Memory / swap leak?

DISCUSSION Phillip Susi 2 participants 3 messages Dec 29, 2014 – Dec 30, 2014 Memory management

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Phillip Susi

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2014-12-29 00:43 UTC #0 lore raw

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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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Hugh Dickins

2014-12-29 18:49 UTC #1 lore raw

Quoted 9 lines · Phillip Susi

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

Quoted 7 lines

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

Phillip Susi

author

2014-12-30 02:10 UTC #2 lore raw

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Quoted 6 lines · Hugh Dickins

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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