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    SubjectRe: Break 2.4 VM in five easy steps


    On Thu, 7 Jun 2001, Mike Galbraith wrote:

    > On 6 Jun 2001, Eric W. Biederman wrote:
    >
    > > Mike Galbraith <mikeg@wen-online.de> writes:
    > >
    > > > > If you could confirm this by calling swapoff sometime other than at
    > > > > reboot time. That might help. Say by running top on the console.
    > > >
    > > > The thing goes comatose here too. SCHED_RR vmstat doesn't run, console
    > > > switch is nogo...
    > > >
    > > > After running his memory hog, swapoff took 18 seconds. I hacked a
    > > > bleeder valve for dead swap pages, and it dropped to 4 seconds.. still
    > > > utterly comatose for those 4 seconds though.
    > >
    > > At the top of the while(1) loop in try_to_unuse what happens if you put in.
    > > if (need_resched) schedule();
    > > It should be outside all of the locks. It might just be a matter of everything
    > > serializing on the SMP locks, and the kernel refusing to preempt itself.
    >
    > That did it.

    What about including this workaround in the kernel ?

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