From 9d5f11a3c28d3268a7bf13913aaf3474d197b29c Mon Sep 17 00:00:00 2001
From: TAKAHASHI Shuuji <shuuji3@gmail.com>
Date: Sat, 25 Jul 2020 13:54:40 +0900
Subject: [PATCH] Copy tasks/manage-hugepages/scheduling-hugepages.md from en/
 directory.

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+---
+reviewers:
+- derekwaynecarr
+title: Manage HugePages
+content_type: task
+description: Configure and manage huge pages as a schedulable resource in a cluster.
+---
+
+<!-- overview -->
+{{< feature-state state="stable" >}}
+
+Kubernetes supports the allocation and consumption of pre-allocated huge pages
+by applications in a Pod. This page describes how users can consume huge pages.
+
+## {{% heading "prerequisites" %}}
+
+
+1. Kubernetes nodes must pre-allocate huge pages in order for the node to report
+   its huge page capacity. A node can pre-allocate huge pages for multiple
+   sizes.
+
+The nodes will automatically discover and report all huge page resources as
+schedulable resources.
+
+
+
+<!-- steps -->
+
+## API
+
+Huge pages can be consumed via container level resource requirements using the
+resource name `hugepages-<size>`, where `<size>` is the most compact binary
+notation using integer values supported on a particular node. For example, if a
+node supports 2048KiB and 1048576KiB page sizes, it will expose a schedulable
+resources `hugepages-2Mi` and `hugepages-1Gi`. Unlike CPU or memory, huge pages
+do not support overcommit. Note that when requesting hugepage resources, either
+memory or CPU resources must be requested as well.
+
+A pod may consume multiple huge page sizes in a single pod spec. In this case it
+must use `medium: HugePages-<hugepagesize>` notation for all volume mounts.
+
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: huge-pages-example
+spec:
+  containers:
+  - name: example
+    image: fedora:latest
+    command:
+    - sleep
+    - inf
+    volumeMounts:
+    - mountPath: /hugepages-2Mi
+      name: hugepage-2mi
+    - mountPath: /hugepages-1Gi
+      name: hugepage-1gi
+    resources:
+      limits:
+        hugepages-2Mi: 100Mi
+        hugepages-1Gi: 2Gi
+        memory: 100Mi
+      requests:
+        memory: 100Mi
+  volumes:
+  - name: hugepage-2mi
+    emptyDir:
+      medium: HugePages-2Mi
+  - name: hugepage-1gi
+    emptyDir:
+      medium: HugePages-1Gi
+```
+
+A pod may use `medium: HugePages` only if it requests huge pages of one size.
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: huge-pages-example
+spec:
+  containers:
+  - name: example
+    image: fedora:latest
+    command:
+    - sleep
+    - inf
+    volumeMounts:
+    - mountPath: /hugepages
+      name: hugepage
+    resources:
+      limits:
+        hugepages-2Mi: 100Mi
+        memory: 100Mi
+      requests:
+        memory: 100Mi
+  volumes:
+  - name: hugepage
+    emptyDir:
+      medium: HugePages
+```
+
+- Huge page requests must equal the limits. This is the default if limits are
+  specified, but requests are not.
+- Huge pages are isolated at a container scope, so each container has own limit on their cgroup sandbox as requested in a container spec.
+- EmptyDir volumes backed by huge pages may not consume more huge page memory
+  than the pod request.
+- Applications that consume huge pages via `shmget()` with `SHM_HUGETLB` must
+  run with a supplemental group that matches `proc/sys/vm/hugetlb_shm_group`.
+- Huge page usage in a namespace is controllable via ResourceQuota similar
+to other compute resources like `cpu` or `memory` using the `hugepages-<size>`
+token.
+- Support of multiple sizes huge pages is feature gated. It can be
+  enabled with the `HugePageStorageMediumSize` [feature
+gate](/docs/reference/command-line-tools-reference/feature-gates/) on the {{<
+glossary_tooltip text="kubelet" term_id="kubelet" >}} and {{<
+glossary_tooltip text="kube-apiserver"
+term_id="kube-apiserver" >}} (`--feature-gates=HugePageStorageMediumSize=true`).