[Bugs] [Bug 1457936] possible memory leak in glusterfsd with multiplexing

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1457936



--- Comment #8 from Raghavendra G <rgowdapp at redhat.com> ---
After reverting my changes, following are the numbers repeating same test in
comment #7

Iteration 1:
===========
 7999 root      20   0 90.1g 1.6g 3080 S 21.4 21.4  24:00.70 glusterfsd         
23628 root      20   0 1080m 203m 2552 S  0.0  2.6   1:42.92 glusterd           

[root at unused glusterfs]# ls -l /proc/7999/task | wc -l
12007

Iteration 2:
===========
 7999 root      20   0 90.1g 1.3g 2840 S 17.4 17.4  25:19.69 glusterfsd         
23628 root      20   0 1080m 147m 2532 S  0.0  1.9   1:43.57 glusterd           

[root at unused glusterfs]# ls -l /proc/7999/task | wc -l
12008

after umounting all clients:
 7999 root      20   0 90.1g 1.3g 2868 S  0.7 17.4  25:43.06 glusterfsd         
23628 root      20   0 1080m 147m 2532 S  0.0  1.9   1:43.62 glusterd           

[root at unused glusterfs]# ls -l /proc/7999/task | wc -l
12008

Though not much of change in memory consumption, cpu consumption is reduced

Iteration 3:
============
 7999 root      20   0 90.1g 1.2g 2588 S 19.7 15.4  26:12.50 glusterfsd         
23628 root      20   0 1080m 133m 2284 S  0.0  1.7   1:44.21 glusterd           

As compared to tests in comment #7, the memory consumption has not increased
very much (though there is around 8g increase of virtual memory consumption).
But there is some significant increase in CPU consumption (0-1% vs 15-20%).

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