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-rw-r--r--tools/perf/util/thread.c497
1 files changed, 497 insertions, 0 deletions
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
new file mode 100644
index 0000000000..fe5e6991ae
--- /dev/null
+++ b/tools/perf/util/thread.c
@@ -0,0 +1,497 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <linux/kernel.h>
+#include <linux/zalloc.h>
+#include "dso.h"
+#include "session.h"
+#include "thread.h"
+#include "thread-stack.h"
+#include "debug.h"
+#include "namespaces.h"
+#include "comm.h"
+#include "map.h"
+#include "symbol.h"
+#include "unwind.h"
+#include "callchain.h"
+
+#include <api/fs/fs.h>
+
+int thread__init_maps(struct thread *thread, struct machine *machine)
+{
+ pid_t pid = thread__pid(thread);
+
+ if (pid == thread__tid(thread) || pid == -1) {
+ thread__set_maps(thread, maps__new(machine));
+ } else {
+ struct thread *leader = __machine__findnew_thread(machine, pid, pid);
+
+ if (leader) {
+ thread__set_maps(thread, maps__get(thread__maps(leader)));
+ thread__put(leader);
+ }
+ }
+
+ return thread__maps(thread) ? 0 : -1;
+}
+
+struct thread *thread__new(pid_t pid, pid_t tid)
+{
+ char *comm_str;
+ struct comm *comm;
+ RC_STRUCT(thread) *_thread = zalloc(sizeof(*_thread));
+ struct thread *thread;
+
+ if (ADD_RC_CHK(thread, _thread) != NULL) {
+ thread__set_pid(thread, pid);
+ thread__set_tid(thread, tid);
+ thread__set_ppid(thread, -1);
+ thread__set_cpu(thread, -1);
+ thread__set_guest_cpu(thread, -1);
+ thread__set_lbr_stitch_enable(thread, false);
+ INIT_LIST_HEAD(thread__namespaces_list(thread));
+ INIT_LIST_HEAD(thread__comm_list(thread));
+ init_rwsem(thread__namespaces_lock(thread));
+ init_rwsem(thread__comm_lock(thread));
+
+ comm_str = malloc(32);
+ if (!comm_str)
+ goto err_thread;
+
+ snprintf(comm_str, 32, ":%d", tid);
+ comm = comm__new(comm_str, 0, false);
+ free(comm_str);
+ if (!comm)
+ goto err_thread;
+
+ list_add(&comm->list, thread__comm_list(thread));
+ refcount_set(thread__refcnt(thread), 1);
+ /* Thread holds first ref to nsdata. */
+ RC_CHK_ACCESS(thread)->nsinfo = nsinfo__new(pid);
+ srccode_state_init(thread__srccode_state(thread));
+ }
+
+ return thread;
+
+err_thread:
+ free(thread);
+ return NULL;
+}
+
+static void (*thread__priv_destructor)(void *priv);
+
+void thread__set_priv_destructor(void (*destructor)(void *priv))
+{
+ assert(thread__priv_destructor == NULL);
+
+ thread__priv_destructor = destructor;
+}
+
+void thread__delete(struct thread *thread)
+{
+ struct namespaces *namespaces, *tmp_namespaces;
+ struct comm *comm, *tmp_comm;
+
+ thread_stack__free(thread);
+
+ if (thread__maps(thread)) {
+ maps__put(thread__maps(thread));
+ thread__set_maps(thread, NULL);
+ }
+ down_write(thread__namespaces_lock(thread));
+ list_for_each_entry_safe(namespaces, tmp_namespaces,
+ thread__namespaces_list(thread), list) {
+ list_del_init(&namespaces->list);
+ namespaces__free(namespaces);
+ }
+ up_write(thread__namespaces_lock(thread));
+
+ down_write(thread__comm_lock(thread));
+ list_for_each_entry_safe(comm, tmp_comm, thread__comm_list(thread), list) {
+ list_del_init(&comm->list);
+ comm__free(comm);
+ }
+ up_write(thread__comm_lock(thread));
+
+ nsinfo__zput(RC_CHK_ACCESS(thread)->nsinfo);
+ srccode_state_free(thread__srccode_state(thread));
+
+ exit_rwsem(thread__namespaces_lock(thread));
+ exit_rwsem(thread__comm_lock(thread));
+ thread__free_stitch_list(thread);
+
+ if (thread__priv_destructor)
+ thread__priv_destructor(thread__priv(thread));
+
+ RC_CHK_FREE(thread);
+}
+
+struct thread *thread__get(struct thread *thread)
+{
+ struct thread *result;
+
+ if (RC_CHK_GET(result, thread))
+ refcount_inc(thread__refcnt(thread));
+
+ return result;
+}
+
+void thread__put(struct thread *thread)
+{
+ if (thread && refcount_dec_and_test(thread__refcnt(thread)))
+ thread__delete(thread);
+ else
+ RC_CHK_PUT(thread);
+}
+
+static struct namespaces *__thread__namespaces(struct thread *thread)
+{
+ if (list_empty(thread__namespaces_list(thread)))
+ return NULL;
+
+ return list_first_entry(thread__namespaces_list(thread), struct namespaces, list);
+}
+
+struct namespaces *thread__namespaces(struct thread *thread)
+{
+ struct namespaces *ns;
+
+ down_read(thread__namespaces_lock(thread));
+ ns = __thread__namespaces(thread);
+ up_read(thread__namespaces_lock(thread));
+
+ return ns;
+}
+
+static int __thread__set_namespaces(struct thread *thread, u64 timestamp,
+ struct perf_record_namespaces *event)
+{
+ struct namespaces *new, *curr = __thread__namespaces(thread);
+
+ new = namespaces__new(event);
+ if (!new)
+ return -ENOMEM;
+
+ list_add(&new->list, thread__namespaces_list(thread));
+
+ if (timestamp && curr) {
+ /*
+ * setns syscall must have changed few or all the namespaces
+ * of this thread. Update end time for the namespaces
+ * previously used.
+ */
+ curr = list_next_entry(new, list);
+ curr->end_time = timestamp;
+ }
+
+ return 0;
+}
+
+int thread__set_namespaces(struct thread *thread, u64 timestamp,
+ struct perf_record_namespaces *event)
+{
+ int ret;
+
+ down_write(thread__namespaces_lock(thread));
+ ret = __thread__set_namespaces(thread, timestamp, event);
+ up_write(thread__namespaces_lock(thread));
+ return ret;
+}
+
+struct comm *thread__comm(struct thread *thread)
+{
+ if (list_empty(thread__comm_list(thread)))
+ return NULL;
+
+ return list_first_entry(thread__comm_list(thread), struct comm, list);
+}
+
+struct comm *thread__exec_comm(struct thread *thread)
+{
+ struct comm *comm, *last = NULL, *second_last = NULL;
+
+ list_for_each_entry(comm, thread__comm_list(thread), list) {
+ if (comm->exec)
+ return comm;
+ second_last = last;
+ last = comm;
+ }
+
+ /*
+ * 'last' with no start time might be the parent's comm of a synthesized
+ * thread (created by processing a synthesized fork event). For a main
+ * thread, that is very probably wrong. Prefer a later comm to avoid
+ * that case.
+ */
+ if (second_last && !last->start && thread__pid(thread) == thread__tid(thread))
+ return second_last;
+
+ return last;
+}
+
+static int ____thread__set_comm(struct thread *thread, const char *str,
+ u64 timestamp, bool exec)
+{
+ struct comm *new, *curr = thread__comm(thread);
+
+ /* Override the default :tid entry */
+ if (!thread__comm_set(thread)) {
+ int err = comm__override(curr, str, timestamp, exec);
+ if (err)
+ return err;
+ } else {
+ new = comm__new(str, timestamp, exec);
+ if (!new)
+ return -ENOMEM;
+ list_add(&new->list, thread__comm_list(thread));
+
+ if (exec)
+ unwind__flush_access(thread__maps(thread));
+ }
+
+ thread__set_comm_set(thread, true);
+
+ return 0;
+}
+
+int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
+ bool exec)
+{
+ int ret;
+
+ down_write(thread__comm_lock(thread));
+ ret = ____thread__set_comm(thread, str, timestamp, exec);
+ up_write(thread__comm_lock(thread));
+ return ret;
+}
+
+int thread__set_comm_from_proc(struct thread *thread)
+{
+ char path[64];
+ char *comm = NULL;
+ size_t sz;
+ int err = -1;
+
+ if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
+ thread__pid(thread), thread__tid(thread)) >= (int)sizeof(path)) &&
+ procfs__read_str(path, &comm, &sz) == 0) {
+ comm[sz - 1] = '\0';
+ err = thread__set_comm(thread, comm, 0);
+ }
+
+ return err;
+}
+
+static const char *__thread__comm_str(struct thread *thread)
+{
+ const struct comm *comm = thread__comm(thread);
+
+ if (!comm)
+ return NULL;
+
+ return comm__str(comm);
+}
+
+const char *thread__comm_str(struct thread *thread)
+{
+ const char *str;
+
+ down_read(thread__comm_lock(thread));
+ str = __thread__comm_str(thread);
+ up_read(thread__comm_lock(thread));
+
+ return str;
+}
+
+static int __thread__comm_len(struct thread *thread, const char *comm)
+{
+ if (!comm)
+ return 0;
+ thread__set_comm_len(thread, strlen(comm));
+
+ return thread__var_comm_len(thread);
+}
+
+/* CHECKME: it should probably better return the max comm len from its comm list */
+int thread__comm_len(struct thread *thread)
+{
+ int comm_len = thread__var_comm_len(thread);
+
+ if (!comm_len) {
+ const char *comm;
+
+ down_read(thread__comm_lock(thread));
+ comm = __thread__comm_str(thread);
+ comm_len = __thread__comm_len(thread, comm);
+ up_read(thread__comm_lock(thread));
+ }
+
+ return comm_len;
+}
+
+size_t thread__fprintf(struct thread *thread, FILE *fp)
+{
+ return fprintf(fp, "Thread %d %s\n", thread__tid(thread), thread__comm_str(thread)) +
+ maps__fprintf(thread__maps(thread), fp);
+}
+
+int thread__insert_map(struct thread *thread, struct map *map)
+{
+ int ret;
+
+ ret = unwind__prepare_access(thread__maps(thread), map, NULL);
+ if (ret)
+ return ret;
+
+ maps__fixup_overlappings(thread__maps(thread), map, stderr);
+ return maps__insert(thread__maps(thread), map);
+}
+
+static int __thread__prepare_access(struct thread *thread)
+{
+ bool initialized = false;
+ int err = 0;
+ struct maps *maps = thread__maps(thread);
+ struct map_rb_node *rb_node;
+
+ down_read(maps__lock(maps));
+
+ maps__for_each_entry(maps, rb_node) {
+ err = unwind__prepare_access(thread__maps(thread), rb_node->map, &initialized);
+ if (err || initialized)
+ break;
+ }
+
+ up_read(maps__lock(maps));
+
+ return err;
+}
+
+static int thread__prepare_access(struct thread *thread)
+{
+ int err = 0;
+
+ if (dwarf_callchain_users)
+ err = __thread__prepare_access(thread);
+
+ return err;
+}
+
+static int thread__clone_maps(struct thread *thread, struct thread *parent, bool do_maps_clone)
+{
+ /* This is new thread, we share map groups for process. */
+ if (thread__pid(thread) == thread__pid(parent))
+ return thread__prepare_access(thread);
+
+ if (thread__maps(thread) == thread__maps(parent)) {
+ pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
+ thread__pid(thread), thread__tid(thread),
+ thread__pid(parent), thread__tid(parent));
+ return 0;
+ }
+ /* But this one is new process, copy maps. */
+ return do_maps_clone ? maps__clone(thread, thread__maps(parent)) : 0;
+}
+
+int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp, bool do_maps_clone)
+{
+ if (thread__comm_set(parent)) {
+ const char *comm = thread__comm_str(parent);
+ int err;
+ if (!comm)
+ return -ENOMEM;
+ err = thread__set_comm(thread, comm, timestamp);
+ if (err)
+ return err;
+ }
+
+ thread__set_ppid(thread, thread__tid(parent));
+ return thread__clone_maps(thread, parent, do_maps_clone);
+}
+
+void thread__find_cpumode_addr_location(struct thread *thread, u64 addr,
+ struct addr_location *al)
+{
+ size_t i;
+ const u8 cpumodes[] = {
+ PERF_RECORD_MISC_USER,
+ PERF_RECORD_MISC_KERNEL,
+ PERF_RECORD_MISC_GUEST_USER,
+ PERF_RECORD_MISC_GUEST_KERNEL
+ };
+
+ for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
+ thread__find_symbol(thread, cpumodes[i], addr, al);
+ if (al->map)
+ break;
+ }
+}
+
+struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
+{
+ if (thread__pid(thread) == thread__tid(thread))
+ return thread__get(thread);
+
+ if (thread__pid(thread) == -1)
+ return NULL;
+
+ return machine__find_thread(machine, thread__pid(thread), thread__pid(thread));
+}
+
+int thread__memcpy(struct thread *thread, struct machine *machine,
+ void *buf, u64 ip, int len, bool *is64bit)
+{
+ u8 cpumode = PERF_RECORD_MISC_USER;
+ struct addr_location al;
+ struct dso *dso;
+ long offset;
+
+ if (machine__kernel_ip(machine, ip))
+ cpumode = PERF_RECORD_MISC_KERNEL;
+
+ addr_location__init(&al);
+ if (!thread__find_map(thread, cpumode, ip, &al)) {
+ addr_location__exit(&al);
+ return -1;
+ }
+
+ dso = map__dso(al.map);
+
+ if (!dso || dso->data.status == DSO_DATA_STATUS_ERROR || map__load(al.map) < 0) {
+ addr_location__exit(&al);
+ return -1;
+ }
+
+ offset = map__map_ip(al.map, ip);
+ if (is64bit)
+ *is64bit = dso->is_64_bit;
+
+ addr_location__exit(&al);
+
+ return dso__data_read_offset(dso, machine, offset, buf, len);
+}
+
+void thread__free_stitch_list(struct thread *thread)
+{
+ struct lbr_stitch *lbr_stitch = thread__lbr_stitch(thread);
+ struct stitch_list *pos, *tmp;
+
+ if (!lbr_stitch)
+ return;
+
+ list_for_each_entry_safe(pos, tmp, &lbr_stitch->lists, node) {
+ list_del_init(&pos->node);
+ free(pos);
+ }
+
+ list_for_each_entry_safe(pos, tmp, &lbr_stitch->free_lists, node) {
+ list_del_init(&pos->node);
+ free(pos);
+ }
+
+ zfree(&lbr_stitch->prev_lbr_cursor);
+ free(thread__lbr_stitch(thread));
+ thread__set_lbr_stitch(thread, NULL);
+}