![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
We need to do that to stop accumulating entries in the dead_threads linked list, i.e. we were keeping references to threads in struct hists that continue to exist even after a thread exited and was removed from the machine threads rbtree. We still keep the dead_threads list, but just for debugging, allowing us to iterate at any given point over the threads that still are referenced by things like struct hist_entry. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-3ejvfyed0r7ue61dkurzjux4@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
234 lines
4.6 KiB
C
234 lines
4.6 KiB
C
#include "../perf.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "session.h"
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#include "thread.h"
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#include "thread-stack.h"
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#include "util.h"
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#include "debug.h"
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#include "comm.h"
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#include "unwind.h"
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int thread__init_map_groups(struct thread *thread, struct machine *machine)
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{
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struct thread *leader;
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pid_t pid = thread->pid_;
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if (pid == thread->tid || pid == -1) {
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thread->mg = map_groups__new(machine);
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} else {
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leader = machine__findnew_thread(machine, pid, pid);
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if (leader)
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thread->mg = map_groups__get(leader->mg);
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}
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return thread->mg ? 0 : -1;
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}
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struct thread *thread__new(pid_t pid, pid_t tid)
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{
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char *comm_str;
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struct comm *comm;
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struct thread *thread = zalloc(sizeof(*thread));
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if (thread != NULL) {
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thread->pid_ = pid;
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thread->tid = tid;
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thread->ppid = -1;
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thread->cpu = -1;
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INIT_LIST_HEAD(&thread->comm_list);
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if (unwind__prepare_access(thread) < 0)
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goto err_thread;
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comm_str = malloc(32);
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if (!comm_str)
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goto err_thread;
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snprintf(comm_str, 32, ":%d", tid);
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comm = comm__new(comm_str, 0, false);
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free(comm_str);
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if (!comm)
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goto err_thread;
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list_add(&comm->list, &thread->comm_list);
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}
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return thread;
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err_thread:
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free(thread);
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return NULL;
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}
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void thread__delete(struct thread *thread)
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{
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struct comm *comm, *tmp;
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thread_stack__free(thread);
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if (thread->mg) {
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map_groups__put(thread->mg);
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thread->mg = NULL;
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}
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list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
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list_del(&comm->list);
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comm__free(comm);
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}
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unwind__finish_access(thread);
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free(thread);
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}
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struct thread *thread__get(struct thread *thread)
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{
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++thread->refcnt;
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return thread;
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}
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void thread__put(struct thread *thread)
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{
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if (thread && --thread->refcnt == 0) {
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list_del_init(&thread->node);
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thread__delete(thread);
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}
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}
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struct comm *thread__comm(const struct thread *thread)
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{
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if (list_empty(&thread->comm_list))
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return NULL;
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return list_first_entry(&thread->comm_list, struct comm, list);
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}
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struct comm *thread__exec_comm(const struct thread *thread)
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{
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struct comm *comm, *last = NULL;
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list_for_each_entry(comm, &thread->comm_list, list) {
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if (comm->exec)
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return comm;
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last = comm;
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}
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return last;
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}
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int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
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bool exec)
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{
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struct comm *new, *curr = thread__comm(thread);
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int err;
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/* Override the default :tid entry */
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if (!thread->comm_set) {
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err = comm__override(curr, str, timestamp, exec);
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if (err)
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return err;
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} else {
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new = comm__new(str, timestamp, exec);
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if (!new)
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return -ENOMEM;
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list_add(&new->list, &thread->comm_list);
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if (exec)
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unwind__flush_access(thread);
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}
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thread->comm_set = true;
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return 0;
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}
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const char *thread__comm_str(const struct thread *thread)
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{
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const struct comm *comm = thread__comm(thread);
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if (!comm)
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return NULL;
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return comm__str(comm);
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}
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/* CHECKME: it should probably better return the max comm len from its comm list */
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int thread__comm_len(struct thread *thread)
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{
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if (!thread->comm_len) {
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const char *comm = thread__comm_str(thread);
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if (!comm)
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return 0;
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thread->comm_len = strlen(comm);
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}
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return thread->comm_len;
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}
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size_t thread__fprintf(struct thread *thread, FILE *fp)
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{
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return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
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map_groups__fprintf(thread->mg, fp);
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}
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void thread__insert_map(struct thread *thread, struct map *map)
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{
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map_groups__fixup_overlappings(thread->mg, map, stderr);
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map_groups__insert(thread->mg, map);
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}
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static int thread__clone_map_groups(struct thread *thread,
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struct thread *parent)
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{
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int i;
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/* This is new thread, we share map groups for process. */
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if (thread->pid_ == parent->pid_)
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return 0;
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/* But this one is new process, copy maps. */
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for (i = 0; i < MAP__NR_TYPES; ++i)
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if (map_groups__clone(thread->mg, parent->mg, i) < 0)
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return -ENOMEM;
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return 0;
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}
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int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
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{
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int err;
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if (parent->comm_set) {
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const char *comm = thread__comm_str(parent);
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if (!comm)
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return -ENOMEM;
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err = thread__set_comm(thread, comm, timestamp);
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if (err)
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return err;
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thread->comm_set = true;
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}
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thread->ppid = parent->tid;
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return thread__clone_map_groups(thread, parent);
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}
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void thread__find_cpumode_addr_location(struct thread *thread,
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enum map_type type, u64 addr,
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struct addr_location *al)
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{
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size_t i;
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const u8 const cpumodes[] = {
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PERF_RECORD_MISC_USER,
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PERF_RECORD_MISC_KERNEL,
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PERF_RECORD_MISC_GUEST_USER,
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PERF_RECORD_MISC_GUEST_KERNEL
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};
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for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
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thread__find_addr_location(thread, cpumodes[i], type, addr, al);
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if (al->map)
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break;
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}
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}
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