---
# file: roles/performance_tuning/tasks/main.yaml

- name: Performance Tuning - Install Distribution - Release - Machine Prerequisites
  package:
    name: "{{ packages | flatten(levels=1) }}"
    state: latest
    update_cache: true
  tags:
    - install-dependencies

- name: Performance Tuning - Distribution - release - machine optimizations
  include_tasks: '{{ ansible_distribution|lower }}_{{ ansible_distribution_release }}.yaml'
  tags:
    - machine-optimizations

- name: Performance Tuning - Configure {{ ansible_machine }} Kernel Parameters
  lineinfile:
    path: "/etc/default/grub"
    state: "present"
    regexp: "^GRUB_CMDLINE_LINUX="
    line: "{{ grub_cmdline_linux[ansible_machine] | join() }}"
  notify:
    - "Update GRUB"
    - "Reboot server"
  tags:
    - set-grub

- name: Performance Tuning - Turbo Boost
  import_tasks: turbo_boost.yaml
  when: >
    cpu_microarchitecture == "skylake" or
    cpu_microarchitecture == "cascadelake"
  tags:
    - turbo-boost

- name: Performance Tuning - Adjust nr_hugepages
  # change the minimum size of the hugepage pool.
  # 2G VPP, 4GB per VNF/CNF, 2G reserve
  sysctl:
    name: "vm.nr_hugepages"
    value: "{{ sysctl.vm.nr_hugepages  }}"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - set-sysctl

- name: Performance Tuning - 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).
  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:
    - set-sysctl

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

- name: Performance Tuning - 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.
  sysctl:
    name: "vm.swappiness"
    value: "0"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - set-sysctl

- name: Performance Tuning - 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.
  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:
    - set-sysctl

- name: Performance Tuning - 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.
  sysctl:
    name: "kernel.watchdog_cpumask"
    value: "{{ sysctl.kernel.watchdog_cpumask }}"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - set-sysctl

- name: Performance Tuning - 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.
  sysctl:
    name: "kernel.randomize_va_space"
    value: "0"
    state: "present"
    sysctl_file: "/etc/sysctl.d/90-csit.conf"
    reload: "yes"
  tags:
    - set-sysctl

- name: Performance Tuning - Copy Cpufrequtils File
  copy:
    src: "files/cpufrequtils"
    dest: "/etc/default/cpufrequtils"
    owner: "root"
    group: "root"
    mode: "0644"
  tags:
    - copy-cpufrequtils

- name: Performance Tuning - Copy Irqbalance File
  template:
    src: "files/irqbalance"
    dest: "/etc/default/irqbalance"
    owner: "root"
    group: "root"
    mode: "0644"
  tags:
    - copy-irqbalance

- name: Performance Tuning - Set Ondemand Service To Disable
  service:
    name: "ondemand"
    enabled: "no"
  tags:
    - set-ondemand

- name: Performance Tuning - Load Kernel Modules By Default
  lineinfile:
    path: "/etc/modules"
    state: "present"
    line: "{{ item }}"
  with_items:
    - "vfio-pci"
  tags:
    - load-kernel-modules

- meta: flush_handlers