hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
24 lines
499 B
C
24 lines
499 B
C
#include <uapi/linux/ptrace.h>
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#include <linux/sched.h>
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struct key_t {
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u32 prev_pid;
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u32 curr_pid;
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};
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BPF_HASH(stats, struct key_t, u64, 1024);
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int count_sched(struct pt_regs *ctx, struct task_struct *prev) {
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struct key_t key = {};
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u64 zero = 0, *val;
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key.curr_pid = bpf_get_current_pid_tgid();
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key.prev_pid = prev->pid;
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// could also use `stats.increment(key);`
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val = stats.lookup_or_try_init(&key, &zero);
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if (val) {
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(*val)++;
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}
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return 0;
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}
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