Commits on Feb 14, 2022

1. memcg_stress_test.sh: fix Available memory formula …

   In NUMA architecture, Sometimes too many node nodes will cause the system to retain too much free memory. Make the value of "memFree" in the /proc /meminfo file greater than the real available value. This resulted in memory over allocation (OOM) for this test.
   
   For example, this is a arm server‘s content of /proc/meminfo which has 128 cpus and 16 nodes :
   # cat /proc/meminfo 
   MemTotal:  		536018688 kB
   MemFree:		512151936 kB
   MemAvailable:		472947264 kB
   Buffers:		   8384 kB
   Cached:		1789376 kB
   SwapCached:		      0 KB
   Active:		1924288 kB
   Inactive:		1445888 kB
   Active(anom):		1608832 kB
   Inactive(amon)	  40512 kB
   Active(file):		 315456 kB
   Inactive(file):     1405376 kB
   Unevictable:		  31744 KB
   ....
   
   Therefore, it is suggested to change the "memFree" in the calculation formula to "memavailable". Of course, this will give the system more memory pressure, but also the script reserve half of the swap to alleviate this problem.

   

   Giles2000 authored Feb 14, 2022
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