Messages in this thread |  | | Date | Fri, 17 Aug 2001 09:26:10 -0500 | From | Dave McCracken <> | Subject | Re: [PATCH] processes with shared vm |
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--On Friday, August 17, 2001 10:46:59 +0200 Terje Eggestad <terje.eggestad@scali.no> wrote:
> hought of all that, yes ps will have O(n^2) BUT ONLY FOR CLONED PROCS. > How many cloned procs do you usually have???? > > Even if I agree that there should be a linked list of all the cloned > procs, it means major changes to the data structs in the kernel. > > With the number of threaded programs out there, this is "good enough".
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.
Dave McCracken
====================================================================== Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059 dmccr@us.ibm.com T/L 678-3059
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