Memory_balloon: Increase RSS sampling timeout

[BulaYoungR]

The test was failing because the host RSS drop did not reach the configured min_memory_difference within the default 30s window. Free Page Reporting can take longer to reclaim memory, especially on ARM hosts or under low memory pressure.

Committer: Bolatbek Issakh [email protected]

[BulaYoungR]

Before fix

(.libvirt-ci-venv-ci-runtest-dBuBxL) [root@ampere-mtsnow-altramax-17 libvirt-ci-latest-venv]# bin/avocado run --vt-type libvirt --vt-omit-data-loss --vt-machine-type arm64-mmio memory.balloon.freepagereporting.on.virtio --job-timeout 1200 --vt-connect-uri qemu:///system
No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
JOB ID     : 1c87ddf1ef081792d5929f9a0ecbe3f283e558c1
JOB LOG    : /var/log/avocado/job-results/job-2025-09-18T09.53-1c87ddf/job.log
 (1/1) type_specific.io-github-autotest-libvirt.memory.balloon.freepagereporting.on.virtio: STARTED
 (1/1) type_specific.io-github-autotest-libvirt.memory.balloon.freepagereporting.on.virtio: FAIL: Expected rss memory changed larger than 819200, but got 591936 (73.13 s)
RESULTS    : PASS 0 | ERROR 0 | FAIL 1 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB HTML   : /var/log/avocado/job-results/job-2025-09-18T09.53-1c87ddf/results.html
JOB TIME   : 74.59 s

Test summary:
1-type_specific.io-github-autotest-libvirt.memory.balloon.freepagereporting.on.virtio: FAIL

After fix

(.libvirt-ci-venv-ci-runtest-dBuBxL) [root@ampere-mtsnow-altramax-17 libvirt-ci-latest-venv]# bin/avocado run --vt-type libvirt --vt-omit-data-loss --vt-machine-type arm64-mmio memory.balloon.freepagereporting.on.virtio --job-timeout 1200 --vt-connect-uri qemu:///system
No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. Screendump and Windows guest BSOD detection are disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
No python imaging library installed. PPM image conversion to JPEG disabled. In order to enable it, please install python-imaging or the equivalent for your distro.
JOB ID     : bc52f7db1af912d8ce0e0281484246427103dafb
JOB LOG    : /var/log/avocado/job-results/job-2025-09-18T10.31-bc52f7d/job.log
 (1/1) type_specific.io-github-autotest-libvirt.memory.balloon.freepagereporting.on.virtio: STARTED
 (1/1) type_specific.io-github-autotest-libvirt.memory.balloon.freepagereporting.on.virtio: PASS (153.56 s)
RESULTS    : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB HTML   : /var/log/avocado/job-results/job-2025-09-18T10.31-bc52f7d/results.html
JOB TIME   : 155.42 s

[dzhengfy]

LGTM