Hi
But I can't modify the task_struct , in another word , I can't change
the kernel.
What I can do is just using a module.
I am afraid you can't do that via module. In fact you must be careful on
where to insert that new tag, because some properties in task_struct are
accessed via offset, so if you change the order, it is likely made
another codes broken. Conclusion: do it by directly patching the kernel,
or use another way to tag the task. I think creating a linked list
containing the PIDs could be a favorable choice.
regards,
Mulyadi
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