evlist *metric_evlist,
struct evsel ***out_metric_events)
{
struct evsel **metric_events;
const char *metric_id;
struct evsel *ev;
size_t ids_size, matched_events, i;
bool all_pmus = !strcmp(pmu, "all") || perf_pmus__num_core_pmus() == 1 || !is_pmu_core(pmu);
*out_metric_events = NULL;
ids_size = hashmap__size(ids);
metric_events = calloc(ids_size + 1, sizeof(void *));
if (!metric_events)
return -ENOMEM;
matched_events = 0;
evlist__for_each_entry(metric_evlist, ev) {
struct expr_id_data *val_ptr;
/* Don't match events for the wrong hybrid PMU. */
if (!all_pmus && ev->pmu_name && evsel__is_hybrid(ev) &&
strcmp(ev->pmu_name, pmu))
continue;
/*
* Check for duplicate events with the same name. For
* example, uncore_imc/cas_count_read/ will turn into 6
* events per socket on skylakex. Only the first such
* event is placed in metric_events.
*/
metric_id = evsel__metric_id(ev);
if (contains_metric_id(metric_events, matched_events, metric_id))
continue;
/*
* Does this event belong to the parse context? For
* combined or shared groups, this metric may not care
* about this event.
*/
if (hashmap__find(ids, metric_id, &val_ptr)) {
pr_debug("Matched metric-id %s to %s\n", metric_id, evsel__name(ev));
metric_events[matched_events++] = ev;
if (matched_events >= ids_size)
break;
}
}
if (matched_events < ids_size) {
free(metric_events);
return -EINVAL;
}
for (i = 0; i < ids_size; i++) {
ev = metric_events[i];
ev->collect_stat = true;
/*
* The metric leader points to the identically named
* event in metric_events.
*/
ev->metric_leader = ev;
/*
* Mark two events with identical names in the same
* group (or globally) as being in use as uncore events
* may be duplicated for each pmu. Set the metric leader
* of such events to be the event that appears in
* metric_events.
*/
metric_id = evsel__metric_id(ev);
evlist__for_each_entry_continue(metric_evlist, ev) {
if (!strcmp(evsel__metric_id(ev), metric_id))
ev->metric_leader = metric_events[i];
}
}
*out_metric_events = metric_events;
return 0;
}
static bool match_metric(const char *metric_or_groups, const char *sought)
{
int len;
char *m;
if (!sought)
return false;
if (!strcmp(sought, "all"))
return true;
if (!metric_or_groups)
return !strcasecmp(sought, "No_group");
len = strlen(sought);
if (!strncasecmp(metric_or_groups, sought, len) &&
(metric_or_groups[len] == 0 || metric_or_groups[len] == ';'))
return true;
m = strchr(metric_or_groups, ';');
return m && match_metric(m + 1, sought);
}
static bool match_pm_metric(const struct pmu_metric *pm, const char *pmu, const char *metric)
{
const char *pm_pmu = pm->pmu ?: "cpu";
if (strcmp(pmu, "all") && strcmp(pm_pmu, pmu))
return false;
return match_metric(pm->metric_group, metric) ||
match_metric(pm->metric_name, metric);
}
/** struct mep - RB-tree node for building printing information. */
struct mep {
/** nd - RB-tree element. */
struct rb_node nd;
/** @metric_group: Owned metric group name, separated others with ';'. */
char *metric_group;
const char *metric_name;
const char *metric_desc;
const char *metric_long_desc;
const char *metric_expr;
const char *metric_threshold;
const char *metric_unit;
};
static int mep_cmp(struct rb_node *rb_node, const void *entry)
{
struct mep *a = container_of(rb_node, struct mep, nd);
struct mep *b = (struct mep *)entry;
int ret;
ret = strcmp(a->metric_group, b->metric_group);
if (ret)
return ret;
return strcmp(a->metric_name, b->metric_name);
}
static struct rb_node *mep_new(struct rblist *rl __maybe_unused, const void *entry)
{
struct mep *me = malloc(sizeof(struct mep));
if (!me)
return NULL;
memcpy(me, entry, sizeof(struct mep));
return &me->nd;
}
static void mep_delete(struct rblist *rl __maybe_unused,
struct rb_node *nd)
{
struct mep *me = container_of(nd, struct mep, nd);
zfree(&me->metric_group);
free(me);
}
static struct mep *mep_lookup(struct rblist *groups, const char *metric_group,
const char *metric_name)
{
struct rb_node *nd;
struct mep me = {
.metric_group = strdup(metric_group),
.metric_name = metric_name,
};
nd = rblist__find(groups, &me);
if (nd) {
free(me.metric_group);
return container_of(nd, struct mep, nd);
}
rblist__add_node(groups, &me);
nd = rblist__find(groups, &me);
if (nd)
return container_of(nd, struct mep, nd);
return NULL;
}
static int metricgroup__add_to_mep_groups(const struct pmu_metric *pm,
struct rblist *groups)
{
const char *g;
char *omg, *mg;
mg = strdup(pm->metric_group ?: "No_group");
if (!mg)
return -ENOMEM;
omg = mg;
while ((g = strsep(&mg, ";")) != NULL) {
struct mep *me;
g = skip_spaces(g);
if (strlen(g))
me = mep_lookup(groups, g, pm->metric_name);
else
me = mep_lookup(groups, "No_group", pm->metric_name);
if (me) {
me->metric_desc = pm->desc;
me->metric_long_desc = pm->long_desc;
me->metric_expr = pm->metric_expr;
me->metric_threshold = pm->metric_threshold;
me->metric_unit = pm->unit;
}
}
free(omg);
return 0;
}
struct metricgroup_iter_data {
pmu_metric_iter_fn fn;
void *data;
};
static int metricgroup__sys_event_iter(const struct pmu_metric *pm,
const struct pmu_metrics_table *table,
void *data)
{
struct metricgroup_iter_data *d = data;
struct perf_pmu *pmu = NULL;
if (!pm->metric_expr || !pm->compat)
return 0;
while ((pmu = perf_pmus__scan(pmu))) {
if (!pmu->id || !pmu_uncore_identifier_match(pm->compat, pmu->id))
continue;
return d->fn(pm, table, d->data);
}
return 0;
}
static int metricgroup__add_to_mep_groups_callback(const struct pmu_metric *pm,
const struct pmu_metrics_table *table __maybe_unused,
void *vdata)
{
struct rblist *groups = vdata;
return metricgroup__add_to_mep_groups(pm, groups);
}
void metricgroup__print(const struct print_callbacks *print_cb, void *print_state)
{
struct rblist groups;
const struct pmu_metrics_table *table;
struct rb_node *node, *next;
rblist__init(&groups);
groups.node_new = mep_new;
groups.node_cmp = mep_cmp;
groups.node_delete = mep_delete;
table = pmu_metrics_table__find();
if (table) {
pmu_metrics_table__for_each_metric(table,
metricgroup__add_to_mep_groups_callback,
&groups);
}
{
struct metricgroup_iter_data data = {
.fn = metricgroup__add_to_mep_groups_callback,
.data = &groups,
};
pmu_for_each_sys_metric(metricgroup__sys_event_iter, &data);
}
for (node = rb_first_cached(&groups.entries); node; node = next) {
struct mep *me = container_of(node, struct mep, nd);
print_cb->print_metric(print_state,
me->metric_group,
me->metric_name,
me->metric_desc,
me->metric_long_desc,
me->metric_expr,
me->metric_threshold,
me->metric_unit);
next = rb_next(node);
rblist__remove_node(&groups, node);
}
}
static const char *code_characters = ",-=@";
static int encode_metric_id(struct strbuf *sb, const char *x)
{
char *c;
int ret = 0;
for (; *x; x++) {
c = strchr(code_characters, *x);
if (c) {
ret = strbuf_addch(sb, '!');
if (ret)
break;
ret = strbuf_addch(sb, '0' + (c - code_characters));
if (ret)
break;
} else {
ret = strbuf_addch(sb, *x);
if (ret)
break;
}
}
return ret;
}
static int decode_metric_id(struct strbuf *sb, const char *x)
{
const char *orig = x;
size_t i;
char c;
int ret;
for (; *x; x++) {
c = *x;
if (*x == '!') {
x++;
i = *x - '0';
if (i > strlen(code_characters)) {
pr_err("Bad metric-id encoding in: '%s'", orig);
return -1;
}
c = code_characters[i];
}
ret = strbuf_addch(sb, c);
if (ret)
return ret;
}
return 0;
}
static int decode_all_metric_ids(struct evlist *perf_evlist, const char *modifier)
{
struct evsel *ev;
struct strbuf sb = STRBUF_INIT;
char *cur;
int ret = 0;
evlist__for_each_entry(perf_evlist, ev) {
if (!ev->metric_id)
continue;
ret = strbuf_setlen(&sb, 0);
if (ret)
break;
ret = decode_metric_id(&sb, ev->metric_id);
if (ret)
break;
free((char *)ev->metric_id);
ev->metric_id = strdup(sb.buf);
if (!ev->metric_id) {
ret = -ENOMEM;
break;
}
/*
* If the name is just the parsed event, use the metric-id to
* give a more friendly display version.
*/
if (strstr(ev->name, "metric-id=")) {
bool has_slash = false;
zfree(&ev->name);
for (cur = strchr(sb.buf, '@') ; cur; cur = strchr(++cur, '@')) {
*cur = '/';
has_slash = true;
}
if (modifier) {
if (!has_slash && !strchr(sb.buf, ':')) {
ret = strbuf_addch(&sb, ':');
if (ret)
break;
}
ret = strbuf_addstr(&sb, modifier);
if (ret)
break;
}
ev->name = strdup(sb.buf);
if (!ev->name) {
ret = -ENOMEM;
break;
}
}
}
strbuf_release(&sb);
return ret;
}
static int metricgroup__build_event_string(struct strbuf *events,
const struct expr_parse_ctx *ctx,
const char *modifier,
bool group_events)
{
struct hashmap_entry *cur;
size_t bkt;
bool no_group = true, has_tool_events = false;
bool tool_events[PERF_TOOL_MAX] = {false};
int ret = 0;
#define RETURN_IF_NON_ZERO(x) do { if (x) return x; } while (0)
hashmap__for_each_entry(ctx->ids, cur, bkt) {
const char *sep, *rsep, *id = cur->pkey;
enum perf_tool_event ev;
pr_debug("found event %s\n", id);
/* Always move tool events outside of the group. */
ev = perf_tool_event__from_str(id);
if (ev != PERF_TOOL_NONE) {
has_tool_events = true;
tool_events[ev] = true;
continue;
}
/* Separate events with commas and open the group if necessary. */
if (no_group) {
if (group_events) {
ret = strbuf_addch(events, '{');
RETURN_IF_NON_ZERO(ret);
}
no_group = false;
} else {
ret = strbuf_addch(events, ',');
RETURN_IF_NON_ZERO(ret);
}
/*
* Encode the ID as an event string. Add a qualifier for
* metric_id that is the original name except with characters
* that parse-events can't parse replaced. For example,
* 'msr@tsc@' gets added as msr/tsc,metric-id=msr!3tsc!3/
*/
sep = strchr(id, '@');
if (sep != NULL) {
ret = strbuf_add(events, id, sep - id);
RETURN_IF_NON_ZERO(ret);
ret = strbuf_addch(events, '/');
RETURN_IF_NON_ZERO(ret);
rsep = strrchr(sep, '@');
ret = strbuf_add(events, sep + 1, rsep - sep - 1);
RETURN_IF_NON_ZERO(ret);
ret = strbuf_addstr(events, ",metric-id=");
RETURN_IF_NON_ZERO(ret);
sep = rsep;
} else {
sep = strchr(id, ':');
if (sep != NULL) {
ret = strbuf_add(events, id, sep - id);
RETURN_IF_NON_ZERO(ret);
} else {
ret = strbuf_addstr(events, id);
RETURN_IF_NON_ZERO(ret);
}
ret = strbuf_addstr(events, "/metric-id=");
RETURN_IF_NON_ZERO(ret);
}
ret = encode_metric_id(events, id);
RETURN_IF_NON_ZERO(ret);
ret = strbuf_addstr(events, "/");
RETURN_IF_NON_ZERO(ret);
if (sep != NULL) {
ret = strbuf_addstr(events, sep + 1);
RETURN_IF_NON_ZERO(ret);
}
if (modifier) {
ret = strbuf_addstr(events, modifier);
RETURN_IF_NON_ZERO(ret);
}
}
if (!no_group && group_events) {
ret = strbuf_addf(events, "}:W");
RETURN_IF_NON_ZERO(ret);
}
if (has_tool_events) {
int i;
perf_tool_event__for_each_event(i) {
if (tool_events[i]) {
if (!no_group) {
ret = strbuf_addch(events, ',');
RETURN_IF_NON_ZERO(ret);
}
no_group = false;
ret = strbuf_addstr(events, perf_tool_event__to_str(i));
RETURN_IF_NON_ZERO(ret);
}
}
}
return ret;
#undef RETURN_IF_NON_ZERO
}
int __weak arch_get_runtimeparam(const struct pmu_metric *pm __maybe_unused)
{
return 1;
}
/*
* A singly linked list on the stack of the names of metrics being
* processed. Used to identify recursion.
*/
struct visited_metric {
const char *name;
const struct visited_metric *parent;
};
struct metricgroup_add_iter_data {
struct list_head *metric_list;
const char *pmu;
const char *metric_name;
const char *modifier;
int *ret;
bool *has_match;
bool metric_no_group;
bool metric_no_threshold;
const char *user_requested_cpu_list;
bool system_wide;
struct metric *root_metric;
const struct visited_metric *visited;
const struct pmu_metrics_table *table;
};
static bool metricgroup__find_metric(const char *pmu,
const char *metric,
const struct pmu_metrics_table *table,
struct pmu_metric *pm);
static int add_metric(struct list_head *metric_list,
const struct pmu_metric *pm,
const char *modifier,
bool metric_no_group,
bool metric_no_threshold,
const char *user_requested_cpu_list,
bool system_wide,
struct metric *root_metric,
const struct visited_metric *visited,
const struct pmu_metrics_table *table);
/**
* resolve_metric - Locate metrics within the root metric and recursively add
* references to them.
* @metric_list: The list the metric is added to.
* @pmu: The PMU name to resolve metrics on, or "all" for all PMUs.
* @modifier: if non-null event modifiers like "u".
* @metric_no_group: Should events written to events be grouped "{}" or
* global. Grouping is the default but due to multiplexing the
* user may override.
* @user_requested_cpu_list: Command line specified CPUs to record on.
* @system_wide: Are events for all processes recorded.
* @root_metric: Metrics may reference other metrics to form a tree. In this
* case the root_metric holds all the IDs and a list of referenced
* metrics. When adding a root this argument is NULL.
* @visited: A singly linked list of metric names being added that is used to
* detect recursion.
* @table: The table that is searched for metrics, most commonly the table for the
* architecture perf is running upon.
*/
static int resolve_metric(struct list_head *metric_list,
const char *pmu,
const char *modifier,
bool metric_no_group,
bool metric_no_threshold,
const char *user_requested_cpu_list,
bool system_wide,
struct metric *root_metric,
const struct visited_metric *visited,
const struct pmu_metrics_table *table)
{
struct hashmap_entry *cur;
size_t bkt;
struct to_resolve {
/* The metric to resolve. */
struct pmu_metric pm;
/*
* The key in the IDs map, this may differ from in case,
* etc. from pm->metric_name.
*/
const char *key;
} *pending = NULL;
int i, ret = 0, pending_cnt = 0;
/*
* Iterate all the parsed IDs and if there's a matching metric and it to
* the pending array.
*/
hashmap__for_each_entry(root_metric->pctx->ids, cur, bkt) {
struct pmu_metric pm;
if (metricgroup__find_metric(pmu, cur->pkey, table, &pm)) {
pending = realloc(pending,
(pending_cnt + 1) * sizeof(struct to_resolve));
if (!pending)
return -ENOMEM;
memcpy(&pending[pending_cnt].pm, &pm, sizeof(pm));
pending[pending_cnt].key = cur->pkey;
pending_cnt++;
}
}
/* Remove the metric IDs from the context. */
for (i = 0; i < pending_cnt; i++)
expr__del_id(root_metric->pctx, pending[i].key);
/*
* Recursively add all the metrics, IDs are added to the root metric's
* context.
*/
for (i = 0; i < pending_cnt; i++) {
ret = add_metric(metric_list, &pending[i].pm, modifier, metric_no_group,
metric_no_threshold, user_requested_cpu_list, system_wide,
root_metric, visited, table);
if (ret)
break;
}
free(pending);
return ret;
}
/**
* __add_metric - Add a metric to metric_list.
* @metric_list: The list the metric is added to.
* @pm: The pmu_metric containing the metric to be added.
* @modifier: if non-null event modifiers like "u".
* @metric_no_group: Should events written to events be grouped "{}" or
* global. Grouping is the default but due to multiplexing the
* user may override.
* @metric_no_threshold: Should threshold expressions be ignored?
* @runtime: A special argument for the parser only known at runtime.
* @user_requested_cpu_list: Command line specified CPUs to record on.
* @system_wide: Are events for all processes recorded.
* @root_metric: Metrics may reference other metrics to form a tree. In this
* case the root_metric holds all the IDs and a list of referenced
* metrics. When adding a root this argument is NULL.
* @visited: A singly linked list of metric names being added that is used to
* detect recursion.
* @table: The table that is searched for metrics, most commonly the table for the
* architecture perf is running upon.
*/
static int __add_metric(struct list_head *metric_list,
const struct pmu_metric *pm,
const char *modifier,
bool metric_no_group,
bool metric_no_threshold,
int runtime,
const char *user_requested_cpu_list,
bool system_wide,
struct metric *root_metric,
const struct visited_metric *visited,
const struct pmu_metrics_table *table)
{
const struct visited_metric *vm;
int ret;
bool is_root = !root_metric;
const char *expr;
struct visited_metric visited_node = {
.name = pm->metric_name,
.parent = visited,
};
for (vm = visited; vm; vm = vm->parent) {
if (!strcmp(pm->metric_name, vm->name)) {
pr_err("failed: recursion detected for %s\n", pm->metric_name);
return -1;
}
}
if (is_root) {
/*
* This metric is the root of a tree and may reference other
* metrics that are added recursively.
*/
root_metric = metric__new(pm, modifier, metric_no_group, runtime,
user_requested_cpu_list, system_wide);
if (!root_metric)
return -ENOMEM;
} else {
int cnt = 0;
/*
* This metric was referenced in a metric higher in the
* tree. Check if the same metric is already resolved in the
* metric_refs list.
*/
if (root_metric->metric_refs) {
for (; root_metric->metric_refs[cnt].metric_name; cnt++) {
if (!strcmp(pm->metric_name,
root_metric->metric_refs[cnt].metric_name))
return 0;
}
}
/* Create reference. Need space for the entry and the terminator. */
root_metric->metric_refs = realloc(root_metric->metric_refs,
(cnt + 2) * sizeof(struct metric_ref));
if (!root_metric->metric_refs)
return -ENOMEM;
/*
* Intentionally passing just const char pointers,
* from 'pe' object, so they never go away. We don't
* need to change them, so there's no need to create
* our own copy.
*/
root_metric->metric_refs[cnt].metric_name = pm->metric_name;
root_metric->metric_refs[cnt].metric_expr = pm->metric_expr;
/* Null terminate array. */
root_metric->metric_refs[cnt+1].metric_name = NULL;
root_metric->metric_refs[cnt+1].metric_expr = NULL;
}
/*
* For both the parent and referenced metrics, we parse
* all the metric's IDs and add it to the root context.
*/
ret = 0;
expr = pm->metric_expr;
if (is_root && pm->metric_threshold) {
/*
* Threshold expressions are built off the actual metric. Switch
* to use that in case of additional necessary events. Change
* the visited node name to avoid this being flagged as
* recursion. If the threshold events are disabled, just use the
* metric's name as a reference. This allows metric threshold
* computation if there are sufficient events.
*/
assert(strstr(pm->metric_threshold, pm->metric_name));
expr = metric_no_threshold ? pm->metric_name : pm->metric_threshold;
visited_node.name = "__threshold__";
}
if (expr__find_ids(expr, NULL, root_metric->pctx) < 0) {
/* Broken metric. */
ret = -EINVAL;
}
if (!ret) {
/* Resolve referenced metrics. */
const char *pmu = pm->pmu ?: "cpu";
ret = resolve_metric(metric_list, pmu, modifier, metric_no_group,
metric_no_threshold, user_requested_cpu_list,
system_wide, root_metric, &visited_node,
table);
}
if (ret) {
if (is_root)
metric__free(root_metric);
} else if (is_root)
list_add(&root_metric->nd, metric_list);
return ret;
}
struct metricgroup__find_metric_data {
const char *pmu;
const char *metric;
struct pmu_metric *pm;
};
static int metricgroup__find_metric_callback(const struct pmu_metric *pm,
const struct pmu_metrics_table *table __maybe_unused,
void *vdata)
{
struct metricgroup__find_metric_data *data = vdata;
const char *pm_pmu = pm->pmu ?: "cpu";
if (strcmp(data->pmu, "all") && strcmp(pm_pmu, data->pmu))
return 0;
if (!match_metric(pm->metric_name, data->metric))
return 0;
memcpy(data->pm, pm, sizeof(*pm));
return 1;
}
static bool metricgroup__find_metric(const char *pmu,
const char *metric,
const struct pmu_metrics_table *table,
struct pmu_metric *pm)
{
struct metricgroup__find_metric_data data = {
.pmu = pmu,
.metric = metric,
.pm = pm,
};
return pmu_metrics_table__for_each_metric(table, metricgroup__find_metric_callback, &data)
? true : false;
}
static int add_metric(struct list_head *metric_list,
const struct pmu_metric *pm,
const char *modifier,
bool metric_no_group,
bool metric_no_threshold,
const char *user_requested_cpu_list,
bool system_wide,
struct metric *root_metric,
const struct visited_metric *visited,
const struct pmu_metrics_table *table)
{
int ret = 0;
pr_debug("metric expr %s for %s\n", pm->metric_expr, pm->metric_name);
if (!strstr(pm->metric_expr, "?")) {
ret = __add_metric(metric_list, pm, modifier, metric_no_group,
metric_no_threshold, 0, user_requested_cpu_list,
system_wide, root_metric, visited, table);
} else {
int j, count;
count = arch_get_runtimeparam(pm);
/* This loop is added to create multiple
* events depend on count value and add
* those events to metric_list.
*/
for (j = 0; j < count && !ret; j++)
ret = __add_metric(metric_list, pm, modifier, metric_no_group,
metric_no_threshold, j, user_requested_cpu_list,
system_wide, root_metric, visited, table);
}
return ret;
}
static int metricgroup__add_metric_sys_event_iter(const struct pmu_metric *pm,
const struct pmu_metrics_table *table __maybe_unused,
void *data)
{
struct metricgroup_add_iter_data *d = data;
int ret;
if (!match_pm_metric(pm, d->pmu, d->metric_name))
return 0;
ret = add_metric(d->metric_list, pm, d->modifier, d->metric_no_group,
d->metric_no_threshold, d->user_requested_cpu_list,
d->system_wide, d->root_metric, d->visited, d->table);
if (ret)
goto out;
*(d->has_match) = true;
out:
*(d->ret) = ret;
return ret;
}
/**
* metric_list_cmp - list_sort comparator that sorts metrics with more events to
* the front. tool events are excluded from the count.
*/
static int metric_list_cmp(void *priv __maybe_unused, const struct list_head *l,
const struct list_head *r)
{
const struct metric *left = container_of(l, struct metric, nd);
const struct metric *right = container_of(r, struct metric, nd);
struct expr_id_data *data;
int i, left_count, right_count;
left_count = hashmap__size(left->pctx->ids);
perf_tool_event__for_each_event(i) {
if (!expr__get_id(left->pctx, perf_tool_event__to_str(i), &data))
left_count--;
}
right_count = hashmap__size(right->pctx->ids);
perf_tool_event__for_each_event(i) {
if (!expr__get_id(right->pctx, perf_tool_event__to_str(i), &data))
right_count--;
}
return right_count - left_count;
}
/**
* default_metricgroup_cmp - Implements complex key for the Default metricgroup
* that first sorts by default_metricgroup_name, then
* metric_name.
*/
static int default_metricgroup_cmp(void *priv __maybe_unused,
const struct list_head *l,
const struct list_head *r)
{
const struct metric *left = container_of(l, struct metric, nd);
const struct metric *right = container_of(r, struct metric, nd);
int diff = strcmp(right->default_metricgroup_name, left->default_metricgroup_name);
if (diff)
return diff;
return strcmp(right->metric_name, left->metric_name);
}
struct metricgroup__add_metric_data {
struct list_head *list;
const char *pmu;
const char *metric_name;
const char *modifier;
const char *user_requested_cpu_list;
bool metric_no_group;
bool metric_no_threshold;
bool system_wide;
bool has_match;
};
static int metricgroup__add_metric_callback(const struct pmu_metric *pm,
const struct pmu_metrics_table *table,
void *vdata)
{
struct metricgroup__add_metric_data *data = vdata;
int ret = 0;
if (pm->metric_expr && match_pm_metric(pm, data->pmu, data->metric_name)) {
bool metric_no_group = data->metric_no_group ||
match_metric(pm->metricgroup_no_group, data->metric_name);
data->has_match = true;
ret = add_metric(data->list, pm, data->modifier, metric_no_group,
data->metric_no_threshold, data->user_requested_cpu_list,
data->system_wide, /*root_metric=*/NULL,
/*visited_metrics=*/NULL, table);
}
return ret;
}
/**
* metricgroup__add_metric - Find and add a metric, or a metric group.
* @pmu: The PMU name to search for metrics on, or "all" for all PMUs.
* @metric_name: The name of the metric or metric group. For example, "IPC"
* could be the name of a metric and "TopDownL1" the name of a
* metric group.
* @modifier: if non-null event modifiers like "u".
* @metric_no_group: Should events written to events be grouped "{}" or
* global. Grouping is the default but due to multiplexing the
* user may override.
* @user_requested_cpu_list: Command line specified CPUs to record on.
* @system_wide: Are events for all processes recorded.
* @metric_list: The list that the metric or metric group are added to.
* @table: The table that is searched for metrics, most commonly the table for the
* architecture perf is running upon.
*/
static int metricgroup__add_metric(const char *pmu, const char *metric_name, const char *modifier,
bool metric_no_group, bool metric_no_threshold,
const char *user_requested_cpu_list,
bool system_wide,
struct list_head *metric_list,
const struct pmu_metrics_table *table)
{
LIST_HEAD(list);
int ret;
bool has_match = false;
{
struct metricgroup__add_metric_data data = {
.list = &list,
.pmu = pmu,
.metric_name = metric_name,
.modifier = modifier,
.metric_no_group = metric_no_group,
.metric_no_threshold = metric_no_threshold,
.user_requested_cpu_list = user_requested_cpu_list,
.system_wide = system_wide,
.has_match = false,
};
/*
* Iterate over all metrics seeing if metric matches either the
* name or group. When it does add the metric to the list.
*/
ret = pmu_metrics_table__for_each_metric(table, metricgroup__add_metric_callback,
&data);
if (ret)
goto out;
has_match = data.has_match;
}
{
struct metricgroup_iter_data data = {
.fn = metricgroup__add_metric_sys_event_iter,
.data = (void *) &(struct metricgroup_add_iter_data) {
.metric_list = &list,
.pmu = pmu,
.metric_name = metric_name,
.modifier = modifier,
.metric_no_group = metric_no_group,
.user_requested_cpu_list = user_requested_cpu_list,
.system_wide = system_wide,
.has_match = &has_match,
.ret = &ret,
.table = table,
},
};
pmu_for_each_sys_metric(metricgroup__sys_event_iter, &data);
}
/* End of pmu events. */
if (!has_match)
ret = -EINVAL;
out:
/*
* add to metric_list so that they can be released
* even if it's failed
*/
list_splice(&list, metric_list);
return ret;
}
/**
* metricgroup__add_metric_list - Find and add metrics, or metric groups,
* specified in a list.
* @pmu: A pmu to restrict the metrics to, or "all" for all PMUS.
* @list: the list of metrics or metric groups. For example, "IPC,CPI,TopDownL1"
* would match the IPC and CPI metrics, and TopDownL1 would match all
* the metrics in the TopDownL1 group.
* @metric_no_group: Should events written to events be grouped "{}" or
* global. Grouping is the default but due to multiplexing the
* user may override.
* @user_requested_cpu_list: Command line specified CPUs to record on.
* @system_wide: Are events for all processes recorded.
* @metric_list: The list that metrics are added to.
* @table: The table that is searched for metrics, most commonly the table for the
* architecture perf is running upon.
*/
static int metricgroup__add_metric_list(const char *pmu, const char *list,
bool metric_no_group,
bool metric_no_threshold,
const char *user_requested_cpu_list,
bool system_wide, struct list_head *metric_list,
const struct pmu_metrics_table *table)
{
char *list_itr, *list_copy, *metric_name, *modifier;
int ret, count = 0;
list_copy = strdup(list);
if (!list_copy)
return -ENOMEM;
list_itr = list_copy;
while ((metric_name = strsep(&list_itr, ",")) != NULL) {
modifier = strchr(metric_name, ':');
if (modifier)
*modifier++ = '\0';
ret = metricgroup__add_metric(pmu, metric_name, modifier,
metric_no_group, metric_no_threshold,
user_requested_cpu_list,
system_wide, metric_list, table);
if (ret == -EINVAL)
pr_err("Cannot find metric or group `%s'\n", metric_name);
if (ret)
break;
count++;
}
free(list_copy);
if (!ret) {
/*
* Warn about nmi_watchdog if any parsed metrics had the
* NO_NMI_WATCHDOG constraint.
*/
metric__watchdog_constraint_hint(NULL, /*foot=*/true);
/* No metrics. */
if (count == 0)
return -EINVAL;
}
return ret;
}
static void metricgroup__free_metrics(struct list_head *metric_list)
{
struct metric *m, *tmp;
list_for_each_entry_safe (m, tmp, metric_list, nd) {
list_del_init(&m->nd);
metric__free(m);
}
}
/**
* find_tool_events - Search for the pressence of tool events in metric_list.
* @metric_list: List to take metrics from.
* @tool_events: Array of false values, indices corresponding to tool events set
* to true if tool event is found.
*/
static void find_tool_events(const struct list_head *metric_list,
bool tool_events[PERF_TOOL_MAX])
{
struct metric *m;
list_for_each_entry(m, metric_list, nd) {
int i;
perf_tool_event__for_each_event(i) {
struct expr_id_data *data;
if (!tool_events[i] &&
!expr__get_id(m->pctx, perf_tool_event__to_str(i), &data))
tool_events[i] = true;
}
}
}
/**
* build_combined_expr_ctx - Make an expr_parse_ctx with all !group_events
* metric IDs, as the IDs are held in a set,
* duplicates will be removed.
* @metric_list: List to take metrics from.
* @combined: Out argument for result.
*/
static int build_combined_expr_ctx(const struct list_head *metric_list,
struct expr_parse_ctx **combined)
{
struct hashmap_entry *cur;
size_t bkt;
struct metric *m;
char *dup;
int ret;
*combined = expr__ctx_new();
if (!*combined)
return -ENOMEM;
list_for_each_entry(m, metric_list, nd) {
if (!m->group_events && !m->modifier) {
hashmap__for_each_entry(m->pctx->ids, cur, bkt) {
dup = strdup(cur->pkey);
if (!dup) {
ret = -ENOMEM;
goto err_out;
}
ret = expr__add_id(*combined, dup);
if (ret)
goto err_out;
}
}
}
return 0;
err_out:
expr__ctx_free(*combined);
*combined = NULL;
return ret;
}
/**
* parse_ids - Build the event string for the ids and parse them creating an
* evlist. The encoded metric_ids are decoded.
* @metric_no_merge: is metric sharing explicitly disabled.
* @fake_pmu: used when testing metrics not supported by the current CPU.
* @ids: the event identifiers parsed from a metric.
* @modifier: any modifiers added to the events.
* @group_events: should events be placed in a weak group.
* @tool_events: entries set true if the tool event of index could be present in
* the overall list of metrics.
* @out_evlist: the created list of events.
*/
static int parse_ids(bool metric_no_merge, struct perf_pmu *fake_pmu,
struct expr_parse_ctx *ids, const char *modifier,
bool group_events, const bool tool_events[PERF_TOOL_MAX],
struct evlist **out_evlist)
{
struct parse_events_error parse_error;
struct evlist *parsed_evlist;
struct strbuf events = STRBUF_INIT;
int ret;
*out_evlist = NULL;
if (!metric_no_merge || hashmap__size(ids->ids) == 0) {
bool added_event = false;
int i;
/*
* We may fail to share events between metrics because a tool
* event isn't present in one metric. For example, a ratio of
* cache misses doesn't need duration_time but the same events
* may be used for a misses per second. Events without sharing
* implies multiplexing, that is best avoided, so place
* all tool events in every group.
*
* Also, there may be no ids/events in the expression parsing
* context because of constant evaluation, e.g.:
* event1 if #smt_on else 0
* Add a tool event to avoid a parse error on an empty string.
*/
perf_tool_event__for_each_event(i) {
if (tool_events[i]) {
char *tmp = strdup(perf_tool_event__to_str(i));
if (!tmp)
return -ENOMEM;
ids__insert(ids->ids, tmp);
added_event = true;
}
}
if (!added_event && hashmap__size(ids->ids) == 0) {
char *tmp = strdup("duration_time");
if (!tmp)
return -ENOMEM;
ids__insert(ids->ids, tmp);
}
}
ret = metricgroup__build_event_string(&events, ids, modifier,
group_events);
if (ret)
return ret;
parsed_evlist = evlist__new();
if (!parsed_evlist) {
ret = -ENOMEM;
goto err_out;
}
pr_debug("Parsing metric events '%s'\n", events.buf);
parse_events_error__init(&parse_error);
ret = __parse_events(parsed_evlist, events.buf, /*pmu_filter=*/NULL,
&parse_error, fake_pmu, /*warn_if_reordered=*/false);
if (ret) {
parse_events_error__print(&parse_error, events.buf);
goto err_out;
}
ret = decode_all_metric_ids(parsed_evlist, modifier);
if (ret)
goto err_out;
*out_evlist = parsed_evlist;
parsed_evlist = NULL;
err_out:
parse_events_error__exit(&parse_error);
evlist__delete(parsed_evlist);
strbuf_release(&events);
return ret;
}
static int parse_groups(struct evlist *perf_evlist,
const char *pmu, const char *str,
bool metric_no_group,
bool metric_no_merge,
bool metric_no_threshold,
const char *user_requested_cpu_list,
bool system_wide,
struct perf_pmu *fake_pmu,
struct rblist *metric_events_list,
const struct pmu_metrics_table *table)
{
struct evlist *combined_evlist = NULL;
LIST_HEAD(metric_list);
struct metric *m;
bool tool_events[PERF_TOOL_MAX] = {false};
bool is_default = !strcmp(str, "Default");
int ret;
if (metric_events_list->nr_entries == 0)
metricgroup__rblist_init(metric_events_list);
ret = metricgroup__add_metric_list(pmu, str, metric_no_group, metric_no_threshold,
user_requested_cpu_list,
system_wide, &metric_list, table);
if (ret)
goto out;
/* Sort metrics from largest to smallest. */
list_sort(NULL, &metric_list, metric_list_cmp);
if (!metric_no_merge) {
struct expr_parse_ctx *combined = NULL;
find_tool_events(&metric_list, tool_events);
ret = build_combined_expr_ctx(&metric_list, &combined);
if (!ret && combined && hashmap__size(combined->ids)) {
ret = parse_ids(metric_no_merge, fake_pmu, combined,
/*modifier=*/NULL,
/*group_events=*/false,
tool_events,
&combined_evlist);
}
if (combined)
expr__ctx_free(combined);
if (ret)
goto out;
}
if (is_default)
list_sort(NULL, &metric_list, default_metricgroup_cmp);
list_for_each_entry(m, &metric_list, nd) {
struct metric_event *me;
struct evsel **metric_events;
struct evlist *metric_evlist = NULL;
struct metric *n;
struct metric_expr *expr;
if (combined_evlist && !m->group_events) {
metric_evlist = combined_evlist;
} else if (!metric_no_merge) {
/*
* See if the IDs for this metric are a subset of an
* earlier metric.
*/
list_for_each_entry(n, &metric_list, nd) {
if (m == n)
break;
if (n->evlist == NULL)
continue;
if ((!m->modifier && n->modifier) ||
(m->modifier && !n->modifier) ||
(m->modifier && n->modifier &&
strcmp(m->modifier, n->modifier)))
continue;
if ((!m->pmu && n->pmu) ||
(m->pmu && !n->pmu) ||
(m->pmu && n->pmu && strcmp(m->pmu, n->pmu)))
continue;
if (expr__subset_of_ids(n->pctx, m->pctx)) {
pr_debug("Events in '%s' fully contained within '%s'\n",
m->metric_name, n->metric_name);
metric_evlist = n->evlist;
break;
}
}
}
if (!metric_evlist) {
ret = parse_ids(metric_no_merge, fake_pmu, m->pctx, m->modifier,
m->group_events, tool_events, &m->evlist);
if (ret)
goto out;
metric_evlist = m->evlist;
}
ret = setup_metric_events(fake_pmu ? "all" : m->pmu, m->pctx->ids,
metric_evlist, &metric_events);
if (ret) {
pr_err("Cannot resolve IDs for %s: %s\n",
m->metric_name, m->metric_expr);
goto out;
}
me = metricgroup__lookup(metric_events_list, metric_events[0], true);
expr = malloc(sizeof(struct metric_expr));
if (!expr) {
ret = -ENOMEM;
free(metric_events);
goto out;
}
expr->metric_refs = m->metric_refs;
m->metric_refs = NULL;
expr->metric_expr = m->metric_expr;
if (m->modifier) {
char *tmp;
if (asprintf(&tmp, "%s:%s", m->metric_name, m->modifier) < 0)
expr->metric_name = NULL;
else
expr->metric_name = tmp;
} else
expr->metric_name = strdup(m->metric_name);
if (!expr->metric_name) {
ret = -ENOMEM;
free(metric_events);
goto out;
}
expr->metric_threshold = m->metric_threshold;
expr->metric_unit = m->metric_unit;
expr->metric_events = metric_events;
expr->runtime = m->pctx->sctx.runtime;
expr->default_metricgroup_name = m->default_metricgroup_name;
me->is_default = is_default;
list_add(&expr->nd, &me->head);
}
if (combined_evlist) {
evlist__splice_list_tail(perf_evlist, &combined_evlist->core.entries);
evlist__delete(combined_evlist);
}
list_for_each_entry(m, &metric_list, nd) {
if (m->evlist)
evlist__splice_list_tail(perf_evlist, &m->evlist->core.entries);
}
out:
metricgroup__free_metrics(&metric_list);
return ret;
}
int metricgroup__parse_groups(struct evlist *perf_evlist,
const char *pmu,
const char *str,
bool metric_no_group,
bool metric_no_merge,
bool metric_no_threshold,
const char *user_requested_cpu_list,
bool system_wide,
struct rblist *metric_events)
{
const struct pmu_metrics_table *table = pmu_metrics_table__find();
if (!table)
return -EINVAL;
return parse_groups(perf_evlist, pmu, str, metric_no_group, metric_no_merge,
metric_no_threshold, user_requested_cpu_list, system_wide,
/*fake_pmu=*/NULL, metric_events, table);
}
int metricgroup__parse_groups_test(struct evlist *evlist,
const struct pmu_metrics_table *table,
const char *str,
struct rblist *metric_events)
{
return parse_groups(evlist, "all", str,
/*metric_no_group=*/false,
/*metric_no_merge=*/false,
/*metric_no_threshold=*/false,
/*user_requested_cpu_list=*/NULL,
/*system_wide=*/false,
&perf_pmu__fake, metric_events, table);
}
struct metricgroup__has_metric_data {
const char *pmu;
const char *metric;
};
static int metricgroup__has_metric_callback(const struct pmu_metric *pm,
const struct pmu_metrics_table *table __maybe_unused,
void *vdata)
{
struct metricgroup__has_metric_data *data = vdata;
return match_pm_metric(pm, data->pmu, data->metric) ? 1 : 0;
}
bool metricgroup__has_metric(const char *pmu, const char *metric)
{
const struct pmu_metrics_table *table = pmu_metrics_table__find();
struct metricgroup__has_metric_data data = {
.pmu = pmu,
.metric = metric,
};
if (!table)
return false;
return pmu_metrics_table__for_each_metric(table, metricgroup__has_metric_callback, &data)
? true : false;
}
static int metricgroup__topdown_max_level_callback(const struct pmu_metric *pm,
const struct pmu_metrics_table *table __maybe_unused,
void *data)
{
unsigned int *max_level = data;
unsigned int level;
const char *p = strstr(pm->metric_group ?: "", "TopdownL");
if (!p || p[8] == '\0')
return 0;
level = p[8] - '0';
if (level > *max_level)
*max_level = level;
return 0;
}
unsigned int metricgroups__topdown_max_level(void)
{
unsigned int max_level = 0;
const struct pmu_metrics_table *table = pmu_metrics_table__find();
if (!table)
return false;
pmu_metrics_table__for_each_metric(table, metricgroup__topdown_max_level_callback,
&max_level);
return max_level;
}
int metricgroup__copy_metric_events(struct evlist *evlist, struct cgroup *cgrp,
struct rblist *new_metric_events,
struct rblist *old_metric_events)
{
unsigned int i;
for (i = 0; i < rblist__nr_entries(old_metric_events); i++) {
struct rb_node *nd;
struct metric_event *old_me, *new_me;
struct metric_expr *old_expr, *new_expr;
struct evsel *evsel;
size_t alloc_size;
int idx, nr;
nd = rblist__entry(old_metric_events, i);
old_me = container_of(nd, struct metric_event, nd);
evsel = evlist__find_evsel(evlist, old_me->evsel->core.idx);
if (!evsel)
return -EINVAL;
new_me = metricgroup__lookup(new_metric_events, evsel, true);
if (!new_me)
return -ENOMEM;
pr_debug("copying metric event for cgroup '%s': %s (idx=%d)\n",
cgrp ? cgrp->name : "root", evsel->name, evsel->core.idx);
list_for_each_entry(old_expr, &old_me->head, nd) {
new_expr = malloc(sizeof(*new_expr));
if (!new_expr)
return -ENOMEM;
new_expr->metric_expr = old_expr->metric_expr;
new_expr->metric_threshold = old_expr->metric_threshold;
new_expr->metric_name = strdup(old_expr->metric_name);
if (!new_expr->metric_name)
return -ENOMEM;
new_expr->metric_unit = old_expr->metric_unit;
new_expr->runtime = old_expr->runtime;
if (old_expr->metric_refs) {
/* calculate number of metric_events */
for (nr = 0; old_expr->metric_refs[nr].metric_name; nr++)
continue;
alloc_size = sizeof(*new_expr->metric_refs);
new_expr->metric_refs = calloc(nr + 1, alloc_size);
if (!new_expr->metric_refs) {
free(new_expr);
return -ENOMEM;
}
memcpy(new_expr->metric_refs, old_expr->metric_refs,
nr * alloc_size);
} else {
new_expr->metric_refs = NULL;
}
/* calculate number of metric_events */
for (nr = 0; old_expr->metric_events[nr]; nr++)
continue;
alloc_size = sizeof(*new_expr->metric_events);
new_expr->metric_events = calloc(nr + 1, alloc_size);
if (!new_expr->metric_events) {
zfree(&new_expr->metric_refs);
free(new_expr);
return -ENOMEM;
}
/* copy evsel in the same position */
for (idx = 0; idx < nr; idx++) {
evsel = old_expr->metric_events[idx];
evsel = evlist__find_evsel(evlist, evsel->core.idx);
if (evsel == NULL) {
zfree(&new_expr->metric_events);
zfree(&new_expr->metric_refs);
free(new_expr);
return -EINVAL;
}
new_expr->metric_events[idx] = evsel;
}
list_add(&new_expr->nd, &new_me->head);
}
}
return 0;
}
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