System low on memory+swap shortage message

[YONETANI Tomokazu]

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.
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