I am trying to create a distributed pid space.

0 to 2000 Computer 1
2001 to 4000 Computer 2
4001 to 6000 Computer 3

and so on...

I am running a master user-level process at Computer 1 which sends a
process context like code, data, registers, PC, etc as well as *"pid"* to
slave processes running at other computers. The responsibility of the slave
process is to fork a new process on order of master process and attach *"pid"
*given by the master to the new process it has forked. Any system call on
slave nodes will have an initial check of " Whether the process belongs to
local node or to the master node?". That is, if kernel at Computer 2 pid of
the process is 1500



On Mon, Mar 21, 2016 at 12:23 PM, [off-list ref] wrote:

On Mon, 21 Mar 2016 10:33:44 +0530, Nitin Varyani said:

quoted

Sub-task 1: Until now, parent process cannot control the pid of the

forked

quoted

child. A pid gets assigned as a sequential number by the kernel at the

time

quoted

the process is forked . I want to modify kernel in such a way that parent
process can control the pid of the forked child.

What does controlling the pid gain you?  To what purpose?

quoted

Sub-task 2: On Linux, you can find the maximum PID value for your system
with the following command:

$ cat /proc/sys/kernel/pid_max

Suppose pid_max=2000 for a system. I want that the parent process should

be

quoted

able to assign a pid which is greater that 2000 to the forked child.

Again, why would you want to do that?

Anyhow...

echo 3000 > /proc/sys/kernel/pid_max
fork a process that gets a pid over 2000.

Done.

Note that on 32 bit systems, using a pid_max of over 32768 will cause
various things in /proc to blow up.

I suspect that you need to think harder about what problem you're actually
trying to solve here - what will you do with a controlled child PID? Why
does
it even matter?

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