diff options
Diffstat (limited to 'tools/perf/builtin-lock.c')
| -rw-r--r-- | tools/perf/builtin-lock.c | 958 |
1 files changed, 846 insertions, 112 deletions
diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c index 23a33ac15e68..dd11d3471baf 100644 --- a/tools/perf/builtin-lock.c +++ b/tools/perf/builtin-lock.c @@ -9,16 +9,21 @@ #include "util/symbol.h" #include "util/thread.h" #include "util/header.h" +#include "util/target.h" +#include "util/callchain.h" +#include "util/lock-contention.h" #include <subcmd/pager.h> #include <subcmd/parse-options.h> #include "util/trace-event.h" +#include "util/tracepoint.h" #include "util/debug.h" #include "util/session.h" #include "util/tool.h" #include "util/data.h" #include "util/string2.h" +#include "util/map.h" #include <sys/types.h> #include <sys/prctl.h> @@ -32,8 +37,10 @@ #include <linux/kernel.h> #include <linux/zalloc.h> #include <linux/err.h> +#include <linux/stringify.h> static struct perf_session *session; +static struct target target; /* based on kernel/lockdep.c */ #define LOCKHASH_BITS 12 @@ -44,81 +51,23 @@ static struct hlist_head lockhash_table[LOCKHASH_SIZE]; #define __lockhashfn(key) hash_long((unsigned long)key, LOCKHASH_BITS) #define lockhashentry(key) (lockhash_table + __lockhashfn((key))) -struct lock_stat { - struct hlist_node hash_entry; - struct rb_node rb; /* used for sorting */ - - u64 addr; /* address of lockdep_map, used as ID */ - char *name; /* for strcpy(), we cannot use const */ - - unsigned int nr_acquire; - unsigned int nr_acquired; - unsigned int nr_contended; - unsigned int nr_release; - - unsigned int nr_readlock; - unsigned int nr_trylock; - - /* these times are in nano sec. */ - u64 avg_wait_time; - u64 wait_time_total; - u64 wait_time_min; - u64 wait_time_max; - - int broken; /* flag of blacklist */ - int combined; -}; - -/* - * States of lock_seq_stat - * - * UNINITIALIZED is required for detecting first event of acquire. - * As the nature of lock events, there is no guarantee - * that the first event for the locks are acquire, - * it can be acquired, contended or release. - */ -#define SEQ_STATE_UNINITIALIZED 0 /* initial state */ -#define SEQ_STATE_RELEASED 1 -#define SEQ_STATE_ACQUIRING 2 -#define SEQ_STATE_ACQUIRED 3 -#define SEQ_STATE_READ_ACQUIRED 4 -#define SEQ_STATE_CONTENDED 5 - -/* - * MAX_LOCK_DEPTH - * Imported from include/linux/sched.h. - * Should this be synchronized? - */ -#define MAX_LOCK_DEPTH 48 - -/* - * struct lock_seq_stat: - * Place to put on state of one lock sequence - * 1) acquire -> acquired -> release - * 2) acquire -> contended -> acquired -> release - * 3) acquire (with read or try) -> release - * 4) Are there other patterns? - */ -struct lock_seq_stat { - struct list_head list; - int state; - u64 prev_event_time; - u64 addr; - - int read_count; -}; - -struct thread_stat { - struct rb_node rb; - - u32 tid; - struct list_head seq_list; -}; - static struct rb_root thread_stats; static bool combine_locks; static bool show_thread_stats; +static bool use_bpf; +static unsigned long bpf_map_entries = 10240; + +static enum { + LOCK_AGGR_ADDR, + LOCK_AGGR_TASK, + LOCK_AGGR_CALLER, +} aggr_mode = LOCK_AGGR_ADDR; + +static u64 sched_text_start; +static u64 sched_text_end; +static u64 lock_text_start; +static u64 lock_text_end; static struct thread_stat *thread_stat_find(u32 tid) { @@ -251,6 +200,31 @@ struct lock_key { struct list_head list; }; +static void lock_stat_key_print_time(unsigned long long nsec, int len) +{ + static const struct { + float base; + const char *unit; + } table[] = { + { 1e9 * 3600, "h " }, + { 1e9 * 60, "m " }, + { 1e9, "s " }, + { 1e6, "ms" }, + { 1e3, "us" }, + { 0, NULL }, + }; + + for (int i = 0; table[i].unit; i++) { + if (nsec < table[i].base) + continue; + + pr_info("%*.2f %s", len - 3, nsec / table[i].base, table[i].unit); + return; + } + + pr_info("%*llu %s", len - 3, nsec, "ns"); +} + #define PRINT_KEY(member) \ static void lock_stat_key_print_ ## member(struct lock_key *key, \ struct lock_stat *ls) \ @@ -258,11 +232,18 @@ static void lock_stat_key_print_ ## member(struct lock_key *key, \ pr_info("%*llu", key->len, (unsigned long long)ls->member); \ } +#define PRINT_TIME(member) \ +static void lock_stat_key_print_ ## member(struct lock_key *key, \ + struct lock_stat *ls) \ +{ \ + lock_stat_key_print_time((unsigned long long)ls->member, key->len); \ +} + PRINT_KEY(nr_acquired) PRINT_KEY(nr_contended) -PRINT_KEY(avg_wait_time) -PRINT_KEY(wait_time_total) -PRINT_KEY(wait_time_max) +PRINT_TIME(avg_wait_time) +PRINT_TIME(wait_time_total) +PRINT_TIME(wait_time_max) static void lock_stat_key_print_wait_time_min(struct lock_key *key, struct lock_stat *ls) @@ -272,7 +253,7 @@ static void lock_stat_key_print_wait_time_min(struct lock_key *key, if (wait_time == ULLONG_MAX) wait_time = 0; - pr_info("%*"PRIu64, key->len, wait_time); + lock_stat_key_print_time(wait_time, key->len); } @@ -288,21 +269,36 @@ static const char *output_fields; #define DEF_KEY_LOCK(name, header, fn_suffix, len) \ { #name, header, len, lock_stat_key_ ## fn_suffix, lock_stat_key_print_ ## fn_suffix, {} } -struct lock_key keys[] = { +static struct lock_key report_keys[] = { DEF_KEY_LOCK(acquired, "acquired", nr_acquired, 10), DEF_KEY_LOCK(contended, "contended", nr_contended, 10), - DEF_KEY_LOCK(avg_wait, "avg wait (ns)", avg_wait_time, 15), - DEF_KEY_LOCK(wait_total, "total wait (ns)", wait_time_total, 15), - DEF_KEY_LOCK(wait_max, "max wait (ns)", wait_time_max, 15), - DEF_KEY_LOCK(wait_min, "min wait (ns)", wait_time_min, 15), + DEF_KEY_LOCK(avg_wait, "avg wait", avg_wait_time, 12), + DEF_KEY_LOCK(wait_total, "total wait", wait_time_total, 12), + DEF_KEY_LOCK(wait_max, "max wait", wait_time_max, 12), + DEF_KEY_LOCK(wait_min, "min wait", wait_time_min, 12), /* extra comparisons much complicated should be here */ { } }; -static int select_key(void) +static struct lock_key contention_keys[] = { + DEF_KEY_LOCK(contended, "contended", nr_contended, 10), + DEF_KEY_LOCK(wait_total, "total wait", wait_time_total, 12), + DEF_KEY_LOCK(wait_max, "max wait", wait_time_max, 12), + DEF_KEY_LOCK(wait_min, "min wait", wait_time_min, 12), + DEF_KEY_LOCK(avg_wait, "avg wait", avg_wait_time, 12), + + /* extra comparisons much complicated should be here */ + { } +}; + +static int select_key(bool contention) { int i; + struct lock_key *keys = report_keys; + + if (contention) + keys = contention_keys; for (i = 0; keys[i].name; i++) { if (!strcmp(keys[i].name, sort_key)) { @@ -320,9 +316,13 @@ static int select_key(void) return -1; } -static int add_output_field(struct list_head *head, char *name) +static int add_output_field(bool contention, char *name) { int i; + struct lock_key *keys = report_keys; + + if (contention) + keys = contention_keys; for (i = 0; keys[i].name; i++) { if (strcmp(keys[i].name, name)) @@ -330,7 +330,7 @@ static int add_output_field(struct list_head *head, char *name) /* prevent double link */ if (list_empty(&keys[i].list)) - list_add_tail(&keys[i].list, head); + list_add_tail(&keys[i].list, &lock_keys); return 0; } @@ -339,10 +339,14 @@ static int add_output_field(struct list_head *head, char *name) return -1; } -static int setup_output_field(const char *str) +static int setup_output_field(bool contention, const char *str) { char *tok, *tmp, *orig; int i, ret = 0; + struct lock_key *keys = report_keys; + + if (contention) + keys = contention_keys; /* no output field given: use all of them */ if (str == NULL) { @@ -359,7 +363,7 @@ static int setup_output_field(const char *str) return -ENOMEM; while ((tok = strsep(&tmp, ",")) != NULL){ - ret = add_output_field(&lock_keys, tok); + ret = add_output_field(contention, tok); if (ret < 0) break; } @@ -451,7 +455,19 @@ static struct lock_stat *pop_from_result(void) return container_of(node, struct lock_stat, rb); } -static struct lock_stat *lock_stat_findnew(u64 addr, const char *name) +static struct lock_stat *lock_stat_find(u64 addr) +{ + struct hlist_head *entry = lockhashentry(addr); + struct lock_stat *ret; + + hlist_for_each_entry(ret, entry, hash_entry) { + if (ret->addr == addr) + return ret; + } + return NULL; +} + +static struct lock_stat *lock_stat_findnew(u64 addr, const char *name, int flags) { struct hlist_head *entry = lockhashentry(addr); struct lock_stat *ret, *new; @@ -466,13 +482,13 @@ static struct lock_stat *lock_stat_findnew(u64 addr, const char *name) goto alloc_failed; new->addr = addr; - new->name = zalloc(sizeof(char) * strlen(name) + 1); + new->name = strdup(name); if (!new->name) { free(new); goto alloc_failed; } - strcpy(new->name, name); + new->flags = flags; new->wait_time_min = ULLONG_MAX; hlist_add_head(&new->hash_entry, entry); @@ -484,17 +500,29 @@ alloc_failed: } struct trace_lock_handler { + /* it's used on CONFIG_LOCKDEP */ int (*acquire_event)(struct evsel *evsel, struct perf_sample *sample); + /* it's used on CONFIG_LOCKDEP && CONFIG_LOCK_STAT */ int (*acquired_event)(struct evsel *evsel, struct perf_sample *sample); + /* it's used on CONFIG_LOCKDEP && CONFIG_LOCK_STAT */ int (*contended_event)(struct evsel *evsel, struct perf_sample *sample); + /* it's used on CONFIG_LOCKDEP */ int (*release_event)(struct evsel *evsel, struct perf_sample *sample); + + /* it's used when CONFIG_LOCKDEP is off */ + int (*contention_begin_event)(struct evsel *evsel, + struct perf_sample *sample); + + /* it's used when CONFIG_LOCKDEP is off */ + int (*contention_end_event)(struct evsel *evsel, + struct perf_sample *sample); }; static struct lock_seq_stat *get_seq(struct thread_stat *ts, u64 addr) @@ -542,12 +570,22 @@ static int report_lock_acquire_event(struct evsel *evsel, const char *name = evsel__strval(evsel, sample, "name"); u64 addr = evsel__intval(evsel, sample, "lockdep_addr"); int flag = evsel__intval(evsel, sample, "flags"); + u64 key; - /* abuse ls->addr for tid */ - if (show_thread_stats) - addr = sample->tid; + switch (aggr_mode) { + case LOCK_AGGR_ADDR: + key = addr; + break; + case LOCK_AGGR_TASK: + key = sample->tid; + break; + case LOCK_AGGR_CALLER: + default: + pr_err("Invalid aggregation mode: %d\n", aggr_mode); + return -EINVAL; + } - ls = lock_stat_findnew(addr, name); + ls = lock_stat_findnew(key, name, 0); if (!ls) return -ENOMEM; @@ -615,11 +653,22 @@ static int report_lock_acquired_event(struct evsel *evsel, u64 contended_term; const char *name = evsel__strval(evsel, sample, "name"); u64 addr = evsel__intval(evsel, sample, "lockdep_addr"); + u64 key; - if (show_thread_stats) - addr = sample->tid; + switch (aggr_mode) { + case LOCK_AGGR_ADDR: + key = addr; + break; + case LOCK_AGGR_TASK: + key = sample->tid; + break; + case LOCK_AGGR_CALLER: + default: + pr_err("Invalid aggregation mode: %d\n", aggr_mode); + return -EINVAL; + } - ls = lock_stat_findnew(addr, name); + ls = lock_stat_findnew(key, name, 0); if (!ls) return -ENOMEM; @@ -677,11 +726,22 @@ static int report_lock_contended_event(struct evsel *evsel, struct lock_seq_stat *seq; const char *name = evsel__strval(evsel, sample, "name"); u64 addr = evsel__intval(evsel, sample, "lockdep_addr"); + u64 key; - if (show_thread_stats) - addr = sample->tid; + switch (aggr_mode) { + case LOCK_AGGR_ADDR: + key = addr; + break; + case LOCK_AGGR_TASK: + key = sample->tid; + break; + case LOCK_AGGR_CALLER: + default: + pr_err("Invalid aggregation mode: %d\n", aggr_mode); + return -EINVAL; + } - ls = lock_stat_findnew(addr, name); + ls = lock_stat_findnew(key, name, 0); if (!ls) return -ENOMEM; @@ -732,11 +792,22 @@ static int report_lock_release_event(struct evsel *evsel, struct lock_seq_stat *seq; const char *name = evsel__strval(evsel, sample, "name"); u64 addr = evsel__intval(evsel, sample, "lockdep_addr"); + u64 key; - if (show_thread_stats) - addr = sample->tid; + switch (aggr_mode) { + case LOCK_AGGR_ADDR: + key = addr; + break; + case LOCK_AGGR_TASK: + key = sample->tid; + break; + case LOCK_AGGR_CALLER: + default: + pr_err("Invalid aggregation mode: %d\n", aggr_mode); + return -EINVAL; + } - ls = lock_stat_findnew(addr, name); + ls = lock_stat_findnew(key, name, 0); if (!ls) return -ENOMEM; @@ -783,6 +854,314 @@ end: return 0; } +bool is_lock_function(struct machine *machine, u64 addr) +{ + if (!sched_text_start) { + struct map *kmap; + struct symbol *sym; + + sym = machine__find_kernel_symbol_by_name(machine, + "__sched_text_start", + &kmap); + if (!sym) { + /* to avoid retry */ + sched_text_start = 1; + return false; + } + + sched_text_start = kmap->unmap_ip(kmap, sym->start); + + /* should not fail from here */ + sym = machine__find_kernel_symbol_by_name(machine, + "__sched_text_end", + &kmap); + sched_text_end = kmap->unmap_ip(kmap, sym->start); + + sym = machine__find_kernel_symbol_by_name(machine, + "__lock_text_start", + &kmap); + lock_text_start = kmap->unmap_ip(kmap, sym->start); + + sym = machine__find_kernel_symbol_by_name(machine, + "__lock_text_end", + &kmap); + lock_text_end = kmap->unmap_ip(kmap, sym->start); + } + + /* failed to get kernel symbols */ + if (sched_text_start == 1) + return false; + + /* mutex and rwsem functions are in sched text section */ + if (sched_text_start <= addr && addr < sched_text_end) + return true; + + /* spinlock functions are in lock text section */ + if (lock_text_start <= addr && addr < lock_text_end) + return true; + + return false; +} + +static int lock_contention_caller(struct evsel *evsel, struct perf_sample *sample, + char *buf, int size) +{ + struct thread *thread; + struct callchain_cursor *cursor = &callchain_cursor; + struct machine *machine = &session->machines.host; + struct symbol *sym; + int skip = 0; + int ret; + + /* lock names will be replaced to task name later */ + if (show_thread_stats) + return -1; + + thread = machine__findnew_thread(machine, -1, sample->pid); + if (thread == NULL) + return -1; + + /* use caller function name from the callchain */ + ret = thread__resolve_callchain(thread, cursor, evsel, sample, + NULL, NULL, CONTENTION_STACK_DEPTH); + if (ret != 0) { + thread__put(thread); + return -1; + } + + callchain_cursor_commit(cursor); + thread__put(thread); + + while (true) { + struct callchain_cursor_node *node; + + node = callchain_cursor_current(cursor); + if (node == NULL) + break; + + /* skip first few entries - for lock functions */ + if (++skip <= CONTENTION_STACK_SKIP) + goto next; + + sym = node->ms.sym; + if (sym && !is_lock_function(machine, node->ip)) { + struct map *map = node->ms.map; + u64 offset; + + offset = map->map_ip(map, node->ip) - sym->start; + + if (offset) + scnprintf(buf, size, "%s+%#lx", sym->name, offset); + else + strlcpy(buf, sym->name, size); + return 0; + } + +next: + callchain_cursor_advance(cursor); + } + return -1; +} + +static u64 callchain_id(struct evsel *evsel, struct perf_sample *sample) +{ + struct callchain_cursor *cursor = &callchain_cursor; + struct machine *machine = &session->machines.host; + struct thread *thread; + u64 hash = 0; + int skip = 0; + int ret; + + thread = machine__findnew_thread(machine, -1, sample->pid); + if (thread == NULL) + return -1; + + /* use caller function name from the callchain */ + ret = thread__resolve_callchain(thread, cursor, evsel, sample, + NULL, NULL, CONTENTION_STACK_DEPTH); + thread__put(thread); + + if (ret != 0) + return -1; + + callchain_cursor_commit(cursor); + + while (true) { + struct callchain_cursor_node *node; + + node = callchain_cursor_current(cursor); + if (node == NULL) + break; + + /* skip first few entries - for lock functions */ + if (++skip <= CONTENTION_STACK_SKIP) + goto next; + + if (node->ms.sym && is_lock_function(machine, node->ip)) + goto next; + + hash ^= hash_long((unsigned long)node->ip, 64); + +next: + callchain_cursor_advance(cursor); + } + return hash; +} + +static int report_lock_contention_begin_event(struct evsel *evsel, + struct perf_sample *sample) +{ + struct lock_stat *ls; + struct thread_stat *ts; + struct lock_seq_stat *seq; + u64 addr = evsel__intval(evsel, sample, "lock_addr"); + u64 key; + + switch (aggr_mode) { + case LOCK_AGGR_ADDR: + key = addr; + break; + case LOCK_AGGR_TASK: + key = sample->tid; + break; + case LOCK_AGGR_CALLER: + key = callchain_id(evsel, sample); + break; + default: + pr_err("Invalid aggregation mode: %d\n", aggr_mode); + return -EINVAL; + } + + ls = lock_stat_find(key); + if (!ls) { + char buf[128]; + const char *caller = buf; + unsigned int flags = evsel__intval(evsel, sample, "flags"); + + if (lock_contention_caller(evsel, sample, buf, sizeof(buf)) < 0) + caller = "Unknown"; + + ls = lock_stat_findnew(key, caller, flags); + if (!ls) + return -ENOMEM; + } + + ts = thread_stat_findnew(sample->tid); + if (!ts) + return -ENOMEM; + + seq = get_seq(ts, addr); + if (!seq) + return -ENOMEM; + + switch (seq->state) { + case SEQ_STATE_UNINITIALIZED: + case SEQ_STATE_ACQUIRED: + break; + case SEQ_STATE_CONTENDED: + /* + * It can have nested contention begin with mutex spinning, + * then we would use the original contention begin event and + * ignore the second one. + */ + goto end; + case SEQ_STATE_ACQUIRING: + case SEQ_STATE_READ_ACQUIRED: + case SEQ_STATE_RELEASED: + /* broken lock sequence */ + if (!ls->broken) { + ls->broken = 1; + bad_hist[BROKEN_CONTENDED]++; + } + list_del_init(&seq->list); + free(seq); + goto end; + default: + BUG_ON("Unknown state of lock sequence found!\n"); + break; + } + + if (seq->state != SEQ_STATE_CONTENDED) { + seq->state = SEQ_STATE_CONTENDED; + seq->prev_event_time = sample->time; + ls->nr_contended++; + } +end: + return 0; +} + +static int report_lock_contention_end_event(struct evsel *evsel, + struct perf_sample *sample) +{ + struct lock_stat *ls; + struct thread_stat *ts; + struct lock_seq_stat *seq; + u64 contended_term; + u64 addr = evsel__intval(evsel, sample, "lock_addr"); + u64 key; + + switch (aggr_mode) { + case LOCK_AGGR_ADDR: + key = addr; + break; + case LOCK_AGGR_TASK: + key = sample->tid; + break; + case LOCK_AGGR_CALLER: + key = callchain_id(evsel, sample); + break; + default: + pr_err("Invalid aggregation mode: %d\n", aggr_mode); + return -EINVAL; + } + + ls = lock_stat_find(key); + if (!ls) + return 0; + + ts = thread_stat_find(sample->tid); + if (!ts) + return 0; + + seq = get_seq(ts, addr); + if (!seq) + return -ENOMEM; + + switch (seq->state) { + case SEQ_STATE_UNINITIALIZED: + goto end; + case SEQ_STATE_CONTENDED: + contended_term = sample->time - seq->prev_event_time; + ls->wait_time_total += contended_term; + if (contended_term < ls->wait_time_min) + ls->wait_time_min = contended_term; + if (ls->wait_time_max < contended_term) + ls->wait_time_max = contended_term; + break; + case SEQ_STATE_ACQUIRING: + case SEQ_STATE_ACQUIRED: + case SEQ_STATE_READ_ACQUIRED: + case SEQ_STATE_RELEASED: + /* broken lock sequence */ + if (!ls->broken) { + ls->broken = 1; + bad_hist[BROKEN_ACQUIRED]++; + } + list_del_init(&seq->list); + free(seq); + goto end; + default: + BUG_ON("Unknown state of lock sequence found!\n"); + break; + } + + seq->state = SEQ_STATE_ACQUIRED; + ls->nr_acquired++; + ls->avg_wait_time = ls->wait_time_total/ls->nr_acquired; +end: + return 0; +} + /* lock oriented handlers */ /* TODO: handlers for CPU oriented, thread oriented */ static struct trace_lock_handler report_lock_ops = { @@ -790,8 +1169,16 @@ static struct trace_lock_handler report_lock_ops = { .acquired_event = report_lock_acquired_event, .contended_event = report_lock_contended_event, .release_event = report_lock_release_event, + .contention_begin_event = report_lock_contention_begin_event, + .contention_end_event = report_lock_contention_end_event, }; +static struct trace_lock_handler contention_lock_ops = { + .contention_begin_event = report_lock_contention_begin_event, + .contention_end_event = report_lock_contention_end_event, +}; + + static struct trace_lock_handler *trace_handler; static int evsel__process_lock_acquire(struct evsel *evsel, struct perf_sample *sample) @@ -822,13 +1209,34 @@ static int evsel__process_lock_release(struct evsel *evsel, struct perf_sample * return 0; } +static int evsel__process_contention_begin(struct evsel *evsel, struct perf_sample *sample) +{ + if (trace_handler->contention_begin_event) + return trace_handler->contention_begin_event(evsel, sample); + return 0; +} + +static int evsel__process_contention_end(struct evsel *evsel, struct perf_sample *sample) +{ + if (trace_handler->contention_end_event) + return trace_handler->contention_end_event(evsel, sample); + return 0; +} + static void print_bad_events(int bad, int total) { /* Output for debug, this have to be removed */ int i; + int broken = 0; const char *name[4] = { "acquire", "acquired", "contended", "release" }; + for (i = 0; i < BROKEN_MAX; i++) + broken += bad_hist[i]; + + if (broken == 0 && !verbose) + return; + pr_info("\n=== output for debug===\n\n"); pr_info("bad: %d, total: %d\n", bad, total); pr_info("bad rate: %.2f %%\n", (double)bad / (double)total * 100); @@ -1016,6 +1424,83 @@ static void sort_result(void) } } +static const char *get_type_str(struct lock_stat *st) +{ + static const struct { + unsigned int flags; + const char *name; + } table[] = { + { 0, "semaphore" }, + { LCB_F_SPIN, "spinlock" }, + { LCB_F_SPIN | LCB_F_READ, "rwlock:R" }, + { LCB_F_SPIN | LCB_F_WRITE, "rwlock:W"}, + { LCB_F_READ, "rwsem:R" }, + { LCB_F_WRITE, "rwsem:W" }, + { LCB_F_RT, "rtmutex" }, + { LCB_F_RT | LCB_F_READ, "rwlock-rt:R" }, + { LCB_F_RT | LCB_F_WRITE, "rwlock-rt:W"}, + { LCB_F_PERCPU | LCB_F_READ, "pcpu-sem:R" }, + { LCB_F_PERCPU | LCB_F_WRITE, "pcpu-sem:W" }, + { LCB_F_MUTEX, "mutex" }, + { LCB_F_MUTEX | LCB_F_SPIN, "mutex" }, + }; + + for (unsigned int i = 0; i < ARRAY_SIZE(table); i++) { + if (table[i].flags == st->flags) + return table[i].name; + } + return "unknown"; +} + +static void sort_contention_result(void) +{ + sort_result(); +} + +static void print_contention_result(void) +{ + struct lock_stat *st; + struct lock_key *key; + int bad, total; + + list_for_each_entry(key, &lock_keys, list) + pr_info("%*s ", key->len, key->header); + + if (show_thread_stats) + pr_info(" %10s %s\n\n", "pid", "comm"); + else + pr_info(" %10s %s\n\n", "type", "caller"); + + bad = total = 0; + if (use_bpf) + bad = bad_hist[BROKEN_CONTENDED]; + + while ((st = pop_from_result())) { + total += use_bpf ? st->nr_contended : 1; + if (st->broken) + bad++; + + list_for_each_entry(key, &lock_keys, list) { + key->print(key, st); + pr_info(" "); + } + + if (show_thread_stats) { + struct thread *t; + int pid = st->addr; + + /* st->addr contains tid of thread */ + t = perf_session__findnew(session, pid); + pr_info(" %10d %s\n", pid, thread__comm_str(t)); + continue; + } + + pr_info(" %10s %s\n", get_type_str(st), st->name); + } + + print_bad_events(bad, total); +} + static const struct evsel_str_handler lock_tracepoints[] = { { "lock:lock_acquire", evsel__process_lock_acquire, }, /* CONFIG_LOCKDEP */ { "lock:lock_acquired", evsel__process_lock_acquired, }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */ @@ -1023,6 +1508,11 @@ static const struct evsel_str_handler lock_tracepoints[] = { { "lock:lock_release", evsel__process_lock_release, }, /* CONFIG_LOCKDEP */ }; +static const struct evsel_str_handler contention_tracepoints[] = { + { "lock:contention_begin", evsel__process_contention_begin, }, + { "lock:contention_end", evsel__process_contention_end, }, +}; + static bool force; static int __cmd_report(bool display_info) @@ -1031,6 +1521,7 @@ static int __cmd_report(bool display_info) struct perf_tool eops = { .sample = process_sample_event, .comm = perf_event__process_comm, + .mmap = perf_event__process_mmap, .namespaces = perf_event__process_namespaces, .ordered_events = true, }; @@ -1046,6 +1537,8 @@ static int __cmd_report(bool display_info) return PTR_ERR(session); } + /* for lock function check */ + symbol_conf.sort_by_name = true; symbol__init(&session->header.env); if (!perf_session__has_traces(session, "lock record")) @@ -1056,12 +1549,20 @@ static int __cmd_report(bool display_info) goto out_delete; } - if (setup_output_field(output_fields)) + if (perf_session__set_tracepoints_handlers(session, contention_tracepoints)) { + pr_err("Initializing perf session tracepoint handlers failed\n"); + goto out_delete; + } + + if (setup_output_field(false, output_fields)) goto out_delete; - if (select_key()) + if (select_key(false)) goto out_delete; + if (show_thread_stats) + aggr_mode = LOCK_AGGR_TASK; + err = perf_session__process_events(session); if (err) goto out_delete; @@ -1080,26 +1581,184 @@ out_delete: return err; } +static void sighandler(int sig __maybe_unused) +{ +} + +static int __cmd_contention(int argc, const char **argv) +{ + int err = -EINVAL; + struct perf_tool eops = { + .sample = process_sample_event, + .comm = perf_event__process_comm, + .mmap = perf_event__process_mmap, + .ordered_events = true, + }; + struct perf_data data = { + .path = input_name, + .mode = PERF_DATA_MODE_READ, + .force = force, + }; + struct lock_contention con = { + .target = &target, + .result = &lockhash_table[0], + .map_nr_entries = bpf_map_entries, + }; + + session = perf_session__new(use_bpf ? NULL : &data, &eops); + if (IS_ERR(session)) { + pr_err("Initializing perf session failed\n"); + return PTR_ERR(session); + } + + /* for lock function check */ + symbol_conf.sort_by_name = true; + symbol__init(&session->header.env); + + if (use_bpf) { + err = target__validate(&target); + if (err) { + char errbuf[512]; + + target__strerror(&target, err, errbuf, 512); + pr_err("%s\n", errbuf); + goto out_delete; + } + + signal(SIGINT, sighandler); + signal(SIGCHLD, sighandler); + signal(SIGTERM, sighandler); + + con.machine = &session->machines.host; + + con.evlist = evlist__new(); + if (con.evlist == NULL) { + err = -ENOMEM; + goto out_delete; + } + + err = evlist__create_maps(con.evlist, &target); + if (err < 0) + goto out_delete; + + if (argc) { + err = evlist__prepare_workload(con.evlist, &target, + argv, false, NULL); + if (err < 0) + goto out_delete; + } + + if (lock_contention_prepare(&con) < 0) { + pr_err("lock contention BPF setup failed\n"); + goto out_delete; + } + } else { + if (!perf_session__has_traces(session, "lock record")) + goto out_delete; + + if (!evlist__find_evsel_by_str(session->evlist, + "lock:contention_begin")) { + pr_err("lock contention evsel not found\n"); + goto out_delete; + } + + if (perf_session__set_tracepoints_handlers(session, + contention_tracepoints)) { + pr_err("Initializing perf session tracepoint handlers failed\n"); + goto out_delete; + } + } + + if (setup_output_field(true, output_fields)) + goto out_delete; + + if (select_key(true)) + goto out_delete; + + if (show_thread_stats) + aggr_mode = LOCK_AGGR_TASK; + else + aggr_mode = LOCK_AGGR_CALLER; + + if (use_bpf) { + lock_contention_start(); + if (argc) + evlist__start_workload(con.evlist); + + /* wait for signal */ + pause(); + + lock_contention_stop(); + lock_contention_read(&con); + + /* abuse bad hist stats for lost entries */ + bad_hist[BROKEN_CONTENDED] = con.lost; + } else { + err = perf_session__process_events(session); + if (err) + goto out_delete; + } + + setup_pager(); + + sort_contention_result(); + print_contention_result(); + +out_delete: + evlist__delete(con.evlist); + lock_contention_finish(); + perf_session__delete(session); + return err; +} + + static int __cmd_record(int argc, const char **argv) { const char *record_args[] = { "record", "-R", "-m", "1024", "-c", "1", "--synth", "task", }; + const char *callgraph_args[] = { + "--call-graph", "fp," __stringify(CONTENTION_STACK_DEPTH), + }; unsigned int rec_argc, i, j, ret; + unsigned int nr_tracepoints; + unsigned int nr_callgraph_args = 0; const char **rec_argv; + bool has_lock_stat = true; for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) { if (!is_valid_tracepoint(lock_tracepoints[i].name)) { - pr_err("tracepoint %s is not enabled. " - "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n", - lock_tracepoints[i].name); - return 1; + pr_debug("tracepoint %s is not enabled. " + "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n", + lock_tracepoints[i].name); + has_lock_stat = false; + break; + } + } + + if (has_lock_stat) + goto setup_args; + + for (i = 0; i < ARRAY_SIZE(contention_tracepoints); i++) { + if (!is_valid_tracepoint(contention_tracepoints[i].name)) { + pr_err("tracepoint %s is not enabled.\n", + contention_tracepoints[i].name); + return 1; } } - rec_argc = ARRAY_SIZE(record_args) + argc - 1; + nr_callgraph_args = ARRAY_SIZE(callgraph_args); + +setup_args: + rec_argc = ARRAY_SIZE(record_args) + nr_callgraph_args + argc - 1; + + if (has_lock_stat) + nr_tracepoints = ARRAY_SIZE(lock_tracepoints); + else + nr_tracepoints = ARRAY_SIZE(contention_tracepoints); + /* factor of 2 is for -e in front of each tracepoint */ - rec_argc += 2 * ARRAY_SIZE(lock_tracepoints); + rec_argc += 2 * nr_tracepoints; rec_argv = calloc(rec_argc + 1, sizeof(char *)); if (!rec_argv) @@ -1108,11 +1767,24 @@ static int __cmd_record(int argc, const char **argv) for (i = 0; i < ARRAY_SIZE(record_args); i++) rec_argv[i] = strdup(record_args[i]); - for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) { + for (j = 0; j < nr_tracepoints; j++) { + const char *ev_name; + + if (has_lock_stat) + ev_name = strdup(lock_tracepoints[j].name); + else + ev_name = strdup(contention_tracepoints[j].name); + + if (!ev_name) + return -ENOMEM; + rec_argv[i++] = "-e"; - rec_argv[i++] = strdup(lock_tracepoints[j].name); + rec_argv[i++] = ev_name; } + for (j = 0; j < nr_callgraph_args; j++, i++) + rec_argv[i] = callgraph_args[j]; + for (j = 1; j < (unsigned int)argc; j++, i++) rec_argv[i] = argv[j]; @@ -1123,6 +1795,24 @@ static int __cmd_record(int argc, const char **argv) return ret; } +static int parse_map_entry(const struct option *opt, const char *str, + int unset __maybe_unused) +{ + unsigned long *len = (unsigned long *)opt->value; + unsigned long val; + char *endptr; + + errno = 0; + val = strtoul(str, &endptr, 0); + if (*endptr != '\0' || errno != 0) { + pr_err("invalid BPF map length: %s\n", str); + return -1; + } + + *len = val; + return 0; +} + int cmd_lock(int argc, const char **argv) { const struct option lock_options[] = { @@ -1130,6 +1820,10 @@ int cmd_lock(int argc, const char **argv) OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"), OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"), OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), + OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name, + "file", "vmlinux pathname"), + OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name, + "file", "kallsyms pathname"), OPT_END() }; @@ -1154,12 +1848,34 @@ int cmd_lock(int argc, const char **argv) OPT_PARENT(lock_options) }; + struct option contention_options[] = { + OPT_STRING('k', "key", &sort_key, "wait_total", + "key for sorting (contended / wait_total / wait_max / wait_min / avg_wait)"), + OPT_STRING('F', "field", &output_fields, "contended,wait_total,wait_max,avg_wait", + "output fields (contended / wait_total / wait_max / wait_min / avg_wait)"), + OPT_BOOLEAN('t', "threads", &show_thread_stats, + "show per-thread lock stats"), + OPT_BOOLEAN('b', "use-bpf", &use_bpf, "use BPF program to collect lock contention stats"), + OPT_BOOLEAN('a', "all-cpus", &target.system_wide, + "System-wide collection from all CPUs"), + OPT_STRING('C', "cpu", &target.cpu_list, "cpu", + "List of cpus to monitor"), + OPT_STRING('p', "pid", &target.pid, "pid", + "Trace on existing process id"), + OPT_STRING(0, "tid", &target.tid, "tid", + "Trace on existing thread id (exclusive to --pid)"), + OPT_CALLBACK(0, "map-nr-entries", &bpf_map_entries, "num", + "Max number of BPF map entries", parse_map_entry), + OPT_PARENT(lock_options) + }; + const char * const info_usage[] = { "perf lock info [<options>]", NULL }; const char *const lock_subcommands[] = { "record", "report", "script", - "info", NULL }; + "info", "contention", + "contention", NULL }; const char *lock_usage[] = { NULL, NULL @@ -1168,6 +1884,10 @@ int cmd_lock(int argc, const char **argv) "perf lock report [<options>]", NULL }; + const char * const contention_usage[] = { + "perf lock contention [<options>]", + NULL + }; unsigned int i; int rc = 0; @@ -1203,6 +1923,20 @@ int cmd_lock(int argc, const char **argv) /* recycling report_lock_ops */ trace_handler = &report_lock_ops; rc = __cmd_report(true); + } else if (strlen(argv[0]) > 2 && strstarts("contention", argv[0])) { + trace_handler = &contention_lock_ops; + sort_key = "wait_total"; + output_fields = "contended,wait_total,wait_max,avg_wait"; + +#ifndef HAVE_BPF_SKEL + set_option_nobuild(contention_options, 'b', "use-bpf", + "no BUILD_BPF_SKEL=1", false); +#endif + if (argc) { + argc = parse_options(argc, argv, contention_options, + contention_usage, 0); + } + rc = __cmd_contention(argc, argv); } else { usage_with_options(lock_usage, lock_options); } |