Re: Break 2.4 VM in five easy steps

[Mike Galbraith <mikeg@wen-online.de>]

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.

	-Mike

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