Re: [PATCH] VM fix for 2.4.0-test9 & OOM handler

From: Andi Kleen (
Date: Mon Oct 09 2000 - 16:34:36 EST

On Mon, Oct 09, 2000 at 10:28:38PM +0100, Alan Cox wrote:
> > Sounds like one needs in addition some mechanism for servers to "charge" clients for
> > consumption. X certainly knows on behalf of which connection resources
> > are created; the OS could then transfer this back to the appropriate client
> > (at least when on machine).
> Definitely - and this is present in some non Unix OS's. We do pass credentials
> across AF_UNIX sockets so the mechanism is notionally there to provide the
> credentials to X, just not to use them

X can get the pid using SO_PEERCRED for unix connections.

When the oom killer maintains some kind of badness value in the task_struct
it would be possible to add a charge() systemcall that manipulates it.

int charge(pid_t pid, int memorytobecharged)

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