forked from ccfos/huatuo
44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
#include "vmlinux.h"
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#include <bpf/bpf_core_read.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_common.h"
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#include "bpf_ratelimit.h"
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char __license[] SEC("license") = "Dual MIT/GPL";
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#define CPU_NUM 128
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BPF_RATELIMIT_IN_MAP(rate, 1, CPU_NUM * 10000, 0);
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struct {
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__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
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__uint(key_size, sizeof(int));
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__uint(value_size, sizeof(u32));
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} softlockup_perf_events SEC(".maps");
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struct softlockup_info {
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u32 cpu;
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u32 pid;
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char comm[COMPAT_TASK_COMM_LEN];
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};
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SEC("kprobe/watchdog_timer_fn+442")
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int kprobe_watchdog_timer_fn(struct pt_regs *ctx)
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{
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struct softlockup_info info = {};
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struct task_struct *task;
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if (bpf_ratelimited_in_map(ctx, rate))
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return 0;
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info.cpu = bpf_get_smp_processor_id();
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task = (struct task_struct *)bpf_get_current_task();
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info.pid = bpf_get_current_pid_tgid() & 0xffffffffUL;
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BPF_CORE_READ_STR_INTO(&info.comm, task, comm);
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bpf_perf_event_output(ctx, &softlockup_perf_events,
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COMPAT_BPF_F_CURRENT_CPU, &info, sizeof(info));
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return 0;
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}
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