sbrk(2) broken

Kostik Belousov kostikbel at gmail.com
Fri Jan 4 04:47:29 PST 2008


On Fri, Jan 04, 2008 at 08:51:32PM +1100, Peter Jeremy wrote:
> On Fri, Jan 04, 2008 at 08:27:41AM +0200, Ian FREISLICH wrote:
> >I have long lived processes that continuously handle very valuable
> >data and potentially get very large (several GB).  I'd like that
> >process to be able to make a rational decision about what happens to its
> >memory contents when an allocation fails rather than having the
> >proverbial rug pulled out from under it.  Rug pulling at any point 
> >can cost an annual salary or two.
> 
> If you google for freebsd+sigdanger, you will find that this topic
> was first discussed nearly 10 years ago.  Unfortunately, no progress
> appears to have been made, though it crops up every few years.

I need to make a slight correction there:

some time ago the patch at the
http://people.freebsd.org/~kib/overcommit/index.html
works, at least I believe so. I implemented overcommit turn-off knob
and did the exact anonymous memory accounting. Quite possible, the code
rotten since then.
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