tools/testing/selftests/bpf/progs/trigger_bench.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/trigger_bench.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/trigger_bench.c
Extension
.c
Size
3210 bytes
Lines
191
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct counter {
	long value;
} __attribute__((aligned(128)));

struct counter hits[MAX_CPUS];

static __always_inline void inc_counter(void)
{
	int cpu = bpf_get_smp_processor_id();

	__sync_add_and_fetch(&hits[cpu & CPU_MASK].value, 1);
}

volatile const int stacktrace;

typedef __u64 stack_trace_t[128];

struct {
	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
	 __uint(max_entries, 1);
	__type(key, __u32);
	__type(value, stack_trace_t);
} stack_heap SEC(".maps");

static __always_inline void do_stacktrace(void *ctx)
{
	if (!stacktrace)
		return;

	__u64 *ptr = bpf_map_lookup_elem(&stack_heap, &(__u32){0});

	if (ptr)
		bpf_get_stack(ctx, ptr, sizeof(stack_trace_t), 0);
}

static __always_inline void handle(void *ctx)
{
	inc_counter();
	do_stacktrace(ctx);
}

SEC("?uprobe")
int bench_trigger_uprobe(void *ctx)
{
	inc_counter();
	return 0;
}

SEC("?uprobe.multi")
int bench_trigger_uprobe_multi(void *ctx)
{
	inc_counter();
	return 0;
}

const volatile int batch_iters = 0;

SEC("?raw_tp")
int trigger_kernel_count(void *ctx)
{
	int i;

	for (i = 0; i < batch_iters; i++) {
		inc_counter();
		bpf_get_numa_node_id();
	}

	return 0;
}

SEC("?raw_tp")
int trigger_driver(void *ctx)
{
	int i;

	for (i = 0; i < batch_iters; i++)
		(void)bpf_get_numa_node_id(); /* attach point for benchmarking */

	return 0;
}

extern int bpf_modify_return_test_tp(int nonce) __ksym __weak;

SEC("?raw_tp")
int trigger_driver_kfunc(void *ctx)
{
	int i;

	for (i = 0; i < batch_iters; i++)
		(void)bpf_modify_return_test_tp(0); /* attach point for benchmarking */

Annotation

Implementation Notes