---
# file: tasks/main.yaml

- name: "Update Package Cache (APT)"
  ansible.builtin.apt:
    update_cache: true
    cache_valid_time: 3600
  when:
    - ansible_distribution|lower == 'ubuntu'
  tags:
    - perf-inst-prerequisites

- name: "Machine Prerequisites"
  ansible.builtin.package:
    name: "{{ packages | flatten(levels=1) }}"
    state: "latest"
  tags:
    - perf-inst-prerequisites

- name: "Turbo Boost"
  import_tasks: "turbo_boost.yaml"
  when: >
    cpu_microarchitecture == "icelake" or
    cpu_microarchitecture == "sapphirerapids" or
    cpu_microarchitecture == "emeraldrapids"
  tags:
    - perf-conf-turbo-boost

- name: "Adjust max_map_count"
  # this file contains the maximum number of memory map areas a process
  # may have. memory map areas are used as a side-effect of calling
  # malloc, directly by mmap and mprotect, and also when loading shared
  # libraries.
  #
  # while most applications need less than a thousand maps, certain
  # programs, particularly malloc debuggers, may consume lots of them,
  # e.g., up to one or two maps per allocation.
  # must be greater than or equal to (2 * vm.nr_hugepages).
  ansible.builtin.sysctl:
    name: "vm.max_map_count"
    value: "{{ sysctl.vm.nr_hugepages * 4  }}"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - perf-conf-sysctl

- name: "Adjust hugetlb_shm_group"
  # hugetlb_shm_group contains group id that is allowed to create sysv
  # shared memory segment using hugetlb page.
  ansible.builtin.sysctl:
    name: "vm.hugetlb_shm_group"
    value: "1000"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - perf-conf-sysctl

- name: "Adjust swappiness"
  # this control is used to define how aggressive the kernel will swap
  # memory pages.  higher values will increase agressiveness, lower values
  # decrease the amount of swap.  a value of 0 instructs the kernel not to
  # initiate swap until the amount of free and file-backed pages is less
  # than the high water mark in a zone.
  ansible.builtin.sysctl:
    name: "vm.swappiness"
    value: "0"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - perf-conf-sysctl

- name: "Adjust shmmax"
  # shared memory max must be greator or equal to the total size of hugepages.
  # for 2mb pages, totalhugepagesize = vm.nr_hugepages * 2 * 1024 * 1024
  # if the existing kernel.shmmax setting (cat /sys/proc/kernel/shmmax)
  # is greater than the calculated totalhugepagesize then set this parameter
  # to current shmmax value.
  ansible.builtin.sysctl:
    name: "kernel.shmmax"
    value: "{{ sysctl.vm.nr_hugepages * 2 * 1024 * 1024 }}"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - perf-conf-sysctl

- name: "Adjust watchdog_cpumask"
  # this value can be used to control on which cpus the watchdog may run.
  # the default cpumask is all possible cores, but if no_hz_full is
  # enabled in the kernel config, and cores are specified with the
  # nohz_full= boot argument, those cores are excluded by default.
  # offline cores can be included in this mask, and if the core is later
  # brought online, the watchdog will be started based on the mask value.
  #
  # typically this value would only be touched in the nohz_full case
  # to re-enable cores that by default were not running the watchdog,
  # if a kernel lockup was suspected on those cores.
  ansible.builtin.sysctl:
    name: "kernel.watchdog_cpumask"
    value: "{{ sysctl.kernel.watchdog_cpumask }}"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - perf-conf-sysctl

- name: "Adjust randomize_va_space"
  # this option can be used to select the type of process address
  # space randomization that is used in the system, for architectures
  # that support this feature.
  # 0 - turn the process address space randomization off.  this is the
  #     default for architectures that do not support this feature anyways,
  #     and kernels that are booted with the "norandmaps" parameter.
  ansible.builtin.sysctl:
    name: "kernel.randomize_va_space"
    value: "0"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - perf-conf-sysctl

- name: "Cpufrequtils"
  ansible.builtin.copy:
    src: "files/cpufrequtils"
    dest: "/etc/default/cpufrequtils"
    owner: "root"
    group: "root"
    mode: 0644
  tags:
    - perf-conf-cpufrequtils

- name: "Irqbalance"
  ansible.builtin.template:
    src: "files/irqbalance"
    dest: "/etc/default/irqbalance"
    owner: "root"
    group: "root"
    mode: 0644
  tags:
    - perf-conf-irqbalance

- name: "Kernel Parameters"
  ansible.builtin.lineinfile:
    path: "/etc/default/grub"
    state: "present"
    regexp: "^GRUB_CMDLINE_LINUX="
    line: "GRUB_CMDLINE_LINUX=\"{% for key, value in grub.items() %}{% if value is sameas true %}{{key}} {% else %}{{key}}={{value}} {% endif %}{% endfor %}\""
  notify:
    - "Update GRUB"
  tags:
    - perf-conf-grub

- meta: flush_handlers

- name: "Load Kernel Modules By Default"
  ansible.builtin.lineinfile:
    path: "/etc/modules"
    state: "present"
    line: "{{ item }}"
  with_items:
    - "vfio-pci"
  notify:
    - "Reboot Server"
  tags:
    - perf-conf-load-kernel-modules

- name: "Create a directory for 1G HugeTLBs hugepages"
  ansible.builtin.file:
    path: "/dev/hugepages1G"
    state: "directory"
    mode: 0755
  tags:
    - perf-conf-hugepages-1g

- name: "Mount 1G HugeTLBs hugepages"
  ansible.builtin.mount:
    path: "/dev/hugepages1G"
    src: "hugetlbfs"
    opts: "pagesize=1G"
    boot: false
    state: "mounted"
    fstype: "hugetlbfs"
  tags:
    - perf-conf-hugepages-1g

- name: "Create a directory if it does not exist"
  ansible.builtin.file:
    path: "/dev/hugepages2M"
    state: "directory"
    mode: 0755
  tags:
    - perf-conf-hugepages-2m

- name: "Create a directory for 2M HugeTLBs hugepages"
  ansible.builtin.mount:
    path: "/dev/hugepages2M"
    src: "hugetlbfs"
    opts: "pagesize=2M"
    boot: false
    state: "mounted"
    fstype: "hugetlbfs"
  tags:
    - perf-conf-hugepages-2m

- meta: flush_handlers