infra-automation/roles/system_info/tasks/gather_memory.yml

---
# Memory information gathering tasks

- name: Gather memory information from Ansible facts
  set_fact:
    system_info_memory_total_mb: "{{ ansible_memtotal_mb }}"
    system_info_memory_free_mb: "{{ ansible_memfree_mb }}"
    system_info_swap_total_mb: "{{ ansible_swaptotal_mb }}"
    system_info_swap_free_mb: "{{ ansible_swapfree_mb }}"
  tags: [gather, memory]

- name: Gather detailed memory information
  shell: free -h
  register: system_info_free_raw
  changed_when: false
  tags: [gather, memory]

- name: Gather memory information from /proc/meminfo
  shell: cat /proc/meminfo | grep -iE "MemTotal|MemFree|MemAvailable|Buffers|Cached|SwapTotal|SwapFree|SwapCached"
  register: system_info_meminfo_raw
  changed_when: false
  tags: [gather, memory]

- name: Parse detailed memory values
  set_fact:
    system_info_mem_available_kb: "{{ system_info_meminfo_raw.stdout | regex_search('MemAvailable:\\s+(\\d+)', '\\1') | default(['0'], true) | first }}"
    system_info_mem_buffers_kb: "{{ system_info_meminfo_raw.stdout | regex_search('Buffers:\\s+(\\d+)', '\\1') | default(['0'], true) | first }}"
    system_info_mem_cached_kb: "{{ system_info_meminfo_raw.stdout | regex_search('Cached:\\s+(\\d+)', '\\1') | default(['0'], true) | first }}"
  tags: [gather, memory]

- name: Gather physical memory hardware information
  shell: dmidecode -t memory | grep -iE "Size|Type|Speed|Manufacturer|Serial Number|Locator" || echo "DMI memory info not available"
  register: system_info_dmi_memory_raw
  changed_when: false
  become: true
  failed_when: false
  tags: [gather, memory]

- name: Count physical memory modules
  shell: dmidecode -t memory | grep -c "^[[:space:]]*Size.*MB" || echo "0"
  register: system_info_memory_modules_count_raw
  changed_when: false
  become: true
  failed_when: false
  tags: [gather, memory]

- name: Gather swap devices information
  shell: swapon --show --noheadings || echo "No swap configured"
  register: system_info_swap_devices_raw
  changed_when: false
  tags: [gather, memory]

- name: Calculate memory usage percentage
  set_fact:
    system_info_memory_used_mb: "{{ ansible_memtotal_mb - ansible_memfree_mb }}"
    system_info_memory_usage_percent: "{{ ((ansible_memtotal_mb - ansible_memfree_mb) / ansible_memtotal_mb * 100) | round(2) }}"
  tags: [gather, memory]

- name: Calculate swap usage percentage
  set_fact:
    system_info_swap_used_mb: "{{ ansible_swaptotal_mb - ansible_swapfree_mb }}"
    system_info_swap_usage_percent: "{{ ((ansible_swaptotal_mb - ansible_swapfree_mb) / ansible_swaptotal_mb * 100) | round(2) if ansible_swaptotal_mb > 0 else 0 }}"
  tags: [gather, memory]

- name: Check for memory pressure
  shell: |
    if [ -f /proc/pressure/memory ]; then
      cat /proc/pressure/memory
    else
      echo "Memory pressure statistics not available"
    fi
  register: system_info_memory_pressure_raw
  changed_when: false
  failed_when: false
  tags: [gather, memory]

- name: Gather huge pages information
  shell: |
    grep -E "HugePages_|Hugepagesize" /proc/meminfo || echo "Huge pages not configured"
  register: system_info_hugepages_raw
  changed_when: false
  tags: [gather, memory]

- name: Aggregate memory information
  set_fact:
    system_info_memory:
      total_mb: "{{ system_info_memory_total_mb }}"
      free_mb: "{{ system_info_memory_free_mb }}"
      used_mb: "{{ system_info_memory_used_mb }}"
      available_kb: "{{ system_info_mem_available_kb }}"
      buffers_kb: "{{ system_info_mem_buffers_kb }}"
      cached_kb: "{{ system_info_mem_cached_kb }}"
      usage_percent: "{{ system_info_memory_usage_percent }}"
      physical_modules: "{{ system_info_memory_modules_count_raw.stdout | default('0') }}"
      hardware_details: "{{ system_info_dmi_memory_raw.stdout_lines | default([]) }}"
      pressure: "{{ system_info_memory_pressure_raw.stdout_lines | default([]) }}"
      hugepages: "{{ system_info_hugepages_raw.stdout_lines | default([]) }}"
      free_output: "{{ system_info_free_raw.stdout_lines }}"
  tags: [gather, memory]

- name: Aggregate swap information
  set_fact:
    system_info_swap:
      total_mb: "{{ system_info_swap_total_mb }}"
      free_mb: "{{ system_info_swap_free_mb }}"
      used_mb: "{{ system_info_swap_used_mb }}"
      usage_percent: "{{ system_info_swap_usage_percent }}"
      devices: "{{ system_info_swap_devices_raw.stdout_lines | default([]) }}"
  tags: [gather, memory]