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path: root/ansible/roles/enable_hugepages_on_boot/tasks/main.yml
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# Copyright (c) 2017 Intel Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
---
- name: check if hugepages are set by this role
  command: "grep -o '{{ hugepage_param_regex }}' /etc/default/grub"
  register: is_mine_huge
  ignore_errors: True

# won't work in chroot
#- name: Detect EFI
#  stat: path="/sys/firmware/efi"
#  register: efi

- name: check if hugepages are set by someone else
  command: "grep -o 'default_hugepagesz=' /etc/default/grub"
  register: is_huge
  ignore_errors: True

- fail:
    msg: "Hugepages already set by someone else"
  when: is_mine_huge.stdout == "" and is_huge.stdout != ""

- name: configure hugepages as idempotent block
  block:
    - name: use 8 for auto num_hugepages and 1G size
      set_fact:
        num_hugepages: 8
      when: num_hugepages|default("auto") == "auto"

    - name: set hugepages in grub
      lineinfile:
        dest: /etc/default/grub
        regexp: '{{ hugepage_param_regex }}'
        line: '{{ hugepage_param }}'
        state: present

    - name: create hugetables mount
      file:
        path: "{{ hugetable_mount }}"
        state: directory

    - name: mount hugetlbfs
      mount:
        name: "{{ hugetable_mount }}"
        src: nodev
        fstype: hugetlbfs
        state: present

    - service:
        name: procps
        enabled: yes

    - include: manual_modify_grub.yml
      # only tested on Ubuntu, kernel line is probably different on other distros
      when: ansible_distribution == "Ubuntu"
  when: is_mine_huge.stdout == ""