Threaded 6.4 code compiled under 9.0 uses a lot more memory?..

[Konstantin Belousov]

On Wed, Oct 31, 2012 at 11:52:06AM -0700, Adrian Chadd wrote:
> On 31 October 2012 11:20, Ian Lepore <freebsd at damnhippie.dyndns.org> wrote:
> > I think there are some things we should be investigating about the
> > growth of memory usage.  I just noticed this:
> >
> > Freebsd 6.2 on an arm processor:
> >
> >   369 root 1   8  -88  1752K   748K nanslp   3:00  0.00% watchdogd
> >
> > Freebsd 10.0 on the same system:
> >
> >   367 root 1 -52   r0 10232K 10160K nanslp  10:04  0.00% watchdogd
> >
> > The 10.0 system is built with MALLOC_PRODUCTION (without that defined
> > the system won't even boot, it only has 64MB of ram).  That's a crazy
> > amount of growth for a relatively simple daemon.
> 
> Would you please, _please_ do some digging into this?
> 
> It's quite possible there's something in the libraries that are
> allocating some memory upon first call invocation - yes, that's
> jemalloc, but it could also be other things like stdio.
> 
> We really, really need to fix this userland bloat; it's terribly
> ridiculous at this point. There's no reason a watchdog daemon should
> take 10megabytes of RAM.
Watchdogd was recently changed to mlock its memory. This is the cause
of the RSS increase.

If not wired, swapout might cause a delay of the next pat, leading to
panic.
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