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perf report: Add --tasks option to display monitored tasks
Add --tasks option to display monitored tasks stored in perf.data.
Displaying pid/tid/ppid plus the command string aligned to distinguish
parent and child tasks.
$ perf record -a
...
$ perf report --tasks
# pid tid ppid comm
0 0 -1 |swapper
2 2 0 | kthreadd
14080 14080 2 | kworker/u17:1
4 4 2 | kworker/0:0H
6 6 2 | mm_percpu_wq
...
1 1 0 | systemd
23242 23242 1 | firefox
23242 23298 23242 | Cache2 I/O
23242 23304 23242 | GMPThread
...
1195 1195 1 | login
1611 1611 1195 | bash
1639 1639 1611 | startx
1663 1663 1639 | xinit
1673 1673 1663 | xmonad-x86_64-l
23939 23939 1673 | xterm
23941 23941 23939 | bash
23963 23963 23941 | mutt
24954 24954 23963 | offlineimap
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180107160356.28203-13-jolsa@kernel.org
[ Make it --tasks, plural, --task works as well, as its unambiguous ]
[ Use machine__find_thread(), not findnew(), as pointed out by Namhyung ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa
Arnaldo Carvalho de Melo
parent
2d1073def3
commit
930f8b3479
@ -461,6 +461,10 @@ include::itrace.txt[]
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Display overall events statistics without any further processing.
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(like the one at the end of the perf report -D command)
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--tasks::
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Display monitored tasks stored in perf data. Displaying pid/tid/ppid
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plus the command string aligned to distinguish parent and child tasks.
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include::callchain-overhead-calculation.txt[]
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SEE ALSO
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@ -15,6 +15,7 @@
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#include "util/color.h"
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#include <linux/list.h>
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#include <linux/rbtree.h>
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#include <linux/err.h>
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#include "util/symbol.h"
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#include "util/callchain.h"
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#include "util/values.h"
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@ -63,6 +64,7 @@ struct report {
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bool inverted_callchain;
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bool mem_mode;
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bool stats_mode;
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bool tasks_mode;
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bool header;
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bool header_only;
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bool nonany_branch_mode;
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@ -603,6 +605,124 @@ static int stats_print(struct report *rep)
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return 0;
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}
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static void tasks_setup(struct report *rep)
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{
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memset(&rep->tool, 0, sizeof(rep->tool));
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rep->tool.comm = perf_event__process_comm;
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rep->tool.exit = perf_event__process_exit;
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rep->tool.fork = perf_event__process_fork;
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rep->tool.no_warn = true;
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}
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struct task {
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struct thread *thread;
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struct list_head list;
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struct list_head children;
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};
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static struct task *tasks_list(struct task *task, struct machine *machine)
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{
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struct thread *parent_thread, *thread = task->thread;
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struct task *parent_task;
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/* Already listed. */
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if (!list_empty(&task->list))
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return NULL;
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/* Last one in the chain. */
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if (thread->ppid == -1)
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return task;
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parent_thread = machine__find_thread(machine, -1, thread->ppid);
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if (!parent_thread)
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return ERR_PTR(-ENOENT);
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parent_task = thread__priv(parent_thread);
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list_add_tail(&task->list, &parent_task->children);
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return tasks_list(parent_task, machine);
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}
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static void task__print_level(struct task *task, FILE *fp, int level)
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{
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struct thread *thread = task->thread;
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struct task *child;
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fprintf(fp, " %8d %8d %8d |%*s%s\n",
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thread->pid_, thread->tid, thread->ppid,
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level, "", thread__comm_str(thread));
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if (!list_empty(&task->children)) {
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list_for_each_entry(child, &task->children, list)
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task__print_level(child, fp, level + 1);
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}
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}
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static int tasks_print(struct report *rep, FILE *fp)
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{
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struct perf_session *session = rep->session;
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struct machine *machine = &session->machines.host;
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struct task *tasks, *task;
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unsigned int nr = 0, itask = 0, i;
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struct rb_node *nd;
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LIST_HEAD(list);
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/*
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* No locking needed while accessing machine->threads,
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* because --tasks is single threaded command.
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*/
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/* Count all the threads. */
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for (i = 0; i < THREADS__TABLE_SIZE; i++)
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nr += machine->threads[i].nr;
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tasks = malloc(sizeof(*tasks) * nr);
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if (!tasks)
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return -ENOMEM;
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for (i = 0; i < THREADS__TABLE_SIZE; i++) {
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struct threads *threads = &machine->threads[i];
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for (nd = rb_first(&threads->entries); nd; nd = rb_next(nd)) {
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task = tasks + itask++;
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task->thread = rb_entry(nd, struct thread, rb_node);
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INIT_LIST_HEAD(&task->children);
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INIT_LIST_HEAD(&task->list);
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thread__set_priv(task->thread, task);
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}
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}
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/*
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* Iterate every task down to the unprocessed parent
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* and link all in task children list. Task with no
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* parent is added into 'list'.
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*/
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for (itask = 0; itask < nr; itask++) {
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task = tasks + itask;
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if (!list_empty(&task->list))
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continue;
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task = tasks_list(task, machine);
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if (IS_ERR(task)) {
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pr_err("Error: failed to process tasks\n");
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free(tasks);
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return PTR_ERR(task);
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}
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if (task)
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list_add_tail(&task->list, &list);
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}
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fprintf(fp, "# %8s %8s %8s %s\n", "pid", "tid", "ppid", "comm");
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list_for_each_entry(task, &list, list)
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task__print_level(task, fp, 0);
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free(tasks);
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return 0;
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}
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static int __cmd_report(struct report *rep)
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{
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int ret;
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@ -637,6 +757,9 @@ static int __cmd_report(struct report *rep)
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if (rep->stats_mode)
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stats_setup(rep);
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if (rep->tasks_mode)
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tasks_setup(rep);
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ret = perf_session__process_events(session);
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if (ret) {
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ui__error("failed to process sample\n");
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@ -646,6 +769,9 @@ static int __cmd_report(struct report *rep)
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if (rep->stats_mode)
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return stats_print(rep);
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if (rep->tasks_mode)
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return tasks_print(rep, stdout);
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report__warn_kptr_restrict(rep);
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evlist__for_each_entry(session->evlist, pos)
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@ -803,6 +929,7 @@ int cmd_report(int argc, const char **argv)
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OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
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"dump raw trace in ASCII"),
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OPT_BOOLEAN(0, "stats", &report.stats_mode, "Display event stats"),
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OPT_BOOLEAN(0, "tasks", &report.tasks_mode, "Display recorded tasks"),
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OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
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"file", "vmlinux pathname"),
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OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
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@ -1064,8 +1191,12 @@ repeat:
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report.tool.show_feat_hdr = SHOW_FEAT_HEADER;
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if (report.show_full_info)
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report.tool.show_feat_hdr = SHOW_FEAT_HEADER_FULL_INFO;
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if (report.stats_mode)
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if (report.stats_mode || report.tasks_mode)
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use_browser = 0;
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if (report.stats_mode && report.tasks_mode) {
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pr_err("Error: --tasks and --stats options cannot be used together\n");
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goto error;
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}
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if (strcmp(input_name, "-") != 0)
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setup_browser(true);
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@ -1088,7 +1219,8 @@ repeat:
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ret = 0;
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goto error;
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}
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} else if (use_browser == 0 && !quiet && !report.stats_mode) {
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} else if (use_browser == 0 && !quiet &&
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!report.stats_mode && !report.tasks_mode) {
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fputs("# To display the perf.data header info, please use --header/--header-only options.\n#\n",
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stdout);
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}
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