The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
The following memory parameters are defined:
memory.failcnt
Specifies the number of times that the amount of memory used by
a cgroup has risen to memory.limit_in_bytes.
memory.force_empty
If a cgroup has no tasks, setting the value to 0 removes all pages from memory that were used by tasks in the cgroup. Setting the parameter in this way avoids a parent cgroup from being assigned the defunct page caches when you remove its child cgroup.
memory.limit_in_bytes
Specifies the maximum usage permitted for user memory including
the file cache. The default units are bytes, but you can also
specify a k or K,
m or M, and
g or G suffix for
kilobytes, megabytes, and gigabytes respectively. A value of -1
removes the limit.
To avoid an out-of-memory error, set the value of
memory.limit_in_bytes lower than
memory.memsw.limit_in_bytes, and set
memory.memsw.limit_in_bytes lower than the
amount of available swap space.
memory.max_usage_in_bytes
Reports the maximum amount of user memory in bytes used by tasks in the cgroup.
memory.memsw.failcnt
Specifies the number of times that the amount of memory and swap
space used by a cgroup has risen to
memory.memsw.limit_in_bytes.
memory.memsw.limit_in_bytes
Specifies the maximum usage permitted for user memory plus swap
space. The default units are bytes, but you can also specify a
k or K,
m or M, and
g or G suffix for
kilobytes, megabytes, and gigabytes respectively. A value of -1
removes the limit.
memory.memsw.max_usage_in_bytes
Reports the maximum amount of user memory and swap space in bytes used by tasks in the cgroup.
memory.memsw.usage_in_bytes
Reports the total size in bytes of the memory and swap space used by tasks in the cgroup.
memory.move_charge_at_immigrate
Specifies whether a task's charges are moved when you migrate
the task between cgroups. You can specify the
following values.
Setting | Description |
|---|---|
| Disable moving task charges. |
| Moves charges for an in-use or swapped-out anonymous page exclusively owned by the task. |
| Moves charges for file pages that are memory mapped by the task. |
| Equivalent to specifying both 1 and 2. |
memory.numa_stat
Reports the NUMA memory usage in bytes for each memory node (N0, N1,...) together with the following statistics.
Statistic | Description |
|---|---|
| The size in bytes of anonymous and swap cache. |
| The size in bytes of file-backed memory. |
|
The sum of the |
| The size in bytes of unreclaimable memory. |
memory.oom_control
Displays the values of the out-of-memory (OOM) notification control feature.
Setting | Description |
|---|---|
| Whether the OOM killer is enabled (0) or disabled (1). |
| Whether the cgroup is under OOM control (1) allowing tasks to be stopped, or not under OOM control (0). |
memory.soft_limit_in_bytes
Specifies a soft, upper limit for user memory including the file
cache. The default units are bytes, but you can also specify a
k or K,
m or M, and
g or G suffix for
kilobytes, megabytes, and gigabytes respectively. A value of -1
removes the limit.
The soft limit should be lower than the hard-limit value of
memory.limit_in_bytes as the hard limit
always takes precedence.
memory.stat
Reports the following memory statistics.
Statistic | Description |
|---|---|
| The size in bytes of anonymous and swap cache on active least-recently-used (LRU) list (includes tmpfs). |
| The size in bytes of file-backed memory on active LRU list. |
|
The size in bytes of page cache (includes
|
| The size in bytes of the limit of memory for the cgroup hierarchy. |
| The size in bytes of the limit of memory plus swap for the cgroup hierarchy. |
|
The size in bytes of anonymous and swap cache on
inactive LRU list (includes
|
| The size in bytes of file-backed memory on inactive LRU list. |
|
The size in bytes of memory-mapped files (includes
|
| The number of page faults, where the kernel has to allocate and initialize physical memory for use in the virtual address space of a process. |
| The number of major page faults, where the kernel has to actively free physical memory before allocation and initialization. |
| The number of paged-in pages of memory. |
| The number of paged-out pages of memory. |
|
The size in bytes of anonymous and swap cache (does
not include |
| The size in bytes of used swap space. |
| The value of the appended statistic for the cgroup and all of its children. |
| The size in bytes of memory that in not reclaimable. |
memory.swappiness
Specifies a bias value for the kernel to swap out memory pages used by processes in the cgroup rather than reclaim pages from the page cache. A value smaller than the default value of 60 reduces the kernel's preference for swapping out. A value greater than 60 increases the preference for swapping out. A value greater than 100 allows the system to swap out pages that fall within the address space of the cgroup's tasks.
memory.usage_in_bytes
Reports the total size in bytes of the memory used by all the tasks in the cgroup.
memory.use_hierarchy
Specifies whether the kernel should attempt to reclaim memory from a cgroup's hierarchy. The default value of 0 prevents memory from being reclaimed from other tasks in the hierarchy. A value of 1 allows memory to be reclaimed from other tasks in the hierarchy.