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uprobe-stress: add uprobe stress-testing tool #279

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3 changes: 3 additions & 0 deletions examples/c/.gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -14,3 +14,6 @@
/lsm
/cmake-build-debug/
/cmake-build-release/
/uprobe-stress
.gdb_history

3 changes: 2 additions & 1 deletion examples/c/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,8 @@ INCLUDES := -I$(OUTPUT) -I../../libbpf/include/uapi -I$(dir $(VMLINUX)) -I$(LIBB
CFLAGS := -g -Wall
ALL_LDFLAGS := $(LDFLAGS) $(EXTRA_LDFLAGS)

APPS = minimal minimal_legacy bootstrap uprobe kprobe fentry usdt sockfilter tc ksyscall task_iter lsm
APPS = minimal minimal_legacy bootstrap uprobe kprobe fentry usdt sockfilter tc ksyscall task_iter lsm \
uprobe-stress

CARGO ?= $(shell which cargo)
ifeq ($(strip $(CARGO)),)
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30 changes: 30 additions & 0 deletions examples/c/uprobe-stress.bpf.c
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Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "uprobe-stress.h"

char LICENSE[] SEC("license") = "Dual BSD/GPL";

struct counter enter_hits[MAX_CPUS];
struct counter exit_hits[MAX_CPUS];

SEC("uprobe.multi")
int uprobe(struct pt_regs *ctx)
{
int cpu = bpf_get_smp_processor_id();

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

return 0;
}

SEC("uretprobe.multi")
int uretprobe(struct pt_regs *ctx)
{
int cpu = bpf_get_smp_processor_id();

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

return 0;
}
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