106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (C) 2023. Huawei Technologies Co., Ltd */
|
|
#include <stdbool.h>
|
|
#include <errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
|
|
#define OP_BATCH 64
|
|
|
|
struct update_ctx {
|
|
unsigned int from;
|
|
unsigned int step;
|
|
};
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_HASH);
|
|
__uint(key_size, 4);
|
|
__uint(map_flags, BPF_F_NO_PREALLOC);
|
|
} htab SEC(".maps");
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
|
|
unsigned char zeroed_value[4096];
|
|
unsigned int nr_thread = 0;
|
|
long op_cnt = 0;
|
|
|
|
static int write_htab(unsigned int i, struct update_ctx *ctx, unsigned int flags)
|
|
{
|
|
bpf_map_update_elem(&htab, &ctx->from, zeroed_value, flags);
|
|
ctx->from += ctx->step;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int overwrite_htab(unsigned int i, struct update_ctx *ctx)
|
|
{
|
|
return write_htab(i, ctx, 0);
|
|
}
|
|
|
|
static int newwrite_htab(unsigned int i, struct update_ctx *ctx)
|
|
{
|
|
return write_htab(i, ctx, BPF_NOEXIST);
|
|
}
|
|
|
|
static int del_htab(unsigned int i, struct update_ctx *ctx)
|
|
{
|
|
bpf_map_delete_elem(&htab, &ctx->from);
|
|
ctx->from += ctx->step;
|
|
|
|
return 0;
|
|
}
|
|
|
|
SEC("?tp/syscalls/sys_enter_getpgid")
|
|
int overwrite(void *ctx)
|
|
{
|
|
struct update_ctx update;
|
|
|
|
update.from = bpf_get_smp_processor_id();
|
|
update.step = nr_thread;
|
|
bpf_loop(OP_BATCH, overwrite_htab, &update, 0);
|
|
__sync_fetch_and_add(&op_cnt, 1);
|
|
return 0;
|
|
}
|
|
|
|
SEC("?tp/syscalls/sys_enter_getpgid")
|
|
int batch_add_batch_del(void *ctx)
|
|
{
|
|
struct update_ctx update;
|
|
|
|
update.from = bpf_get_smp_processor_id();
|
|
update.step = nr_thread;
|
|
bpf_loop(OP_BATCH, overwrite_htab, &update, 0);
|
|
|
|
update.from = bpf_get_smp_processor_id();
|
|
bpf_loop(OP_BATCH, del_htab, &update, 0);
|
|
|
|
__sync_fetch_and_add(&op_cnt, 2);
|
|
return 0;
|
|
}
|
|
|
|
SEC("?tp/syscalls/sys_enter_getpgid")
|
|
int add_only(void *ctx)
|
|
{
|
|
struct update_ctx update;
|
|
|
|
update.from = bpf_get_smp_processor_id() / 2;
|
|
update.step = nr_thread / 2;
|
|
bpf_loop(OP_BATCH, newwrite_htab, &update, 0);
|
|
__sync_fetch_and_add(&op_cnt, 1);
|
|
return 0;
|
|
}
|
|
|
|
SEC("?tp/syscalls/sys_enter_getppid")
|
|
int del_only(void *ctx)
|
|
{
|
|
struct update_ctx update;
|
|
|
|
update.from = bpf_get_smp_processor_id() / 2;
|
|
update.step = nr_thread / 2;
|
|
bpf_loop(OP_BATCH, del_htab, &update, 0);
|
|
__sync_fetch_and_add(&op_cnt, 1);
|
|
return 0;
|
|
}
|