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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
struct {
__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, int);
} task_storage SEC(".maps");
long hits;
long gp_hits;
long gp_times;
long current_gp_start;
long unexpected;
bool postgp_seen;
SEC("fentry/" SYS_PREFIX "sys_getpgid")
int get_local(void *ctx)
{
struct task_struct *task;
int idx;
int *s;
idx = 0;
task = bpf_get_current_task_btf();
s = bpf_task_storage_get(&task_storage, task, &idx,
BPF_LOCAL_STORAGE_GET_F_CREATE);
if (!s)
return 0;
*s = 3;
bpf_task_storage_delete(&task_storage, task);
__sync_add_and_fetch(&hits, 1);
return 0;
}
SEC("fentry/rcu_tasks_trace_pregp_step")
int pregp_step(struct pt_regs *ctx)
{
current_gp_start = bpf_ktime_get_ns();
return 0;
}
SEC("fentry/rcu_tasks_trace_postgp")
int postgp(struct pt_regs *ctx)
{
if (!current_gp_start && postgp_seen) {
/* Will only happen if prog tracing rcu_tasks_trace_pregp_step doesn't
* execute before this prog
*/
__sync_add_and_fetch(&unexpected, 1);
return 0;
}
__sync_add_and_fetch(&gp_times, bpf_ktime_get_ns() - current_gp_start);
__sync_add_and_fetch(&gp_hits, 1);
current_gp_start = 0;
postgp_seen = true;
return 0;
}
char _license[] SEC("license") = "GPL";
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