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vircgroupbackend.h
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vircgroupbackend.h
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/*
* vircgroupbackend.h: methods for cgroups backend
*
* Copyright (C) 2018 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "internal.h"
#include "vircgroup.h"
#include "virhash.h"
#define CGROUP_MAX_VAL 512
typedef enum {
VIR_CGROUP_NONE = 0, /* create subdir under each cgroup if possible. */
VIR_CGROUP_MEM_HIERACHY = 1 << 0, /* call virCgroupSetMemoryUseHierarchy
* before creating subcgroups and
* attaching tasks
*/
VIR_CGROUP_THREAD = 1 << 1, /* cgroup v2 handles threads differently */
VIR_CGROUP_SYSTEMD = 1 << 2, /* with systemd and cgroups v2 we cannot
* manually enable controllers that systemd
* doesn't know how to delegate */
} virCgroupBackendFlags;
typedef enum {
/* Adds a whole process with all threads to specific cgroup except
* to systemd named controller. */
VIR_CGROUP_TASK_PROCESS = 1 << 0,
/* Same as VIR_CGROUP_TASK_PROCESS but it also adds the task to systemd
* named controller. */
VIR_CGROUP_TASK_SYSTEMD = 1 << 1,
/* Moves only specific thread into cgroup except to systemd
* named controller. */
VIR_CGROUP_TASK_THREAD = 1 << 2,
} virCgroupBackendTaskFlags;
typedef enum {
VIR_CGROUP_BACKEND_TYPE_V2 = 0,
VIR_CGROUP_BACKEND_TYPE_V1,
VIR_CGROUP_BACKEND_TYPE_LAST,
} virCgroupBackendType;
typedef bool
(*virCgroupAvailableCB)(void);
typedef bool
(*virCgroupValidateMachineGroupCB)(virCgroupPtr group,
const char *name,
const char *drivername,
const char *machinename);
typedef int
(*virCgroupCopyMountsCB)(virCgroupPtr group,
virCgroupPtr parent);
typedef int
(*virCgroupCopyPlacementCB)(virCgroupPtr group,
const char *path,
virCgroupPtr parent);
typedef int
(*virCgroupDetectMountsCB)(virCgroupPtr group,
const char *mntType,
const char *mntOpts,
const char *mntDir);
typedef int
(*virCgroupDetectPlacementCB)(virCgroupPtr group,
const char *path,
const char *controllers,
const char *selfpath);
typedef int
(*virCgroupValidatePlacementCB)(virCgroupPtr group,
pid_t pid);
typedef char *
(*virCgroupStealPlacementCB)(virCgroupPtr group);
typedef int
(*virCgroupDetectControllersCB)(virCgroupPtr group,
int controllers);
typedef bool
(*virCgroupHasControllerCB)(virCgroupPtr cgroup,
int controller);
typedef int
(*virCgroupGetAnyControllerCB)(virCgroupPtr group);
typedef int
(*virCgroupPathOfControllerCB)(virCgroupPtr group,
int controller,
const char *key,
char **path);
typedef int
(*virCgroupMakeGroupCB)(virCgroupPtr parent,
virCgroupPtr group,
bool create,
unsigned int flags);
typedef int
(*virCgroupRemoveCB)(virCgroupPtr group);
typedef int
(*virCgroupAddTaskCB)(virCgroupPtr group,
pid_t pid,
unsigned int flags);
typedef int
(*virCgroupHasEmptyTasksCB)(virCgroupPtr cgroup,
int controller);
typedef int
(*virCgroupKillRecursiveCB)(virCgroupPtr group,
int signum,
virHashTablePtr pids);
typedef int
(*virCgroupBindMountCB)(virCgroupPtr group,
const char *oldroot,
const char *mountopts);
typedef int
(*virCgroupSetOwnerCB)(virCgroupPtr cgroup,
uid_t uid,
gid_t gid,
int controllers);
typedef int
(*virCgroupSetBlkioWeightCB)(virCgroupPtr group,
unsigned int weight);
typedef int
(*virCgroupGetBlkioWeightCB)(virCgroupPtr group,
unsigned int *weight);
typedef int
(*virCgroupGetBlkioIoServicedCB)(virCgroupPtr group,
long long *bytes_read,
long long *bytes_write,
long long *requests_read,
long long *requests_write);
typedef int
(*virCgroupGetBlkioIoDeviceServicedCB)(virCgroupPtr group,
const char *path,
long long *bytes_read,
long long *bytes_write,
long long *requests_read,
long long *requests_write);
typedef int
(*virCgroupSetBlkioDeviceWeightCB)(virCgroupPtr group,
const char *path,
unsigned int weight);
typedef int
(*virCgroupGetBlkioDeviceWeightCB)(virCgroupPtr group,
const char *path,
unsigned int *weight);
typedef int
(*virCgroupSetBlkioDeviceReadIopsCB)(virCgroupPtr group,
const char *path,
unsigned int riops);
typedef int
(*virCgroupGetBlkioDeviceReadIopsCB)(virCgroupPtr group,
const char *path,
unsigned int *riops);
typedef int
(*virCgroupSetBlkioDeviceWriteIopsCB)(virCgroupPtr group,
const char *path,
unsigned int wiops);
typedef int
(*virCgroupGetBlkioDeviceWriteIopsCB)(virCgroupPtr group,
const char *path,
unsigned int *wiops);
typedef int
(*virCgroupSetBlkioDeviceReadBpsCB)(virCgroupPtr group,
const char *path,
unsigned long long rbps);
typedef int
(*virCgroupGetBlkioDeviceReadBpsCB)(virCgroupPtr group,
const char *path,
unsigned long long *rbps);
typedef int
(*virCgroupSetBlkioDeviceWriteBpsCB)(virCgroupPtr group,
const char *path,
unsigned long long wbps);
typedef int
(*virCgroupGetBlkioDeviceWriteBpsCB)(virCgroupPtr group,
const char *path,
unsigned long long *wbps);
typedef int
(*virCgroupSetMemoryCB)(virCgroupPtr group,
unsigned long long kb);
typedef int
(*virCgroupGetMemoryStatCB)(virCgroupPtr group,
unsigned long long *cache,
unsigned long long *activeAnon,
unsigned long long *inactiveAnon,
unsigned long long *activeFile,
unsigned long long *inactiveFile,
unsigned long long *unevictable);
typedef int
(*virCgroupGetMemoryUsageCB)(virCgroupPtr group,
unsigned long *kb);
typedef int
(*virCgroupSetMemoryHardLimitCB)(virCgroupPtr group,
unsigned long long kb);
typedef int
(*virCgroupGetMemoryHardLimitCB)(virCgroupPtr group,
unsigned long long *kb);
typedef int
(*virCgroupSetMemorySoftLimitCB)(virCgroupPtr group,
unsigned long long kb);
typedef int
(*virCgroupGetMemorySoftLimitCB)(virCgroupPtr group,
unsigned long long *kb);
typedef int
(*virCgroupSetMemSwapHardLimitCB)(virCgroupPtr group,
unsigned long long kb);
typedef int
(*virCgroupGetMemSwapHardLimitCB)(virCgroupPtr group,
unsigned long long *kb);
typedef int
(*virCgroupGetMemSwapUsageCB)(virCgroupPtr group,
unsigned long long *kb);
typedef int
(*virCgroupAllowDeviceCB)(virCgroupPtr group,
char type,
int major,
int minor,
int perms);
typedef int
(*virCgroupDenyDeviceCB)(virCgroupPtr group,
char type,
int major,
int minor,
int perms);
typedef int
(*virCgroupAllowAllDevicesCB)(virCgroupPtr group,
int perms);
typedef int
(*virCgroupDenyAllDevicesCB)(virCgroupPtr group);
typedef int
(*virCgroupSetCpuSharesCB)(virCgroupPtr group,
unsigned long long shares);
typedef int
(*virCgroupGetCpuSharesCB)(virCgroupPtr group,
unsigned long long *shares);
typedef int
(*virCgroupSetCpuCfsPeriodCB)(virCgroupPtr group,
unsigned long long cfs_period);
typedef int
(*virCgroupGetCpuCfsPeriodCB)(virCgroupPtr group,
unsigned long long *cfs_period);
typedef int
(*virCgroupSetCpuCfsQuotaCB)(virCgroupPtr group,
long long cfs_quota);
typedef int
(*virCgroupGetCpuCfsQuotaCB)(virCgroupPtr group,
long long *cfs_quota);
typedef bool
(*virCgroupSupportsCpuBWCB)(virCgroupPtr cgroup);
typedef int
(*virCgroupGetCpuacctUsageCB)(virCgroupPtr group,
unsigned long long *usage);
typedef int
(*virCgroupGetCpuacctPercpuUsageCB)(virCgroupPtr group,
char **usage);
typedef int
(*virCgroupGetCpuacctStatCB)(virCgroupPtr group,
unsigned long long *user,
unsigned long long *sys);
typedef int
(*virCgroupSetFreezerStateCB)(virCgroupPtr group,
const char *state);
typedef int
(*virCgroupGetFreezerStateCB)(virCgroupPtr group,
char **state);
typedef int
(*virCgroupSetCpusetMemsCB)(virCgroupPtr group,
const char *mems);
typedef int
(*virCgroupGetCpusetMemsCB)(virCgroupPtr group,
char **mems);
typedef int
(*virCgroupSetCpusetMemoryMigrateCB)(virCgroupPtr group,
bool migrate);
typedef int
(*virCgroupGetCpusetMemoryMigrateCB)(virCgroupPtr group,
bool *migrate);
typedef int
(*virCgroupSetCpusetCpusCB)(virCgroupPtr group,
const char *cpus);
typedef int
(*virCgroupGetCpusetCpusCB)(virCgroupPtr group,
char **cpus);
struct _virCgroupBackend {
virCgroupBackendType type;
/* Mandatory callbacks that need to be implemented for every backend. */
virCgroupAvailableCB available;
virCgroupValidateMachineGroupCB validateMachineGroup;
virCgroupCopyMountsCB copyMounts;
virCgroupCopyPlacementCB copyPlacement;
virCgroupDetectMountsCB detectMounts;
virCgroupDetectPlacementCB detectPlacement;
virCgroupValidatePlacementCB validatePlacement;
virCgroupStealPlacementCB stealPlacement;
virCgroupDetectControllersCB detectControllers;
virCgroupHasControllerCB hasController;
virCgroupGetAnyControllerCB getAnyController;
virCgroupPathOfControllerCB pathOfController;
virCgroupMakeGroupCB makeGroup;
virCgroupRemoveCB remove;
virCgroupAddTaskCB addTask;
virCgroupHasEmptyTasksCB hasEmptyTasks;
virCgroupKillRecursiveCB killRecursive;
virCgroupBindMountCB bindMount;
virCgroupSetOwnerCB setOwner;
/* Optional cgroup controller specific callbacks. */
virCgroupSetBlkioWeightCB setBlkioWeight;
virCgroupGetBlkioWeightCB getBlkioWeight;
virCgroupGetBlkioIoServicedCB getBlkioIoServiced;
virCgroupGetBlkioIoDeviceServicedCB getBlkioIoDeviceServiced;
virCgroupSetBlkioDeviceWeightCB setBlkioDeviceWeight;
virCgroupGetBlkioDeviceWeightCB getBlkioDeviceWeight;
virCgroupSetBlkioDeviceReadIopsCB setBlkioDeviceReadIops;
virCgroupGetBlkioDeviceReadIopsCB getBlkioDeviceReadIops;
virCgroupSetBlkioDeviceWriteIopsCB setBlkioDeviceWriteIops;
virCgroupGetBlkioDeviceWriteIopsCB getBlkioDeviceWriteIops;
virCgroupSetBlkioDeviceReadBpsCB setBlkioDeviceReadBps;
virCgroupGetBlkioDeviceReadBpsCB getBlkioDeviceReadBps;
virCgroupSetBlkioDeviceWriteBpsCB setBlkioDeviceWriteBps;
virCgroupGetBlkioDeviceWriteBpsCB getBlkioDeviceWriteBps;
virCgroupSetMemoryCB setMemory;
virCgroupGetMemoryStatCB getMemoryStat;
virCgroupGetMemoryUsageCB getMemoryUsage;
virCgroupSetMemoryHardLimitCB setMemoryHardLimit;
virCgroupGetMemoryHardLimitCB getMemoryHardLimit;
virCgroupSetMemorySoftLimitCB setMemorySoftLimit;
virCgroupGetMemorySoftLimitCB getMemorySoftLimit;
virCgroupSetMemSwapHardLimitCB setMemSwapHardLimit;
virCgroupGetMemSwapHardLimitCB getMemSwapHardLimit;
virCgroupGetMemSwapUsageCB getMemSwapUsage;
virCgroupAllowDeviceCB allowDevice;
virCgroupDenyDeviceCB denyDevice;
virCgroupAllowAllDevicesCB allowAllDevices;
virCgroupDenyAllDevicesCB denyAllDevices;
virCgroupSetCpuSharesCB setCpuShares;
virCgroupGetCpuSharesCB getCpuShares;
virCgroupSetCpuCfsPeriodCB setCpuCfsPeriod;
virCgroupGetCpuCfsPeriodCB getCpuCfsPeriod;
virCgroupSetCpuCfsQuotaCB setCpuCfsQuota;
virCgroupGetCpuCfsQuotaCB getCpuCfsQuota;
virCgroupSupportsCpuBWCB supportsCpuBW;
virCgroupGetCpuacctUsageCB getCpuacctUsage;
virCgroupGetCpuacctPercpuUsageCB getCpuacctPercpuUsage;
virCgroupGetCpuacctStatCB getCpuacctStat;
virCgroupSetFreezerStateCB setFreezerState;
virCgroupGetFreezerStateCB getFreezerState;
virCgroupSetCpusetMemsCB setCpusetMems;
virCgroupGetCpusetMemsCB getCpusetMems;
virCgroupSetCpusetMemoryMigrateCB setCpusetMemoryMigrate;
virCgroupGetCpusetMemoryMigrateCB getCpusetMemoryMigrate;
virCgroupSetCpusetCpusCB setCpusetCpus;
virCgroupGetCpusetCpusCB getCpusetCpus;
};
typedef struct _virCgroupBackend virCgroupBackend;
typedef virCgroupBackend *virCgroupBackendPtr;
void
virCgroupBackendRegister(virCgroupBackendPtr backend);
virCgroupBackendPtr *
virCgroupBackendGetAll(void);
virCgroupBackendPtr
virCgroupBackendForController(virCgroupPtr group,
unsigned int controller);
#define VIR_CGROUP_BACKEND_CALL(group, controller, func, ret, ...) \
virCgroupBackendPtr backend = virCgroupBackendForController(group, controller); \
if (!backend) { \
virReportError(VIR_ERR_INTERNAL_ERROR, \
_("failed to get cgroup backend for '%s'"), #func); \
return ret; \
} \
if (!backend->func) { \
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, \
_("operation '%s' not supported"), #func); \
return ret; \
} \
return backend->func(group, ##__VA_ARGS__);