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Date: Mon, 8 Jan 2018 13:03:47 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
lkml <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
David Ahern <dsahern@...il.com>,
Andi Kleen <ak@...ux.intel.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [PATCH 12/12] perf report: Add --task option to display
monitored tasks
Em Mon, Jan 08, 2018 at 12:55:34PM -0300, Arnaldo Carvalho de Melo escreveu:
> 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 :-)
And tested it, nice new feature! :-)
- Arnaldo
> - 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@...nel.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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