124 lines
1.8 KiB
C
124 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <time.h>
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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struct timer {
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struct bpf_timer t;
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};
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struct lock {
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struct bpf_spin_lock l;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, struct timer);
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} timers SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, struct lock);
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} locks SEC(".maps");
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static int timer_cb(void *map, int *key, struct timer *timer)
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{
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return 0;
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}
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static void timer_work(void)
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{
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struct timer *timer;
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const int key = 0;
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timer = bpf_map_lookup_elem(&timers, &key);
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if (timer) {
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bpf_timer_init(&timer->t, &timers, CLOCK_MONOTONIC);
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bpf_timer_set_callback(&timer->t, timer_cb);
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bpf_timer_start(&timer->t, 10E9, 0);
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bpf_timer_cancel(&timer->t);
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}
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}
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static void spin_lock_work(void)
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{
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const int key = 0;
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struct lock *lock;
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lock = bpf_map_lookup_elem(&locks, &key);
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if (lock) {
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bpf_spin_lock(&lock->l);
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bpf_spin_unlock(&lock->l);
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}
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}
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SEC("?raw_tp/sys_enter")
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int raw_tp_timer(void *ctx)
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{
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timer_work();
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return 0;
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}
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SEC("?tp/syscalls/sys_enter_nanosleep")
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int tp_timer(void *ctx)
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{
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timer_work();
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return 0;
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}
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SEC("?kprobe")
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int kprobe_timer(void *ctx)
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{
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timer_work();
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return 0;
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}
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SEC("?perf_event")
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int perf_event_timer(void *ctx)
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{
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timer_work();
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return 0;
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}
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SEC("?raw_tp/sys_enter")
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int raw_tp_spin_lock(void *ctx)
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{
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spin_lock_work();
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return 0;
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}
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SEC("?tp/syscalls/sys_enter_nanosleep")
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int tp_spin_lock(void *ctx)
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{
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spin_lock_work();
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return 0;
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}
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SEC("?kprobe")
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int kprobe_spin_lock(void *ctx)
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{
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spin_lock_work();
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return 0;
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}
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SEC("?perf_event")
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int perf_event_spin_lock(void *ctx)
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{
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spin_lock_work();
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return 0;
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}
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const char LICENSE[] SEC("license") = "GPL";
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