1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2023. Huawei Technologies Co., Ltd */
5 #include <linux/types.h>
7 #include <bpf/bpf_helpers.h>
8 #include <bpf/bpf_tracing.h>
18 __uint(type, BPF_MAP_TYPE_HASH);
20 __uint(map_flags, BPF_F_NO_PREALLOC);
23 char _license[] SEC("license") = "GPL";
25 unsigned char zeroed_value[4096];
26 unsigned int nr_thread = 0;
29 static int write_htab(unsigned int i, struct update_ctx *ctx, unsigned int flags)
31 bpf_map_update_elem(&htab, &ctx->from, zeroed_value, flags);
32 ctx->from += ctx->step;
37 static int overwrite_htab(unsigned int i, struct update_ctx *ctx)
39 return write_htab(i, ctx, 0);
42 static int newwrite_htab(unsigned int i, struct update_ctx *ctx)
44 return write_htab(i, ctx, BPF_NOEXIST);
47 static int del_htab(unsigned int i, struct update_ctx *ctx)
49 bpf_map_delete_elem(&htab, &ctx->from);
50 ctx->from += ctx->step;
55 SEC("?tp/syscalls/sys_enter_getpgid")
56 int overwrite(void *ctx)
58 struct update_ctx update;
60 update.from = bpf_get_smp_processor_id();
61 update.step = nr_thread;
62 bpf_loop(OP_BATCH, overwrite_htab, &update, 0);
63 __sync_fetch_and_add(&op_cnt, 1);
67 SEC("?tp/syscalls/sys_enter_getpgid")
68 int batch_add_batch_del(void *ctx)
70 struct update_ctx update;
72 update.from = bpf_get_smp_processor_id();
73 update.step = nr_thread;
74 bpf_loop(OP_BATCH, overwrite_htab, &update, 0);
76 update.from = bpf_get_smp_processor_id();
77 bpf_loop(OP_BATCH, del_htab, &update, 0);
79 __sync_fetch_and_add(&op_cnt, 2);
83 SEC("?tp/syscalls/sys_enter_getpgid")
84 int add_only(void *ctx)
86 struct update_ctx update;
88 update.from = bpf_get_smp_processor_id() / 2;
89 update.step = nr_thread / 2;
90 bpf_loop(OP_BATCH, newwrite_htab, &update, 0);
91 __sync_fetch_and_add(&op_cnt, 1);
95 SEC("?tp/syscalls/sys_enter_getppid")
96 int del_only(void *ctx)
98 struct update_ctx update;
100 update.from = bpf_get_smp_processor_id() / 2;
101 update.step = nr_thread / 2;
102 bpf_loop(OP_BATCH, del_htab, &update, 0);
103 __sync_fetch_and_add(&op_cnt, 1);