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Date: Sat, 12 Aug 2023 08:49:16 +0000
From: Yang Jihong <yangjihong1@...wei.com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
<mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
<jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
<adrian.hunter@...el.com>, <kan.liang@...ux.intel.com>,
<sandipan.das@....com>, <ravi.bangoria@....com>,
<linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
CC: <yangjihong1@...wei.com>
Subject: [RFC v1 15/16] perf kwork top: Add BPF-based statistics on hardirq event support
Use bpf to collect statistics on hardirq events based on perf BPF skeletons.
Example usage:
# perf kwork top -k sched,irq -b
Starting trace, Hit <Ctrl+C> to stop and report
^C
Total : 136717.945 ms, 8 cpus
%Cpu(s): 17.10% id, 0.01% hi, 0.00% si
%Cpu0 [||||||||||||||||||||||||| 84.26%]
%Cpu1 [||||||||||||||||||||||||| 84.77%]
%Cpu2 [|||||||||||||||||||||||| 83.22%]
%Cpu3 [|||||||||||||||||||||||| 80.37%]
%Cpu4 [|||||||||||||||||||||||| 81.49%]
%Cpu5 [||||||||||||||||||||||||| 84.68%]
%Cpu6 [||||||||||||||||||||||||| 84.48%]
%Cpu7 [|||||||||||||||||||||||| 80.21%]
PID SPID %CPU RUNTIME COMMMAND
-------------------------------------------------------------
0 0 19.78 3482.833 ms [swapper/7]
0 0 19.62 3454.219 ms [swapper/3]
0 0 18.50 3258.339 ms [swapper/4]
0 0 16.76 2842.749 ms [swapper/2]
0 0 15.71 2627.905 ms [swapper/0]
0 0 15.51 2598.206 ms [swapper/6]
0 0 15.31 2561.820 ms [swapper/5]
0 0 15.22 2548.708 ms [swapper/1]
13253 13018 2.95 513.108 ms sched-messaging
13092 13018 2.67 454.167 ms sched-messaging
13401 13018 2.66 454.790 ms sched-messaging
13240 13018 2.64 454.587 ms sched-messaging
13251 13018 2.61 442.273 ms sched-messaging
13075 13018 2.61 438.932 ms sched-messaging
13220 13018 2.60 443.245 ms sched-messaging
13235 13018 2.59 443.268 ms sched-messaging
13222 13018 2.50 426.344 ms sched-messaging
13410 13018 2.49 426.191 ms sched-messaging
13228 13018 2.46 425.121 ms sched-messaging
13379 13018 2.38 409.950 ms sched-messaging
13236 13018 2.37 413.159 ms sched-messaging
13095 13018 2.36 396.572 ms sched-messaging
13325 13018 2.35 408.089 ms sched-messaging
13242 13018 2.32 394.750 ms sched-messaging
13386 13018 2.31 396.997 ms sched-messaging
13046 13018 2.29 383.833 ms sched-messaging
13109 13018 2.28 388.482 ms sched-messaging
13388 13018 2.28 393.576 ms sched-messaging
13238 13018 2.26 388.487 ms sched-messaging
<SNIP>
Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
tools/perf/util/bpf_kwork_top.c | 11 ++++
tools/perf/util/bpf_skel/kwork_top.bpf.c | 79 ++++++++++++++++++++++++
2 files changed, 90 insertions(+)
diff --git a/tools/perf/util/bpf_kwork_top.c b/tools/perf/util/bpf_kwork_top.c
index 42897ea22c61..3998bd2a938f 100644
--- a/tools/perf/util/bpf_kwork_top.c
+++ b/tools/perf/util/bpf_kwork_top.c
@@ -79,6 +79,16 @@ void perf_kwork__top_finish(void)
pr_debug("perf kwork top finish at: %lld\n", skel->bss->to_timestamp);
}
+static void irq_load_prepare(void)
+{
+ bpf_program__set_autoload(skel->progs.on_irq_handler_entry, true);
+ bpf_program__set_autoload(skel->progs.on_irq_handler_exit, true);
+}
+
+static struct kwork_class_bpf kwork_irq_bpf = {
+ .load_prepare = irq_load_prepare,
+};
+
static void sched_load_prepare(void)
{
bpf_program__set_autoload(skel->progs.on_switch, true);
@@ -90,6 +100,7 @@ static struct kwork_class_bpf kwork_sched_bpf = {
static struct kwork_class_bpf *
kwork_class_bpf_supported_list[KWORK_CLASS_MAX] = {
+ [KWORK_CLASS_IRQ] = &kwork_irq_bpf,
[KWORK_CLASS_SCHED] = &kwork_sched_bpf,
};
diff --git a/tools/perf/util/bpf_skel/kwork_top.bpf.c b/tools/perf/util/bpf_skel/kwork_top.bpf.c
index 47ad61608ec7..9c7dc62386c7 100644
--- a/tools/perf/util/bpf_skel/kwork_top.bpf.c
+++ b/tools/perf/util/bpf_skel/kwork_top.bpf.c
@@ -54,6 +54,13 @@ struct {
__type(value, struct time_data);
} kwork_top_task_time SEC(".maps");
+struct {
+ __uint(type, BPF_MAP_TYPE_PERCPU_HASH);
+ __uint(key_size, sizeof(struct work_key));
+ __uint(value_size, sizeof(struct time_data));
+ __uint(max_entries, MAX_ENTRIES);
+} kwork_top_irq_time SEC(".maps");
+
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(key_size, sizeof(struct task_key));
@@ -184,4 +191,76 @@ int on_switch(u64 *ctx)
return 0;
}
+SEC("tp_btf/irq_handler_entry")
+int on_irq_handler_entry(u64 *cxt)
+{
+ struct task_struct *task;
+
+ if (!enabled)
+ return 0;
+
+ __u32 cpu = bpf_get_smp_processor_id();
+
+ if (cpu_is_filtered(cpu))
+ return 0;
+
+ __u64 ts = bpf_ktime_get_ns();
+
+ task = (struct task_struct *)bpf_get_current_task();
+ if (!task)
+ return 0;
+
+ struct work_key key = {
+ .type = KWORK_CLASS_IRQ,
+ .pid = BPF_CORE_READ(task, pid),
+ .task_p = (__u64)task,
+ };
+
+ struct time_data data = {
+ .timestamp = ts,
+ };
+
+ bpf_map_update_elem(&kwork_top_irq_time, &key, &data, BPF_ANY);
+
+ return 0;
+}
+
+SEC("tp_btf/irq_handler_exit")
+int on_irq_handler_exit(u64 *cxt)
+{
+ __u64 delta;
+ struct task_struct *task;
+ struct time_data *pelem;
+
+ if (!enabled)
+ return 0;
+
+ __u32 cpu = bpf_get_smp_processor_id();
+
+ if (cpu_is_filtered(cpu))
+ return 0;
+
+ __u64 ts = bpf_ktime_get_ns();
+
+ task = (struct task_struct *)bpf_get_current_task();
+ if (!task)
+ return 0;
+
+ struct work_key key = {
+ .type = KWORK_CLASS_IRQ,
+ .pid = BPF_CORE_READ(task, pid),
+ .task_p = (__u64)task,
+ };
+
+ pelem = bpf_map_lookup_elem(&kwork_top_irq_time, &key);
+ if (pelem && pelem->timestamp != 0)
+ delta = ts - pelem->timestamp;
+ else
+ delta = ts - from_timestamp;
+
+ update_work(&key, delta);
+
+ return 0;
+}
+
char LICENSE[] SEC("license") = "Dual BSD/GPL";
--
2.30.GIT
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