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get the pid namespace by following task_active_pid_ns() #3647

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merged 1 commit into from
Oct 20, 2021
Merged

get the pid namespace by following task_active_pid_ns() #3647

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20 changes: 19 additions & 1 deletion libbpf-tools/runqlat.bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,24 @@ int trace_enqueue(u32 tgid, u32 pid)
return 0;
}

static __always_inline unsigned int pid_namespace(struct task_struct *task)
{
struct pid *pid;
unsigned int level;
struct upid upid;
unsigned int inum;

/* get the pid namespace by following task_active_pid_ns(),
* pid->numbers[pid->level].ns
*/
pid = BPF_CORE_READ(task, thread_pid);
level = BPF_CORE_READ(pid, level);
bpf_core_read(&upid, sizeof(upid), &pid->numbers[level]);
inum = BPF_CORE_READ(upid.ns, ns.inum);

return inum;
}

SEC("tp_btf/sched_wakeup")
int BPF_PROG(sched_wakeup, struct task_struct *p)
{
Expand Down Expand Up @@ -86,7 +104,7 @@ int BPF_PROG(sched_swith, bool preempt, struct task_struct *prev,
else if (targ_per_thread)
hkey = pid;
else if (targ_per_pidns)
hkey = next->nsproxy->pid_ns_for_children->ns.inum;
hkey = pid_namespace(next);
else
hkey = -1;
histp = bpf_map_lookup_or_try_init(&hists, &hkey, &zero);
Expand Down