Use BPF to collect statistics on the CPU usage based on perf BPF skeletons.
Example usage:
# perf kwork top -h
Usage: perf kwork top [<options>]
-b, --use-bpf Use BPF to measure task cpu usage
-C, --cpu <cpu> list of cpus to profile
-i, --input <file> input file name
-n, --name <name> event name to profile
-s, --sort <key[,key2...]>
sort by key(s): rate, runtime, tid
--time <str> Time span for analysis (start,stop)
#
# perf kwork -k sched top -b
Starting trace, Hit <Ctrl+C> to stop and report
^C
Total : 160702.425 ms, 8 cpus
%Cpu(s): 36.00% id, 0.00% hi, 0.00% si
%Cpu0 [|||||||||||||||||| 61.66%]
%Cpu1 [|||||||||||||||||| 61.27%]
%Cpu2 [||||||||||||||||||| 66.40%]
%Cpu3 [|||||||||||||||||| 61.28%]
%Cpu4 [|||||||||||||||||| 61.82%]
%Cpu5 [||||||||||||||||||||||| 77.41%]
%Cpu6 [|||||||||||||||||| 61.73%]
%Cpu7 [|||||||||||||||||| 63.25%]
PID SPID %CPU RUNTIME COMMMAND
-------------------------------------------------------------
0 0 38.72 8089.463 ms [swapper/1]
0 0 38.71 8084.547 ms [swapper/3]
0 0 38.33 8007.532 ms [swapper/0]
0 0 38.26 7992.985 ms [swapper/6]
0 0 38.17 7971.865 ms [swapper/4]
0 0 36.74 7447.765 ms [swapper/7]
0 0 33.59 6486.942 ms [swapper/2]
0 0 22.58 3771.268 ms [swapper/5]
9545 9351 2.48 447.136 ms sched-messaging
9574 9351 2.09 418.583 ms sched-messaging
9724 9351 2.05 372.407 ms sched-messaging
9531 9351 2.01 368.804 ms sched-messaging
9512 9351 2.00 362.250 ms sched-messaging
9514 9351 1.95 357.767 ms sched-messaging
9538 9351 1.86 384.476 ms sched-messaging
9712 9351 1.84 386.490 ms sched-messaging
9723 9351 1.83 380.021 ms sched-messaging
9722 9351 1.82 382.738 ms sched-messaging
9517 9351 1.81 354.794 ms sched-messaging
9559 9351 1.79 344.305 ms sched-messaging
9725 9351 1.77 365.315 ms sched-messaging
<SNIP>
# perf kwork -k sched top -b -n perf
Starting trace, Hit <Ctrl+C> to stop and report
^C
Total : 151563.332 ms, 8 cpus
%Cpu(s): 26.49% id, 0.00% hi, 0.00% si
%Cpu0 [ 0.01%]
%Cpu1 [ 0.00%]
%Cpu2 [ 0.00%]
%Cpu3 [ 0.00%]
%Cpu4 [ 0.00%]
%Cpu5 [ 0.00%]
%Cpu6 [ 0.00%]
%Cpu7 [ 0.00%]
PID SPID %CPU RUNTIME COMMMAND
-------------------------------------------------------------
9754 9754 0.01 2.303 ms perf
#
# perf kwork -k sched top -b -C 2,3,4
Starting trace, Hit <Ctrl+C> to stop and report
^C
Total : 48016.721 ms, 3 cpus
%Cpu(s): 27.82% id, 0.00% hi, 0.00% si
%Cpu2 [|||||||||||||||||||||| 74.68%]
%Cpu3 [||||||||||||||||||||| 71.06%]
%Cpu4 [||||||||||||||||||||| 70.91%]
PID SPID %CPU RUNTIME COMMMAND
-------------------------------------------------------------
0 0 29.08 4734.998 ms [swapper/4]
0 0 28.93 4710.029 ms [swapper/3]
0 0 25.31 3912.363 ms [swapper/2]
10248 10158 1.62 264.931 ms sched-messaging
10253 10158 1.62 265.136 ms sched-messaging
10158 10158 1.60 263.013 ms bash
10360 10158 1.49 243.639 ms sched-messaging
10413 10158 1.48 238.604 ms sched-messaging
10531 10158 1.47 234.067 ms sched-messaging
10400 10158 1.47 240.631 ms sched-messaging
10355 10158 1.47 230.586 ms sched-messaging
10377 10158 1.43 234.835 ms sched-messaging
10526 10158 1.42 232.045 ms sched-messaging
10298 10158 1.41 222.396 ms sched-messaging
10410 10158 1.38 221.853 ms sched-messaging
10364 10158 1.38 226.042 ms sched-messaging
10480 10158 1.36 213.633 ms sched-messaging
10370 10158 1.36 223.620 ms sched-messaging
10553 10158 1.34 217.169 ms sched-messaging
10291 10158 1.34 211.516 ms sched-messaging
10251 10158 1.34 218.813 ms sched-messaging
10522 10158 1.33 218.498 ms sched-messaging
10288 10158 1.33 216.787 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/20230812084917.169338-15-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
perf kwork latency -b
perf kwork timehist
perf kwork top
+ perf kwork top -b
By default it shows the individual work events such as irq, workqeueu,
including the run time and delay (time between raise and actually entry):
OPTIONS for 'perf kwork top'
---------------------------------
+-b::
+--use-bpf::
+ Use BPF to measure task cpu usage.
+
-C::
--cpu::
Only show events for the given CPU(s) (comma separated list).
SKELETONS += $(SKEL_OUT)/bperf_cgroup.skel.h $(SKEL_OUT)/func_latency.skel.h
SKELETONS += $(SKEL_OUT)/off_cpu.skel.h $(SKEL_OUT)/lock_contention.skel.h
SKELETONS += $(SKEL_OUT)/kwork_trace.skel.h $(SKEL_OUT)/sample_filter.skel.h
+SKELETONS += $(SKEL_OUT)/kwork_top.skel.h
SKELETONS += $(SKEL_OUT)/bench_uprobe.skel.h
SKELETONS += $(SKEL_OUT)/augmented_raw_syscalls.skel.h
int ret;
printf("\n ");
- ret = printf(" %*s %*s %*s %-*s",
+ ret = printf(" %*s %s%*s%s %*s %*s %-*s",
PRINT_PID_WIDTH, "PID",
+
+ kwork->use_bpf ? " " : "",
+ kwork->use_bpf ? PRINT_PID_WIDTH : 0,
+ kwork->use_bpf ? "SPID" : "",
+ kwork->use_bpf ? " " : "",
+
PRINT_CPU_USAGE_WIDTH, "%CPU",
PRINT_RUNTIME_HEADER_WIDTH + RPINT_DECIMAL_WIDTH, "RUNTIME",
PRINT_TASK_NAME_WIDTH, "COMMMAND");
*/
ret += printf(" %*ld ", PRINT_PID_WIDTH, work->id);
+ /*
+ * tgid
+ */
+ if (kwork->use_bpf)
+ ret += printf(" %*d ", PRINT_PID_WIDTH, work->tgid);
+
/*
* cpu usage
*/
/*
* command
*/
- ret += printf(" %-*s", PRINT_TASK_NAME_WIDTH, work->name);
+ if (kwork->use_bpf)
+ ret += printf(" %s%s%s",
+ work->is_kthread ? "[" : "",
+ work->name,
+ work->is_kthread ? "]" : "");
+ else
+ ret += printf(" %-*s", PRINT_TASK_NAME_WIDTH, work->name);
printf("\n");
return ret;
printf("\n");
}
+static int perf_kwork__top_bpf(struct perf_kwork *kwork)
+{
+ int ret;
+
+ signal(SIGINT, sig_handler);
+ signal(SIGTERM, sig_handler);
+
+ ret = perf_kwork__top_prepare_bpf(kwork);
+ if (ret)
+ return -1;
+
+ printf("Starting trace, Hit <Ctrl+C> to stop and report\n");
+
+ perf_kwork__top_start();
+
+ /*
+ * a simple pause, wait here for stop signal
+ */
+ pause();
+
+ perf_kwork__top_finish();
+
+ perf_kwork__top_read_bpf(kwork);
+
+ perf_kwork__top_cleanup_bpf();
+
+ return 0;
+
+}
+
static int perf_kwork__top(struct perf_kwork *kwork)
{
struct __top_cpus_runtime *cpus_runtime;
kwork->top_stat.cpus_runtime = cpus_runtime;
bitmap_zero(kwork->top_stat.all_cpus_bitmap, MAX_NR_CPUS);
- ret = perf_kwork__read_events(kwork);
+ if (kwork->use_bpf)
+ ret = perf_kwork__top_bpf(kwork);
+ else
+ ret = perf_kwork__read_events(kwork);
+
if (ret)
goto out;
"Time span for analysis (start,stop)"),
OPT_STRING('i', "input", &input_name, "file",
"input file name"),
+#ifdef HAVE_BPF_SKEL
+ OPT_BOOLEAN('b', "use-bpf", &kwork.use_bpf,
+ "Use BPF to measure task cpu usage"),
+#endif
OPT_PARENT(kwork_options)
};
const char *kwork_usage[] = {
ifeq ($(CONFIG_LIBTRACEEVENT),y)
perf-$(CONFIG_PERF_BPF_SKEL) += bpf_kwork.o
+ perf-$(CONFIG_PERF_BPF_SKEL) += bpf_kwork_top.o
endif
perf-$(CONFIG_LIBELF) += symbol-elf.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * bpf_kwork_top.c
+ *
+ * Copyright (c) 2022 Huawei Inc, Yang Jihong <yangjihong1@huawei.com>
+ */
+
+#include <time.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <linux/time64.h>
+
+#include "util/debug.h"
+#include "util/evsel.h"
+#include "util/kwork.h"
+
+#include <bpf/bpf.h>
+#include <perf/cpumap.h>
+
+#include "util/bpf_skel/kwork_top.skel.h"
+
+/*
+ * This should be in sync with "util/kwork_top.bpf.c"
+ */
+#define MAX_COMMAND_LEN 16
+
+struct time_data {
+ __u64 timestamp;
+};
+
+struct work_data {
+ __u64 runtime;
+};
+
+struct task_data {
+ __u32 tgid;
+ __u32 is_kthread;
+ char comm[MAX_COMMAND_LEN];
+};
+
+struct work_key {
+ __u32 type;
+ __u32 pid;
+ __u64 task_p;
+};
+
+struct task_key {
+ __u32 pid;
+ __u32 cpu;
+};
+
+struct kwork_class_bpf {
+ struct kwork_class *class;
+ void (*load_prepare)(void);
+};
+
+static struct kwork_top_bpf *skel;
+
+void perf_kwork__top_start(void)
+{
+ struct timespec ts;
+
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ skel->bss->from_timestamp = (u64)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
+ skel->bss->enabled = 1;
+ pr_debug("perf kwork top start at: %lld\n", skel->bss->from_timestamp);
+}
+
+void perf_kwork__top_finish(void)
+{
+ struct timespec ts;
+
+ skel->bss->enabled = 0;
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ skel->bss->to_timestamp = (u64)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
+ pr_debug("perf kwork top finish at: %lld\n", skel->bss->to_timestamp);
+}
+
+static void sched_load_prepare(void)
+{
+ bpf_program__set_autoload(skel->progs.on_switch, true);
+}
+
+static struct kwork_class_bpf kwork_sched_bpf = {
+ .load_prepare = sched_load_prepare,
+};
+
+static struct kwork_class_bpf *
+kwork_class_bpf_supported_list[KWORK_CLASS_MAX] = {
+ [KWORK_CLASS_SCHED] = &kwork_sched_bpf,
+};
+
+static bool valid_kwork_class_type(enum kwork_class_type type)
+{
+ return type >= 0 && type < KWORK_CLASS_MAX ? true : false;
+}
+
+static int setup_filters(struct perf_kwork *kwork)
+{
+ u8 val = 1;
+ int i, nr_cpus, fd;
+ struct perf_cpu_map *map;
+
+ if (kwork->cpu_list) {
+ fd = bpf_map__fd(skel->maps.kwork_top_cpu_filter);
+ if (fd < 0) {
+ pr_debug("Invalid cpu filter fd\n");
+ return -1;
+ }
+
+ map = perf_cpu_map__new(kwork->cpu_list);
+ if (!map) {
+ pr_debug("Invalid cpu_list\n");
+ return -1;
+ }
+
+ nr_cpus = libbpf_num_possible_cpus();
+ for (i = 0; i < perf_cpu_map__nr(map); i++) {
+ struct perf_cpu cpu = perf_cpu_map__cpu(map, i);
+
+ if (cpu.cpu >= nr_cpus) {
+ perf_cpu_map__put(map);
+ pr_err("Requested cpu %d too large\n", cpu.cpu);
+ return -1;
+ }
+ bpf_map_update_elem(fd, &cpu.cpu, &val, BPF_ANY);
+ }
+ perf_cpu_map__put(map);
+
+ skel->bss->has_cpu_filter = 1;
+ }
+
+ return 0;
+}
+
+int perf_kwork__top_prepare_bpf(struct perf_kwork *kwork __maybe_unused)
+{
+ struct bpf_program *prog;
+ struct kwork_class *class;
+ struct kwork_class_bpf *class_bpf;
+ enum kwork_class_type type;
+
+ skel = kwork_top_bpf__open();
+ if (!skel) {
+ pr_debug("Failed to open kwork top skeleton\n");
+ return -1;
+ }
+
+ /*
+ * set all progs to non-autoload,
+ * then set corresponding progs according to config
+ */
+ bpf_object__for_each_program(prog, skel->obj)
+ bpf_program__set_autoload(prog, false);
+
+ list_for_each_entry(class, &kwork->class_list, list) {
+ type = class->type;
+ if (!valid_kwork_class_type(type) ||
+ !kwork_class_bpf_supported_list[type]) {
+ pr_err("Unsupported bpf trace class %s\n", class->name);
+ goto out;
+ }
+
+ class_bpf = kwork_class_bpf_supported_list[type];
+ class_bpf->class = class;
+
+ if (class_bpf->load_prepare)
+ class_bpf->load_prepare();
+ }
+
+ if (kwork_top_bpf__load(skel)) {
+ pr_debug("Failed to load kwork top skeleton\n");
+ goto out;
+ }
+
+ if (setup_filters(kwork))
+ goto out;
+
+ if (kwork_top_bpf__attach(skel)) {
+ pr_debug("Failed to attach kwork top skeleton\n");
+ goto out;
+ }
+
+ return 0;
+
+out:
+ kwork_top_bpf__destroy(skel);
+ return -1;
+}
+
+static void read_task_info(struct kwork_work *work)
+{
+ int fd;
+ struct task_data data;
+ struct task_key key = {
+ .pid = work->id,
+ .cpu = work->cpu,
+ };
+
+ fd = bpf_map__fd(skel->maps.kwork_top_tasks);
+ if (fd < 0) {
+ pr_debug("Invalid top tasks map fd\n");
+ return;
+ }
+
+ if (!bpf_map_lookup_elem(fd, &key, &data)) {
+ work->tgid = data.tgid;
+ work->is_kthread = data.is_kthread;
+ work->name = strdup(data.comm);
+ }
+}
+static int add_work(struct perf_kwork *kwork, struct work_key *key,
+ struct work_data *data, int cpu)
+{
+ struct kwork_class_bpf *bpf_trace;
+ struct kwork_work *work;
+ struct kwork_work tmp = {
+ .id = key->pid,
+ .cpu = cpu,
+ .name = NULL,
+ };
+ enum kwork_class_type type = key->type;
+
+ if (!valid_kwork_class_type(type)) {
+ pr_debug("Invalid class type %d to add work\n", type);
+ return -1;
+ }
+
+ bpf_trace = kwork_class_bpf_supported_list[type];
+ tmp.class = bpf_trace->class;
+
+ work = perf_kwork_add_work(kwork, tmp.class, &tmp);
+ if (!work)
+ return -1;
+
+ work->total_runtime = data->runtime;
+ read_task_info(work);
+
+ return 0;
+}
+
+int perf_kwork__top_read_bpf(struct perf_kwork *kwork)
+{
+ int i, fd, nr_cpus;
+ struct work_data *data;
+ struct work_key key, prev;
+
+ fd = bpf_map__fd(skel->maps.kwork_top_works);
+ if (fd < 0) {
+ pr_debug("Invalid top runtime fd\n");
+ return -1;
+ }
+
+ nr_cpus = libbpf_num_possible_cpus();
+ data = calloc(nr_cpus, sizeof(struct work_data));
+ if (!data)
+ return -1;
+
+ memset(&prev, 0, sizeof(prev));
+ while (!bpf_map_get_next_key(fd, &prev, &key)) {
+ if ((bpf_map_lookup_elem(fd, &key, data)) != 0) {
+ pr_debug("Failed to lookup top elem\n");
+ return -1;
+ }
+
+ for (i = 0; i < nr_cpus; i++) {
+ if (data[i].runtime == 0)
+ continue;
+
+ if (add_work(kwork, &key, &data[i], i))
+ return -1;
+ }
+ prev = key;
+ }
+ free(data);
+
+ return 0;
+}
+
+void perf_kwork__top_cleanup_bpf(void)
+{
+ kwork_top_bpf__destroy(skel);
+}
--- /dev/null
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+// Copyright (c) 2022, Huawei
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_core_read.h>
+
+/*
+ * This should be in sync with "util/kwork.h"
+ */
+enum kwork_class_type {
+ KWORK_CLASS_IRQ,
+ KWORK_CLASS_SOFTIRQ,
+ KWORK_CLASS_WORKQUEUE,
+ KWORK_CLASS_SCHED,
+ KWORK_CLASS_MAX,
+};
+
+#define MAX_ENTRIES 102400
+#define MAX_NR_CPUS 2048
+#define PF_KTHREAD 0x00200000
+#define MAX_COMMAND_LEN 16
+
+struct time_data {
+ __u64 timestamp;
+};
+
+struct work_data {
+ __u64 runtime;
+};
+
+struct task_data {
+ __u32 tgid;
+ __u32 is_kthread;
+ char comm[MAX_COMMAND_LEN];
+};
+
+struct work_key {
+ __u32 type;
+ __u32 pid;
+ __u64 task_p;
+};
+
+struct task_key {
+ __u32 pid;
+ __u32 cpu;
+};
+
+struct {
+ __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
+ __uint(map_flags, BPF_F_NO_PREALLOC);
+ __type(key, int);
+ __type(value, struct time_data);
+} kwork_top_task_time SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(key_size, sizeof(struct task_key));
+ __uint(value_size, sizeof(struct task_data));
+ __uint(max_entries, MAX_ENTRIES);
+} kwork_top_tasks SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_PERCPU_HASH);
+ __uint(key_size, sizeof(struct work_key));
+ __uint(value_size, sizeof(struct work_data));
+ __uint(max_entries, MAX_ENTRIES);
+} kwork_top_works SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(key_size, sizeof(u32));
+ __uint(value_size, sizeof(u8));
+ __uint(max_entries, MAX_NR_CPUS);
+} kwork_top_cpu_filter SEC(".maps");
+
+int enabled = 0;
+
+int has_cpu_filter = 0;
+
+__u64 from_timestamp = 0;
+__u64 to_timestamp = 0;
+
+static __always_inline int cpu_is_filtered(__u32 cpu)
+{
+ __u8 *cpu_val;
+
+ if (has_cpu_filter) {
+ cpu_val = bpf_map_lookup_elem(&kwork_top_cpu_filter, &cpu);
+ if (!cpu_val)
+ return 1;
+ }
+
+ return 0;
+}
+
+static __always_inline void update_task_info(struct task_struct *task, __u32 cpu)
+{
+ struct task_key key = {
+ .pid = task->pid,
+ .cpu = cpu,
+ };
+
+ if (!bpf_map_lookup_elem(&kwork_top_tasks, &key)) {
+ struct task_data data = {
+ .tgid = task->tgid,
+ .is_kthread = task->flags & PF_KTHREAD ? 1 : 0,
+ };
+ BPF_CORE_READ_STR_INTO(&data.comm, task, comm);
+
+ bpf_map_update_elem(&kwork_top_tasks, &key, &data, BPF_ANY);
+ }
+}
+
+static __always_inline void update_work(struct work_key *key, __u64 delta)
+{
+ struct work_data *data;
+
+ data = bpf_map_lookup_elem(&kwork_top_works, key);
+ if (data) {
+ data->runtime += delta;
+ } else {
+ struct work_data new_data = {
+ .runtime = delta,
+ };
+
+ bpf_map_update_elem(&kwork_top_works, key, &new_data, BPF_ANY);
+ }
+}
+
+static void on_sched_out(struct task_struct *task, __u64 ts, __u32 cpu)
+{
+ __u64 delta;
+ struct time_data *pelem;
+
+ pelem = bpf_task_storage_get(&kwork_top_task_time, task, NULL, 0);
+ if (pelem)
+ delta = ts - pelem->timestamp;
+ else
+ delta = ts - from_timestamp;
+
+ struct work_key key = {
+ .type = KWORK_CLASS_SCHED,
+ .pid = task->pid,
+ .task_p = (__u64)task,
+ };
+
+ update_work(&key, delta);
+ update_task_info(task, cpu);
+}
+
+static void on_sched_in(struct task_struct *task, __u64 ts)
+{
+ struct time_data *pelem;
+
+ pelem = bpf_task_storage_get(&kwork_top_task_time, task, NULL,
+ BPF_LOCAL_STORAGE_GET_F_CREATE);
+ if (pelem)
+ pelem->timestamp = ts;
+}
+
+SEC("tp_btf/sched_switch")
+int on_switch(u64 *ctx)
+{
+ struct task_struct *prev, *next;
+
+ prev = (struct task_struct *)ctx[1];
+ next = (struct task_struct *)ctx[2];
+
+ if (!enabled)
+ return 0;
+
+ __u32 cpu = bpf_get_smp_processor_id();
+
+ if (cpu_is_filtered(cpu))
+ return 0;
+
+ __u64 ts = bpf_ktime_get_ns();
+
+ on_sched_out(prev, ts, cpu);
+ on_sched_in(next, ts);
+
+ return 0;
+}
+
+char LICENSE[] SEC("license") = "Dual BSD/GPL";
* top report
*/
u32 cpu_usage;
+ u32 tgid;
+ bool is_kthread;
};
struct kwork_class {
void perf_kwork__trace_start(void);
void perf_kwork__trace_finish(void);
+int perf_kwork__top_prepare_bpf(struct perf_kwork *kwork);
+int perf_kwork__top_read_bpf(struct perf_kwork *kwork);
+void perf_kwork__top_cleanup_bpf(void);
+
+void perf_kwork__top_start(void);
+void perf_kwork__top_finish(void);
+
#else /* !HAVE_BPF_SKEL */
static inline int
static inline void perf_kwork__trace_start(void) {}
static inline void perf_kwork__trace_finish(void) {}
+static inline int
+perf_kwork__top_prepare_bpf(struct perf_kwork *kwork __maybe_unused)
+{
+ return -1;
+}
+
+static inline int
+perf_kwork__top_read_bpf(struct perf_kwork *kwork __maybe_unused)
+{
+ return -1;
+}
+
+static inline void perf_kwork__top_cleanup_bpf(void) {}
+
+static inline void perf_kwork__top_start(void) {}
+static inline void perf_kwork__top_finish(void) {}
+
#endif /* HAVE_BPF_SKEL */
#endif /* PERF_UTIL_KWORK_H */
projects / linux-block.git / commitdiff