[Q] why switch_exec_pids() changes thread group leader pid?

[Kirill Korotaev]

Hello,

I've been looking through switch_exec_pids() function and found that it 
changes thread group leader PID/TGID. Is it really a good idea to change 
 pid of the process during it's lifetime? I could understand if it was 
happenning in the context of that process, but pid changes everytime a 
thread calls do_execve().

As far as I can see, leader doesn't have to do any of detach_pid()'s. 
Instead thread should change it's PID/TGID.

Am I wrong?

Kirill

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