Memory / swap leak?

Memory / swap leak?

[Phillip Susi]

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Something seems to be eating up all of my swap, but it defies explanation:

root@faldara:~# free -m
             total       used       free     shared    buffers     cached
Mem:          3929       2881       1048        146        192       1314
- -/+ buffers/cache:       1374       2555
Swap:         2047       2047          0

root@faldara:~# (for file in /proc/*/status ; do cat $file ; done) |
awk '/VmSwap/{sum += $2}END{ print sum}'
151804

So according to free, my entire 2 gb of swap is used, yet according to
proc, the total swap used by all processes in the system is only 151
mb.  How can this be?

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Re: Memory / swap leak?

[Hugh Dickins]

On Sun, 28 Dec 2014, Phillip Susi wrote:
> 
> Something seems to be eating up all of my swap, but it defies explanation:
> 
> root@faldara:~# free -m
>              total       used       free     shared    buffers     cached
> Mem:          3929       2881       1048        146        192       1314
> - -/+ buffers/cache:       1374       2555
> Swap:         2047       2047          0
> 
> root@faldara:~# (for file in /proc/*/status ; do cat $file ; done) |
> awk '/VmSwap/{sum += $2}END{ print sum}'
> 151804
> 
> So according to free, my entire 2 gb of swap is used, yet according to
> proc, the total swap used by all processes in the system is only 151
> mb.  How can this be?

shmem (tmpfs) uses swap, when it won't all fit in memory.  df or du on
tmpfs mounts in /proc/mounts will report on some of it (and the difference
between df and du should show if there are unlinked but still open files).
ipcs -m will report on SysV SHM.  /sys/kernel/debug/dri/*/i915_gem_objects
or similar should report on GEM objects.

Hugh

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Re: Memory / swap leak?

[Phillip Susi]

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On 12/29/2014 01:49 PM, Hugh Dickins wrote:
> shmem (tmpfs) uses swap, when it won't all fit in memory.  df or du
> on tmpfs mounts in /proc/mounts will report on some of it (and the
> difference between df and du should show if there are unlinked but
> still open files). ipcs -m will report on SysV SHM.
> /sys/kernel/debug/dri/*/i915_gem_objects or similar should report
> on GEM objects.

Thanks, I didn't think about tmpfs.  Turns out the Ubuntu bootchart
package filled the max 2G of the /dev tmpfs.



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