System low on memory+swap shortage message

[YONETANI Tomokazu]

Hi,

The wired pages stay at slightly less than 1.6G, but active and inactive
keep growing until it starts killing some processes.  A silly workaround
could be to run something as
$ perl -e '$x="@";$x=$x x 1048576; $x x 1048576'
so as the active count gets pushed back to something like 50M, which gives
me a few to several days without OOM.

Best Regards,
YONETANI Tomokazu.

On Thu, Aug 20, 2015 at 10:01:31AM -0700, Matthew Dillon wrote:
> Continue monitoring the wired pages (from systat -vm 1) on your system with
> the new kernel and see if those tick-up from day to day.
> 
> -Matt
> 
> On Tue, Aug 18, 2015 at 3:49 AM, YONETANI Tomokazu <y0n3t4n1 at gmail.com>
> wrote:
> 
> > Hi,
> >
> > On Sun, Aug 16, 2015 at 05:09:27PM -0700, Matthew Dillon wrote:
> > > There are numerous possibilities.  For example, tmpfs use.  You could
> > check
> > > if the wired page count has become excessive (could be an indication of a
> > > leak).  There was a bug fix made in master related to a memory leak from
> > > locked memory that was fixed on July 12 (a51ba7a69d2c5084f2 in master),
> > you
> > > could try cherry-picking that one into your local tree and see if it
> > helps.
> > >
> > > You'll need to do some more investigation.  The most likely possibility
> > is
> > > tmpfs use.  The wired memory leak is a possibility too but depends on the
> > > system workload.
> >
> > Thank you for the hints and cherry-picking the fix.  I updated the box
> > with the new source this morning, and I'll come back with the new result
> > later.
> >
> > On Sun, Aug 16, 2015 at 10:27:08PM +0800, Nuno Antunes wrote:
> > > Any clue in vmstat -m ?
> >
> > On older kernel, it looked like this; mostly occupied by vfscache,
> > then vnodes and HAMMER-inodes.  so I'm guessing either hammer cleanup,
> > updating the locate db, or git pull may have increased the usage.
> > tmpfs-related numbers were less than 100, on the other hand.
> >
> > $ sed -E 's/^(.{20})(.{7})(.*)$/\2&/' vmstat-m-before  |sort -nr |sed
> > 's/^.......//' |head -n5
> >            vfscache 881481  81743K      0K     764928K   1033104    0     0
> >              vnodes 420508 170832K      0K  134203388K    420508    0     0
> >       HAMMER-inodes 404482 353922K      0K  134203388K    416101    0     0
> >       HAMMER-others   3994    720K      0K     764928K   3754450    0     0
> >               devfs   3803    602K      0K     764928K      4382    0     0
> >
> >
> > Best Regards,
> > YONETANI Tomokazu.
> >