Set specs value the same as kernel API input

This partially revert opencontainers#648 , after a second thought, I think we
should use specs value the same as kernel API input, see:
opencontainers#692 (comment)

For memory and hugetlb limits *.limit_in_bytes, cgroup APIs take the values
as string, but the parsed values are unsigned long, see:
https://github.com/torvalds/linux/blob/v4.10/mm/page_counter.c#L175-L193

For `cpu.cfs_quota_us` and `cpu.rt_runtime_us`, cgroup APIs take the input
value as signed long long, while `cpu.cfs_period_us` and `cpu.rt_periof_us`
take the input value as unsigned long long.

Signed-off-by: Qiang Huang <[email protected]>

Author: hqhq

config-linux.md

@@ -285,15 +285,15 @@ For more information, see [the memory cgroup man page][cgroup-v1-memory].
 
 The following parameters can be specified to setup the controller:
 
-* **`limit`** *(int64, OPTIONAL)* - sets limit of memory usage in bytes
+* **`limit`** *(uint64, OPTIONAL)* - sets limit of memory usage in bytes
 
-* **`reservation`** *(int64, OPTIONAL)* - sets soft limit of memory usage in bytes
+* **`reservation`** *(uint64, OPTIONAL)* - sets soft limit of memory usage in bytes
 
-* **`swap`** *(int64, OPTIONAL)* - sets limit of memory+Swap usage
+* **`swap`** *(uint64, OPTIONAL)* - sets limit of memory+Swap usage
 
-* **`kernel`** *(int64, OPTIONAL)* - sets hard limit for kernel memory
+* **`kernel`** *(uint64, OPTIONAL)* - sets hard limit for kernel memory
 
-* **`kernelTCP`** *(int64, OPTIONAL)* - sets hard limit in bytes for kernel TCP buffer memory
+* **`kernelTCP`** *(uint64, OPTIONAL)* - sets hard limit in bytes for kernel TCP buffer memory
 
 * **`swappiness`** *(uint64, OPTIONAL)* - sets swappiness parameter of vmscan (See sysctl's vm.swappiness)
 
@@ -414,7 +414,7 @@ Each entry has the following structure:
 
 * **`pageSize`** *(string, REQUIRED)* - hugepage size
 
-* **`limit`** *(int64, REQUIRED)* - limit in bytes of *hugepagesize* HugeTLB usage
+* **`limit`** *(uint64, REQUIRED)* - limit in bytes of *hugepagesize* HugeTLB usage
 
 ###### Example
 

schema/config-linux.json

@@ -163,7 +163,7 @@
                                     "type": "string"
                                 },
                                 "limit": {
-                                    "$ref": "defs.json#/definitions/int64"
+                                    "$ref": "defs.json#/definitions/uint64"
                                 }
                             },
                             "required": [
@@ -178,23 +178,23 @@
                         "properties": {
                             "kernel": {
                                 "id": "https://opencontainers.org/schema/bundle/linux/resources/memory/kernel",
-                                "$ref": "defs.json#/definitions/int64"
+                                "$ref": "defs.json#/definitions/uint64"
                             },
                             "kernelTCP": {
                                 "id": "https://opencontainers.org/schema/bundle/linux/resources/memory/kernelTCP",
-                                "$ref": "defs.json#/definitions/int64"
+                                "$ref": "defs.json#/definitions/uint64"
                             },
                             "limit": {
                                 "id": "https://opencontainers.org/schema/bundle/linux/resources/memory/limit",
-                                "$ref": "defs.json#/definitions/int64"
+                                "$ref": "defs.json#/definitions/uint64"
                             },
                             "reservation": {
                                 "id": "https://opencontainers.org/schema/bundle/linux/resources/memory/reservation",
-                                "$ref": "defs.json#/definitions/int64"
+                                "$ref": "defs.json#/definitions/uint64"
                             },
                             "swap": {
                                 "id": "https://opencontainers.org/schema/bundle/linux/resources/memory/swap",
-                                "$ref": "defs.json#/definitions/int64"
+                                "$ref": "defs.json#/definitions/uint64"
                             },
                             "swappiness": {
                                 "id": "https://opencontainers.org/schema/bundle/linux/resources/memory/swappiness",

specs-go/config.go

@@ -225,7 +225,7 @@ type LinuxHugepageLimit struct {
 	// Pagesize is the hugepage size
 	Pagesize string `json:"pageSize"`
 	// Limit is the limit of "hugepagesize" hugetlb usage
-	Limit int64 `json:"limit"`
+	Limit uint64 `json:"limit"`
 }
 
 // LinuxInterfacePriority for network interfaces
@@ -281,15 +281,15 @@ type LinuxBlockIO struct {
 // LinuxMemory for Linux cgroup 'memory' resource management
 type LinuxMemory struct {
 	// Memory limit (in bytes).
-	Limit *int64 `json:"limit,omitempty"`
+	Limit *uint64 `json:"limit,omitempty"`
 	// Memory reservation or soft_limit (in bytes).
-	Reservation *int64 `json:"reservation,omitempty"`
+	Reservation *uint64 `json:"reservation,omitempty"`
 	// Total memory limit (memory + swap).
-	Swap *int64 `json:"swap,omitempty"`
+	Swap *uint64 `json:"swap,omitempty"`
 	// Kernel memory limit (in bytes).
-	Kernel *int64 `json:"kernel,omitempty"`
+	Kernel *uint64 `json:"kernel,omitempty"`
 	// Kernel memory limit for tcp (in bytes)
-	KernelTCP *int64 `json:"kernelTCP,omitempty"`
+	KernelTCP *uint64 `json:"kernelTCP,omitempty"`
 	// How aggressive the kernel will swap memory pages. Range from 0 to 100.
 	Swappiness *uint64 `json:"swappiness,omitempty"`
 }