Re: overcommit stuff

[Andrew Morton <akpm@digeo.com>]

William Lee Irwin III wrote:
> 
> On Sun, Sep 22, 2002 at 12:46:59AM +0100, Hugh Dickins wrote:
> > I don't think Alan can be held responsible for errors in the
> > overcommit stuff rml ported to 2.5 and I then added fixes to.
> > I believe it is up to date in 2.5.
> > Committed_AS certainly errs on the pessimistic side, that's
> > what it's about.  How much swap do you have i.e. is 23GB
> > committed impossible, or just surprising to you?  Does the
> > number go back to what it started off from when you kill
> > off the tests?  How are "those pages" allocated e.g. what
> > mmap args?
> > Hugh
> 
> In my case it's not really possible to rerun a test in the same
> boot. It's not really survived very often, and when it has, it
> generally fails to start a second time. Various other things feel the
> OOM sting then, e.g. kernel compiles, small task count dbench, etc.
> 
> Some of this might be slab, but I think there might be a leak.
> The best answers I've come up with thus far are "Hrm, the OOM killer
> gets set off at the wrong times, and maybe delalloc would kill bh's?"
> 

I see no leak.  After a 30-40 minute run I managed to wrestle all
the threads to the ground, unmounted the target fs and ended
up with


             total       used       free     shared    buffers     cached
Mem:       7249612      62796    7186816          0      11016      10804
-/+ buffers/cache:      40976    7208636
Swap:      3951844         80    3951764
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