perf kwork top: Add BPF-based statistics on softirq event support
Use BPF to collect statistics on softirq events based on perf BPF skeletons.
Example usage:
# perf kwork top -b
Starting trace, Hit <Ctrl+C> to stop and report
^C
Total : 135445.704 ms, 8 cpus
%Cpu(s): 28.35% id, 0.00% hi, 0.25% si
%Cpu0 [|||||||||||||||||||| 69.85%]
%Cpu1 [|||||||||||||||||||||| 74.10%]
%Cpu2 [||||||||||||||||||||| 71.18%]
%Cpu3 [|||||||||||||||||||| 69.61%]
%Cpu4 [|||||||||||||||||||||| 74.05%]
%Cpu5 [|||||||||||||||||||| 69.33%]
%Cpu6 [|||||||||||||||||||| 69.71%]
%Cpu7 [|||||||||||||||||||||| 73.77%]
PID SPID %CPU RUNTIME COMMMAND
-------------------------------------------------------------
0 0 30.43 5271.005 ms [swapper/5]
0 0 30.17 5226.644 ms [swapper/3]
0 0 30.08 5210.257 ms [swapper/6]
0 0 29.89 5177.177 ms [swapper/0]
0 0 28.51 4938.672 ms [swapper/2]
0 0 25.93 4223.464 ms [swapper/7]
0 0 25.69 4181.411 ms [swapper/4]
0 0 25.63 4173.804 ms [swapper/1]
16665 16265 2.16 360.600 ms sched-messaging
16537 16265 2.05 356.275 ms sched-messaging
16503 16265 2.01 343.063 ms sched-messaging
16424 16265 1.97 336.876 ms sched-messaging
16580 16265 1.94 323.658 ms sched-messaging
16515 16265 1.92 321.616 ms sched-messaging
16659 16265 1.91 325.538 ms sched-messaging
16634 16265 1.88 327.766 ms sched-messaging
16454 16265 1.87 326.843 ms sched-messaging
16382 16265 1.87 322.591 ms sched-messaging
16642 16265 1.86 320.506 ms sched-messaging
16582 16265 1.86 320.164 ms sched-messaging
16315 16265 1.86 326.872 ms sched-messaging
16637 16265 1.85 323.766 ms sched-messaging
16506 16265 1.82 311.688 ms sched-messaging
16512 16265 1.81 304.643 ms sched-messaging
16560 16265 1.80 314.751 ms sched-messaging
16320 16265 1.80 313.405 ms sched-messaging
16442 16265 1.80 314.403 ms sched-messaging
16626 16265 1.78 295.380 ms sched-messaging
16600 16265 1.77 309.444 ms sched-messaging
16550 16265 1.76 301.161 ms sched-messaging
16525 16265 1.75 296.560 ms sched-messaging
16314 16265 1.75 298.338 ms sched-messaging
16595 16265 1.74 304.390 ms sched-messaging
16555 16265 1.74 287.564 ms sched-messaging
16520 16265 1.74 295.734 ms sched-messaging
16507 16265 1.73 293.956 ms sched-messaging
16593 16265 1.72 296.443 ms sched-messaging
16531 16265 1.72 299.950 ms sched-messaging
16281 16265 1.72 301.339 ms sched-messaging
<SNIP>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Link: https://lore.kernel.org/r/20230812084917.169338-17-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Yang Jihong
Arnaldo Carvalho de Melo
parent
d2956b3acf
commit
36019dff30
@ -89,6 +89,16 @@ static struct kwork_class_bpf kwork_irq_bpf = {
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.load_prepare = irq_load_prepare,
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};
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static void softirq_load_prepare(void)
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{
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bpf_program__set_autoload(skel->progs.on_softirq_entry, true);
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bpf_program__set_autoload(skel->progs.on_softirq_exit, true);
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}
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static struct kwork_class_bpf kwork_softirq_bpf = {
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.load_prepare = softirq_load_prepare,
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};
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static void sched_load_prepare(void)
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{
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bpf_program__set_autoload(skel->progs.on_switch, true);
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@ -101,6 +111,7 @@ static struct kwork_class_bpf kwork_sched_bpf = {
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static struct kwork_class_bpf *
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kwork_class_bpf_supported_list[KWORK_CLASS_MAX] = {
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[KWORK_CLASS_IRQ] = &kwork_irq_bpf,
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[KWORK_CLASS_SOFTIRQ] = &kwork_softirq_bpf,
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[KWORK_CLASS_SCHED] = &kwork_sched_bpf,
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};
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@ -263,4 +263,76 @@ int on_irq_handler_exit(u64 *cxt)
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return 0;
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}
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SEC("tp_btf/softirq_entry")
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int on_softirq_entry(u64 *cxt)
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{
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struct task_struct *task;
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if (!enabled)
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return 0;
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__u32 cpu = bpf_get_smp_processor_id();
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if (cpu_is_filtered(cpu))
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return 0;
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__u64 ts = bpf_ktime_get_ns();
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task = (struct task_struct *)bpf_get_current_task();
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if (!task)
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return 0;
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struct work_key key = {
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.type = KWORK_CLASS_SOFTIRQ,
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.pid = BPF_CORE_READ(task, pid),
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.task_p = (__u64)task,
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};
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struct time_data data = {
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.timestamp = ts,
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};
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bpf_map_update_elem(&kwork_top_irq_time, &key, &data, BPF_ANY);
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return 0;
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}
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SEC("tp_btf/softirq_exit")
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int on_softirq_exit(u64 *cxt)
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{
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__u64 delta;
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struct task_struct *task;
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struct time_data *pelem;
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if (!enabled)
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return 0;
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__u32 cpu = bpf_get_smp_processor_id();
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if (cpu_is_filtered(cpu))
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return 0;
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__u64 ts = bpf_ktime_get_ns();
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task = (struct task_struct *)bpf_get_current_task();
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if (!task)
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return 0;
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struct work_key key = {
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.type = KWORK_CLASS_SOFTIRQ,
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.pid = BPF_CORE_READ(task, pid),
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.task_p = (__u64)task,
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};
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pelem = bpf_map_lookup_elem(&kwork_top_irq_time, &key);
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if (pelem)
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delta = ts - pelem->timestamp;
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else
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delta = ts - from_timestamp;
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update_work(&key, delta);
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return 0;
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}
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char LICENSE[] SEC("license") = "Dual BSD/GPL";
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