memcg_stress_test.sh: fix Available memory formula #915
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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.
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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.