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Date:      Wed, 31 Oct 2012 21:06:23 +0200
From:      Konstantin Belousov <kostikbel@gmail.com>
To:        Adrian Chadd <adrian@freebsd.org>
Cc:        Ian Lepore <freebsd@damnhippie.dyndns.org>, freebsd-hackers@freebsd.org, Alfred Perlstein <bright@mu.org>, Dan Nelson <dnelson@allantgroup.com>, Karl Pielorz <kpielorz_lst@tdx.co.uk>, Konstantin Belousov <kostikbel@gmail.com>
Subject:   Re: Threaded 6.4 code compiled under 9.0 uses a lot more memory?..
Message-ID:  <20121031190623.GL73505@kib.kiev.ua>
In-Reply-To: <CAJ-VmokLJ7ed6Eye70_tQj1ohx-5i8%2BKkF7QZWuFzAQZEJPP2g@mail.gmail.com>
References:  <615577FED019BCA31EC4211B@Octca64MkIV.tdx.co.uk> <509012D3.5060705@mu.org> <20121030175138.GA73505@kib.kiev.ua> <C25F1D47C8D6BA6E3A072D4B@MightyAtom.tdx.co.uk> <20121031140630.GE73505@kib.kiev.ua> <E098A4DED6FCBCD6E248DF22@MightyAtom.tdx.co.uk> <20121031172136.GB21003@dan.emsphone.com> <CAJ-VmonCRcu_kLkmy8%2B2R6X5VjUUo-TOK8uT5qW7_aia81=3%2Bg@mail.gmail.com> <1351707655.1120.94.camel@revolution.hippie.lan> <CAJ-VmokLJ7ed6Eye70_tQj1ohx-5i8%2BKkF7QZWuFzAQZEJPP2g@mail.gmail.com>

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On Wed, Oct 31, 2012 at 11:52:06AM -0700, Adrian Chadd wrote:
> On 31 October 2012 11:20, Ian Lepore <freebsd@damnhippie.dyndns.org> wrot=
e:
> > 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.
>=20
> Would you please, _please_ do some digging into this?
>=20
> 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.
>=20
> 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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