mm:min_free_kbytes in ubuntu_ltp failed with timeout on nodes with huge memory

[Po-Hsu Lin]

Issue found on:
* Bionic Oracle 5.4.0-1059.63~18.04.1 with instance BM.Standard2.52 only.
* Focal nv-dgx 5.4.0-1010.10 with node akis only

Test timeout with 3600 seconds on BM.Standard2.52

From test history, this test took 4403 second in the past. It's necessary to bump the timeout.

However even with this threshold bumped to 4800 seconds [1] it's still failing with node akis, which has 1.6T ram.

We will need to know how long will it take to run this test on akis.

https://git.launchpad.net/~canonical-kernel-team/+git/autotest-client-tests/commit/?id=16d206991

[Po-Hsu Lin (cypressyew)]

akis is not available for the test.

[Po-Hsu Lin (cypressyew)]

Test shows it will take ~95 minutes to run on Oracle BM.Standard2.52 (5.15.0-1017-oracle), which has 754G of RAM.

[Po-Hsu Lin (cypressyew)]

Timeout bumped for Oracle BM.Standard2.52
https://git.launchpad.net/~canonical-kernel-team/+git/autotest-client-tests/commit/?id=6f6c1759f5fa19460359902b359e7d4fab68fb82

Note that this bug can't be closed yet because of node akis mentioned above.

[Po-Hsu Lin (cypressyew)]

Issue found on node hidon (2048 GB ram) with J-nvidia 6.2.0-1011.11.
Test timeout with 6300 seconds threshold.