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SubjectRe: [PATCH] processes with shared vm
On Fri, Aug 17, 2001 at 09:26:10AM -0500, Dave McCracken wrote:
> There is a simpler way to do this. All tasks belong to a thread group, and
> while thread groups are connected via a different clone flag
> (CLONE_THREAD), in practice CLONE_THREAD and CLONE_VM are generally used
> together. It would be trivial to add TGID to the information in /proc,
> then assume all tasks with the same TGID have the same VM as well. It
> would be just one more line in the /proc output and not require any
> additional overhead.

Even with a tgid you would need some way to avoid its counter wrapping
and getting reused. I think reusing the pid and pid hash for that is
cheaper. Also gtop should display correct results even with the programs
that don't use CLONE_THREAD.

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