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SubjectRe: [PATCH 12/12] perf report: Add --task option to display monitored tasks
Em Sun, Jan 07, 2018 at 05:03:56PM +0100, Jiri Olsa escreveu:
> Adding --task option to display monitored tasks stored
> in perf.data. Displaying pid/tid/ppid plus the command
> string aligned to distinguish parent and child tasks.

I'm making this --tasks, plural, but then you can also use --task :-)

- Arnaldo

> $ perf record -a
> ...
> $ perf report --task
> # 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
>
> Link: http://lkml.kernel.org/n/tip-ehvadnmg8b3kdhvgsbuesbr7@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
> tools/perf/Documentation/perf-report.txt | 4 +
> tools/perf/builtin-report.c | 136 ++++++++++++++++++++++++++++++-
> 2 files changed, 138 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
> index b0d70bf4ddfe..dcf0d154918f 100644
> --- a/tools/perf/Documentation/perf-report.txt
> +++ b/tools/perf/Documentation/perf-report.txt
> @@ -441,6 +441,10 @@ include::itrace.txt[]
> Display overall events statistics without any further processing.
> (like the one at the end of the perf report -D command)
>
> +--task::
> + Display monitored tasks stored in perf data. Displaying pid/tid/ppid
> + plus the command string aligned to distinguish parent and child tasks.
> +
> include::callchain-overhead-calculation.txt[]
>
> SEE ALSO
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index 11d303494b0c..f2ca2cbe63c1 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -15,6 +15,7 @@
> #include "util/color.h"
> #include <linux/list.h>
> #include <linux/rbtree.h>
> +#include <linux/err.h>
> #include "util/symbol.h"
> #include "util/callchain.h"
> #include "util/values.h"
> @@ -61,6 +62,7 @@ struct report {
> bool inverted_callchain;
> bool mem_mode;
> bool stat_mode;
> + bool task_mode;
> bool header;
> bool header_only;
> bool nonany_branch_mode;
> @@ -598,6 +600,124 @@ static int stat_print(struct report *rep)
> return 0;
> }
>
> +static void task_setup(struct report *rep)
> +{
> + memset(&rep->tool, 0, sizeof(rep->tool));
> + rep->tool.comm = perf_event__process_comm;
> + rep->tool.exit = perf_event__process_exit;
> + rep->tool.fork = perf_event__process_fork;
> + rep->tool.no_warn = true;
> +}
> +
> +struct task {
> + struct thread *thread;
> + struct list_head list;
> + struct list_head children;
> +};
> +
> +static struct task *task_list(struct task *task, struct machine *machine)
> +{
> + struct thread *parent_thread, *thread = task->thread;
> + struct task *parent_task;
> +
> + /* Already listed. */
> + if (!list_empty(&task->list))
> + return NULL;
> +
> + /* Last one in the chain. */
> + if (thread->ppid == -1)
> + return task;
> +
> + parent_thread = machine__findnew_thread(machine, -1, thread->ppid);
> + if (!parent_thread)
> + return ERR_PTR(-ENOMEM);
> +
> + parent_task = thread__priv(parent_thread);
> + list_add_tail(&task->list, &parent_task->children);
> + return task_list(parent_task, machine);
> +}
> +
> +static void task__print_level(struct task *task, FILE *fp, int level)
> +{
> + struct thread *thread = task->thread;
> + struct task *child;
> +
> + fprintf(fp, " %8d %8d %8d |%*s%s\n",
> + thread->pid_, thread->tid, thread->ppid,
> + level, "", thread__comm_str(thread));
> +
> + if (!list_empty(&task->children)) {
> + list_for_each_entry(child, &task->children, list)
> + task__print_level(child, fp, level + 1);
> + }
> +}
> +
> +static int task_print(struct report *rep, FILE *fp)
> +{
> + struct perf_session *session = rep->session;
> + struct machine *machine = &session->machines.host;
> + struct task *tasks, *task;
> + unsigned int nr = 0, itask = 0, i;
> + struct rb_node *nd;
> + LIST_HEAD(list);
> +
> + /*
> + * No locking needed while accessing machine->threads,
> + * because --task is single threaded command.
> + */
> +
> + /* Count all the threads. */
> + for (i = 0; i < THREADS__TABLE_SIZE; i++)
> + nr += machine->threads[i].nr;
> +
> + tasks = malloc(sizeof(*tasks) * nr);
> + if (!tasks)
> + return -ENOMEM;
> +
> + for (i = 0; i < THREADS__TABLE_SIZE; i++) {
> + struct threads *threads = &machine->threads[i];
> +
> + for (nd = rb_first(&threads->entries); nd; nd = rb_next(nd)) {
> + task = tasks + itask++;
> +
> + task->thread = rb_entry(nd, struct thread, rb_node);
> + INIT_LIST_HEAD(&task->children);
> + INIT_LIST_HEAD(&task->list);
> + thread__set_priv(task->thread, task);
> + }
> + }
> +
> + /*
> + * Iterate every task down to the unprocessed parent
> + * and link all in task children list. Task with no
> + * parent is added into 'list'.
> + */
> + for (itask = 0; itask < nr; itask++) {
> + task = tasks + itask;
> +
> + if (!list_empty(&task->list))
> + continue;
> +
> + task = task_list(task, machine);
> + if (IS_ERR(task)) {
> + pr_err("Error: failed to process tasks\n");
> + free(tasks);
> + return -ENOMEM;
> + }
> +
> + if (task)
> + list_add_tail(&task->list, &list);
> + }
> +
> + fprintf(fp, "# %8s %8s %8s %s\n", "pid", "tid", "ppid", "comm");
> +
> + list_for_each_entry(task, &list, list)
> + task__print_level(task, fp, 0);
> +
> + free(tasks);
> + return 0;
> +}
> +
> static int __cmd_report(struct report *rep)
> {
> int ret;
> @@ -632,6 +752,9 @@ static int __cmd_report(struct report *rep)
> if (rep->stat_mode)
> stat_setup(rep);
>
> + if (rep->task_mode)
> + task_setup(rep);
> +
> ret = perf_session__process_events(session);
> if (ret) {
> ui__error("failed to process sample\n");
> @@ -641,6 +764,9 @@ static int __cmd_report(struct report *rep)
> if (rep->stat_mode)
> return stat_print(rep);
>
> + if (rep->task_mode)
> + return task_print(rep, stdout);
> +
> report__warn_kptr_restrict(rep);
>
> evlist__for_each_entry(session->evlist, pos)
> @@ -798,6 +924,7 @@ int cmd_report(int argc, const char **argv)
> OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
> "dump raw trace in ASCII"),
> OPT_BOOLEAN(0, "stat", &report.stat_mode, "Display event stats"),
> + OPT_BOOLEAN(0, "task", &report.task_mode, "Display recorded tasks"),
> OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
> "file", "vmlinux pathname"),
> OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
> @@ -1059,8 +1186,12 @@ int cmd_report(int argc, const char **argv)
> report.tool.show_feat_hdr = SHOW_FEAT_HEADER;
> if (report.show_full_info)
> report.tool.show_feat_hdr = SHOW_FEAT_HEADER_FULL_INFO;
> - if (report.stat_mode)
> + if (report.stat_mode || report.task_mode)
> use_browser = 0;
> + if (report.stat_mode && report.task_mode) {
> + pr_err("Error: --task and --stat options cannot be used together\n");
> + goto error;
> + }
>
> if (strcmp(input_name, "-") != 0)
> setup_browser(true);
> @@ -1083,7 +1214,8 @@ int cmd_report(int argc, const char **argv)
> ret = 0;
> goto error;
> }
> - } else if (use_browser == 0 && !quiet && !report.stat_mode) {
> + } else if (use_browser == 0 && !quiet &&
> + !report.stat_mode && !report.task_mode) {
> fputs("# To display the perf.data header info, please use --header/--header-only options.\n#\n",
> stdout);
> }
> --
> 2.13.6

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