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Message-ID: <20260119175833.340369-8-swapnil.sapkal@amd.com>
Date: Mon, 19 Jan 2026 17:58:29 +0000
From: Swapnil Sapkal <swapnil.sapkal@....com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
<namhyung@...nel.org>, <irogers@...gle.com>, <james.clark@....com>
CC: <ravi.bangoria@....com>, <swapnil.sapkal@....com>, <yu.c.chen@...el.com>,
<mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
<jolsa@...nel.org>, <rostedt@...dmis.org>, <vincent.guittot@...aro.org>,
<adrian.hunter@...el.com>, <kan.liang@...ux.intel.com>,
<gautham.shenoy@....com>, <kprateek.nayak@....com>, <juri.lelli@...hat.com>,
<yangjihong@...edance.com>, <void@...ifault.com>, <tj@...nel.org>,
<sshegde@...ux.ibm.com>, <ctshao@...gle.com>, <quic_zhonhan@...cinc.com>,
<thomas.falcon@...el.com>, <blakejones@...gle.com>, <ashelat@...hat.com>,
<leo.yan@....com>, <dvyukov@...gle.com>, <ak@...ux.intel.com>,
<yujie.liu@...el.com>, <graham.woodward@....com>, <ben.gainey@....com>,
<vineethr@...ux.ibm.com>, <tim.c.chen@...ux.intel.com>, <linux@...blig.org>,
<santosh.shukla@....com>, <sandipan.das@....com>,
<linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>, "James
Clark" <james.clark@...aro.org>
Subject: [PATCH v5 07/10] perf sched stats: Add support for live mode
The live mode works similar to simple `perf stat` command, by profiling
the target and printing results on the terminal as soon as the target
finishes.
Example usage:
# perf sched stats -- true
Description
----------------------------------------------------------------------------------------------------
DESC -> Description of the field
COUNT -> Value of the field
PCT_CHANGE -> Percent change with corresponding base value
AVG_JIFFIES -> Avg time in jiffies between two consecutive occurrence of event
----------------------------------------------------------------------------------------------------
Time elapsed (in jiffies) : 1
----------------------------------------------------------------------------------------------------
CPU: <ALL CPUS SUMMARY>
----------------------------------------------------------------------------------------------------
DESC COUNT PCT_CHANGE
----------------------------------------------------------------------------------------------------
yld_count : 0
array_exp : 0
sched_count : 0
sched_goidle : 0 ( 0.00% )
ttwu_count : 0
ttwu_local : 0 ( 0.00% )
rq_cpu_time : 27875
run_delay : 0 ( 0.00% )
pcount : 0
----------------------------------------------------------------------------------------------------
CPU: <ALL CPUS SUMMARY> | DOMAIN: SMT
----------------------------------------------------------------------------------------------------
DESC COUNT AVG_JIFFIES
----------------------------------------- <Category busy> ------------------------------------------
busy_lb_count : 0 $ 0.00 $
busy_lb_balanced : 0 $ 0.00 $
busy_lb_failed : 0 $ 0.00 $
busy_lb_imbalance_load : 0
busy_lb_imbalance_util : 0
busy_lb_imbalance_task : 0
busy_lb_imbalance_misfit : 0
busy_lb_gained : 0
busy_lb_hot_gained : 0
busy_lb_nobusyq : 0 $ 0.00 $
busy_lb_nobusyg : 0 $ 0.00 $
*busy_lb_success_count : 0
*busy_lb_avg_pulled : 0.00
... and so on. Output will show similar data for all the cpus in the
system.
Co-developed-by: Ravi Bangoria <ravi.bangoria@....com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@....com>
Tested-by: James Clark <james.clark@...aro.org>
Signed-off-by: Swapnil Sapkal <swapnil.sapkal@....com>
---
tools/perf/builtin-sched.c | 99 +++++++++++++++++++++++++++++++++++++-
tools/perf/util/header.c | 3 +-
tools/perf/util/header.h | 3 ++
3 files changed, 102 insertions(+), 3 deletions(-)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index c6b054b9b12a..8993308439bc 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -4426,6 +4426,103 @@ static int perf_sched__schedstat_report(struct perf_sched *sched)
return err;
}
+static int process_synthesized_event_live(const struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine __maybe_unused)
+{
+ return perf_sched__process_schedstat(tool, NULL, event);
+}
+
+static int perf_sched__schedstat_live(struct perf_sched *sched,
+ int argc, const char **argv)
+{
+ struct cpu_domain_map **cd_map = NULL;
+ struct target target = {};
+ u32 __maybe_unused md;
+ struct evlist *evlist;
+ u32 nr = 0, sv;
+ int reset = 0;
+ int err = 0;
+
+ signal(SIGINT, sighandler);
+ signal(SIGCHLD, sighandler);
+ signal(SIGTERM, sighandler);
+
+ evlist = evlist__new();
+ if (!evlist)
+ return -ENOMEM;
+
+ /*
+ * `perf sched schedstat` does not support workload profiling (-p pid)
+ * since /proc/schedstat file contains cpu specific data only. Hence, a
+ * profile target is either set of cpus or systemwide, never a process.
+ * Note that, although `-- <workload>` is supported, profile data are
+ * still cpu/systemwide.
+ */
+ if (cpu_list)
+ target.cpu_list = cpu_list;
+ else
+ target.system_wide = true;
+
+ if (argc) {
+ err = evlist__prepare_workload(evlist, &target, argv, false, NULL);
+ if (err)
+ goto out;
+ }
+
+ err = evlist__create_maps(evlist, &target);
+ if (err < 0)
+ goto out;
+
+ user_requested_cpus = evlist->core.user_requested_cpus;
+
+ err = perf_event__synthesize_schedstat(&(sched->tool),
+ process_synthesized_event_live,
+ user_requested_cpus);
+ if (err < 0)
+ goto out;
+
+ err = enable_sched_schedstats(&reset);
+ if (err < 0)
+ goto out;
+
+ if (argc)
+ evlist__start_workload(evlist);
+
+ /* wait for signal */
+ pause();
+
+ if (reset) {
+ err = disable_sched_schedstat();
+ if (err < 0)
+ goto out;
+ }
+
+ err = perf_event__synthesize_schedstat(&(sched->tool),
+ process_synthesized_event_live,
+ user_requested_cpus);
+ if (err)
+ goto out;
+
+ setup_pager();
+
+ if (list_empty(&cpu_head)) {
+ pr_err("Data is not available\n");
+ err = -1;
+ goto out;
+ }
+
+ nr = cpu__max_present_cpu().cpu;
+ cd_map = build_cpu_domain_map(&sv, &md, nr);
+ show_schedstat_data(&cpu_head, cd_map);
+out:
+ free_cpu_domain_info(cd_map, sv, nr);
+ free_schedstat(&cpu_head);
+ evlist__delete(evlist);
+ return err;
+}
+
static bool schedstat_events_exposed(void)
{
/*
@@ -4751,7 +4848,7 @@ int cmd_sched(int argc, const char **argv)
stats_usage, 0);
return perf_sched__schedstat_report(&sched);
}
- usage_with_options(stats_usage, stats_options);
+ return perf_sched__schedstat_live(&sched, argc, argv);
} else {
usage_with_options(sched_usage, sched_options);
}
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 673d53bb2a2c..9a15dd4b7640 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1614,8 +1614,7 @@ static int write_pmu_caps(struct feat_fd *ff,
return 0;
}
-static struct cpu_domain_map **build_cpu_domain_map(u32 *schedstat_version, u32 *max_sched_domains,
- u32 nr)
+struct cpu_domain_map **build_cpu_domain_map(u32 *schedstat_version, u32 *max_sched_domains, u32 nr)
{
struct domain_info *domain_info;
struct cpu_domain_map **cd_map;
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index c62f3275a80f..36cc74e2d14d 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -211,4 +211,7 @@ char *get_cpuid_str(struct perf_cpu cpu);
char *get_cpuid_allow_env_override(struct perf_cpu cpu);
int strcmp_cpuid_str(const char *s1, const char *s2);
+
+struct cpu_domain_map **build_cpu_domain_map(u32 *schedstat_version, u32 *max_sched_domains,
+ u32 nr);
#endif /* __PERF_HEADER_H */
--
2.43.0
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