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-rw-r--r--tools/perf/builtin-lock.c147
1 files changed, 130 insertions, 17 deletions
diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 506c2fe42d52..054997edd98b 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -58,16 +58,28 @@ static struct rb_root thread_stats;
static bool combine_locks;
static bool show_thread_stats;
static bool show_lock_addrs;
+static bool show_lock_owner;
static bool use_bpf;
static unsigned long bpf_map_entries = 10240;
static int max_stack_depth = CONTENTION_STACK_DEPTH;
static int stack_skip = CONTENTION_STACK_SKIP;
static int print_nr_entries = INT_MAX / 2;
+static LIST_HEAD(callstack_filters);
+
+struct callstack_filter {
+ struct list_head list;
+ char name[];
+};
static struct lock_filter filters;
static enum lock_aggr_mode aggr_mode = LOCK_AGGR_ADDR;
+static bool needs_callstack(void)
+{
+ return verbose > 0 || !list_empty(&callstack_filters);
+}
+
static struct thread_stat *thread_stat_find(u32 tid)
{
struct rb_node *node;
@@ -454,7 +466,7 @@ static struct lock_stat *pop_from_result(void)
return container_of(node, struct lock_stat, rb);
}
-static struct lock_stat *lock_stat_find(u64 addr)
+struct lock_stat *lock_stat_find(u64 addr)
{
struct hlist_head *entry = lockhashentry(addr);
struct lock_stat *ret;
@@ -466,7 +478,7 @@ static struct lock_stat *lock_stat_find(u64 addr)
return NULL;
}
-static struct lock_stat *lock_stat_findnew(u64 addr, const char *name, int flags)
+struct lock_stat *lock_stat_findnew(u64 addr, const char *name, int flags)
{
struct hlist_head *entry = lockhashentry(addr);
struct lock_stat *ret, *new;
@@ -498,6 +510,34 @@ alloc_failed:
return NULL;
}
+bool match_callstack_filter(struct machine *machine, u64 *callstack)
+{
+ struct map *kmap;
+ struct symbol *sym;
+ u64 ip;
+
+ if (list_empty(&callstack_filters))
+ return true;
+
+ for (int i = 0; i < max_stack_depth; i++) {
+ struct callstack_filter *filter;
+
+ if (!callstack || !callstack[i])
+ break;
+
+ ip = callstack[i];
+ sym = machine__find_kernel_symbol(machine, ip, &kmap);
+ if (sym == NULL)
+ continue;
+
+ list_for_each_entry(filter, &callstack_filters, list) {
+ if (strstr(sym->name, filter->name))
+ return true;
+ }
+ }
+ return false;
+}
+
struct trace_lock_handler {
/* it's used on CONFIG_LOCKDEP */
int (*acquire_event)(struct evsel *evsel,
@@ -1059,12 +1099,6 @@ static int report_lock_contention_begin_event(struct evsel *evsel,
ls = lock_stat_findnew(key, name, flags);
if (!ls)
return -ENOMEM;
-
- if (aggr_mode == LOCK_AGGR_CALLER && verbose > 0) {
- ls->callstack = get_callstack(sample, max_stack_depth);
- if (ls->callstack == NULL)
- return -ENOMEM;
- }
}
if (filters.nr_types) {
@@ -1095,6 +1129,22 @@ static int report_lock_contention_begin_event(struct evsel *evsel,
return 0;
}
+ if (needs_callstack()) {
+ u64 *callstack = get_callstack(sample, max_stack_depth);
+ if (callstack == NULL)
+ return -ENOMEM;
+
+ if (!match_callstack_filter(machine, callstack)) {
+ free(callstack);
+ return 0;
+ }
+
+ if (ls->callstack == NULL)
+ ls->callstack = callstack;
+ else
+ free(callstack);
+ }
+
ts = thread_stat_findnew(sample->tid);
if (!ts)
return -ENOMEM;
@@ -1567,7 +1617,8 @@ static void print_contention_result(struct lock_contention *con)
switch (aggr_mode) {
case LOCK_AGGR_TASK:
- pr_info(" %10s %s\n\n", "pid", "comm");
+ pr_info(" %10s %s\n\n", "pid",
+ show_lock_owner ? "owner" : "comm");
break;
case LOCK_AGGR_CALLER:
pr_info(" %10s %s\n\n", "type", "caller");
@@ -1607,7 +1658,8 @@ static void print_contention_result(struct lock_contention *con)
case LOCK_AGGR_TASK:
pid = st->addr;
t = perf_session__findnew(session, pid);
- pr_info(" %10d %s\n", pid, thread__comm_str(t));
+ pr_info(" %10d %s\n",
+ pid, pid == -1 ? "Unknown" : thread__comm_str(t));
break;
case LOCK_AGGR_ADDR:
pr_info(" %016llx %s\n", (unsigned long long)st->addr,
@@ -1719,6 +1771,37 @@ static void sighandler(int sig __maybe_unused)
{
}
+static int check_lock_contention_options(const struct option *options,
+ const char * const *usage)
+
+{
+ if (show_thread_stats && show_lock_addrs) {
+ pr_err("Cannot use thread and addr mode together\n");
+ parse_options_usage(usage, options, "threads", 0);
+ parse_options_usage(NULL, options, "lock-addr", 0);
+ return -1;
+ }
+
+ if (show_lock_owner && !use_bpf) {
+ pr_err("Lock owners are available only with BPF\n");
+ parse_options_usage(usage, options, "lock-owner", 0);
+ parse_options_usage(NULL, options, "use-bpf", 0);
+ return -1;
+ }
+
+ if (show_lock_owner && show_lock_addrs) {
+ pr_err("Cannot use owner and addr mode together\n");
+ parse_options_usage(usage, options, "lock-owner", 0);
+ parse_options_usage(NULL, options, "lock-addr", 0);
+ return -1;
+ }
+
+ if (show_lock_owner)
+ show_thread_stats = true;
+
+ return 0;
+}
+
static int __cmd_contention(int argc, const char **argv)
{
int err = -EINVAL;
@@ -1743,6 +1826,8 @@ static int __cmd_contention(int argc, const char **argv)
.max_stack = max_stack_depth,
.stack_skip = stack_skip,
.filters = &filters,
+ .save_callstack = needs_callstack(),
+ .owner = show_lock_owner,
};
session = perf_session__new(use_bpf ? NULL : &data, &eops);
@@ -1756,6 +1841,9 @@ static int __cmd_contention(int argc, const char **argv)
con.aggr_mode = aggr_mode = show_thread_stats ? LOCK_AGGR_TASK :
show_lock_addrs ? LOCK_AGGR_ADDR : LOCK_AGGR_CALLER;
+ if (con.aggr_mode == LOCK_AGGR_CALLER)
+ con.save_callstack = true;
+
/* for lock function check */
symbol_conf.sort_by_name = true;
symbol_conf.allow_aliases = true;
@@ -2123,6 +2211,33 @@ static int parse_lock_addr(const struct option *opt __maybe_unused, const char *
return ret;
}
+static int parse_call_stack(const struct option *opt __maybe_unused, const char *str,
+ int unset __maybe_unused)
+{
+ char *s, *tmp, *tok;
+ int ret = 0;
+
+ s = strdup(str);
+ if (s == NULL)
+ return -1;
+
+ for (tok = strtok_r(s, ", ", &tmp); tok; tok = strtok_r(NULL, ", ", &tmp)) {
+ struct callstack_filter *entry;
+
+ entry = malloc(sizeof(*entry) + strlen(tok) + 1);
+ if (entry == NULL) {
+ pr_err("Memory allocation failure\n");
+ return -1;
+ }
+
+ strcpy(entry->name, tok);
+ list_add_tail(&entry->list, &callstack_filters);
+ }
+
+ free(s);
+ return ret;
+}
+
int cmd_lock(int argc, const char **argv)
{
const struct option lock_options[] = {
@@ -2190,6 +2305,9 @@ int cmd_lock(int argc, const char **argv)
"Filter specific type of locks", parse_lock_type),
OPT_CALLBACK('L', "lock-filter", NULL, "ADDRS/NAMES",
"Filter specific address/symbol of locks", parse_lock_addr),
+ OPT_CALLBACK('S', "callstack-filter", NULL, "NAMES",
+ "Filter specific function in the callstack", parse_call_stack),
+ OPT_BOOLEAN('o', "lock-owner", &show_lock_owner, "show lock owners instead of waiters"),
OPT_PARENT(lock_options)
};
@@ -2260,14 +2378,9 @@ int cmd_lock(int argc, const char **argv)
contention_usage, 0);
}
- if (show_thread_stats && show_lock_addrs) {
- pr_err("Cannot use thread and addr mode together\n");
- parse_options_usage(contention_usage, contention_options,
- "threads", 0);
- parse_options_usage(NULL, contention_options,
- "lock-addr", 0);
+ if (check_lock_contention_options(contention_options,
+ contention_usage) < 0)
return -1;
- }
rc = __cmd_contention(argc, argv);
} else {
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-18 16:26:45 +0300