Parameters

struct dmem_cgroup_pool_state *limit_pool

The pool for which we hit limits

struct dmem_cgroup_pool_state *test_pool

The pool for which to test

bool ignore_low

Whether we have to respect low watermarks.

bool *ret_hit_low

Pointer to whether it makes sense to consider low watermark.

Description

This function returns true if we can evict from test_pool, false if not. When returning false and ignore_low is false, ret_hit_low may be set to true to indicate this function can be retried with ignore_low set to true.

Return

bool

Parameters

struct dmem_cgroup_region *region

The region to unregister.

Description

This function undoes dmem_cgroup_register_region. It drains any in-flight reclaim callbacks before returning, so the caller may safely free the resources pointed to by the reclaim_priv that was passed at registration time.

Parameters

const struct dmem_cgroup_init *init

Initialization parameters for the region.

const char *fmt

Region parameters to register

...

variable arguments

Description

This function registers a node in the dmem cgroup with the name given. After calling this function, the region can be used for allocations.

Return

NULL or a struct on success, PTR_ERR on failure.

Parameters

struct dmem_cgroup_pool_state *pool

dmem_cgroup_pool_state

Description

Called to drop a reference to the limiting pool returned by dmem_cgroup_try_charge().

Parameters

struct dmem_cgroup_pool_state *pool

Pool to uncharge.

u64 size

Size to uncharge.

Description

Undoes the effects of dmem_cgroup_try_charge. Must be called with the returned pool as argument, and same index and size.

Parameters

struct dmem_cgroup_region *region

dmem region to charge

u64 size

Size (in bytes) to charge.

struct dmem_cgroup_pool_state **ret_pool

On successful allocation, the pool that is charged.

struct dmem_cgroup_pool_state **ret_limit_pool

On a failed allocation, the limiting pool.

Description

This function charges the region region for a size of size bytes.

If the function succeeds, ret_pool is set, which must be passed to dmem_cgroup_uncharge() when undoing the allocation.

When this function fails with -EAGAIN and ret_limit_pool is non-null, it will be set to the pool for which the limit is hit. This can be used for eviction as argument to dmem_cgroup_state_evict_valuable(). This reference must be freed with dmem_cgroup_pool_state_put().

Return

0 on success, -EAGAIN on hitting a limit, or a negative errno on failure.

Parameters

struct dmem_cgroup_pool_state *root

Root of the subtree to calculate protection for, or NULL to calculate global protection.

struct dmem_cgroup_pool_state *test

The pool to test the usage/min limit of.

Return

true if usage is below min and the cgroup is protected, false otherwise.

Parameters

struct dmem_cgroup_pool_state *root

Root of the subtree to calculate protection for, or NULL to calculate global protection.

struct dmem_cgroup_pool_state *test

The pool to test the usage/low limit of.

Return

true if usage is below low and the cgroup is protected, false otherwise.

Parameters

struct dmem_cgroup_pool_state *a

First pool to find the common ancestor of.

struct dmem_cgroup_pool_state *b

First pool to find the common ancestor of.

Return

The first pool that is a parent of both a and b, or NULL if either a or b are NULL, or if such a pool does not exist. A reference to the returned pool is grabbed and must be released by the caller when it is done using the pool.