Add a function to return the current usage of the specified cgroup. The SGX driver will need this information to decide whether to reclaim EPC pages from a cgroup. Signed-off-by: Kristen Carlson Accardi <kristen@xxxxxxxxxxxxxxx> --- include/linux/misc_cgroup.h | 6 ++++++ kernel/cgroup/misc.c | 19 +++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/linux/misc_cgroup.h b/include/linux/misc_cgroup.h index d1aeb85f2ed6..a9dd087132dc 100644 --- a/include/linux/misc_cgroup.h +++ b/include/linux/misc_cgroup.h @@ -61,6 +61,7 @@ struct misc_cg { struct misc_cg *root_misc(void); struct misc_cg *parent_misc(struct misc_cg *cg); +unsigned long misc_cg_read(enum misc_res_type type, struct misc_cg *cg); unsigned long misc_cg_res_total_usage(enum misc_res_type type); int misc_cg_set_capacity(enum misc_res_type type, unsigned long capacity); int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, @@ -118,6 +119,11 @@ static inline struct misc_cg *parent_misc(struct misc_cg *cg) return NULL; } +static inline unsigned long misc_cg_read(enum misc_res_type type, struct misc_cg *cg) +{ + return 0; +} + static inline unsigned long misc_cg_res_total_usage(enum misc_res_type type) { return 0; diff --git a/kernel/cgroup/misc.c b/kernel/cgroup/misc.c index b22a055af9ad..e2c99fdc1d40 100644 --- a/kernel/cgroup/misc.c +++ b/kernel/cgroup/misc.c @@ -213,6 +213,25 @@ void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg, } EXPORT_SYMBOL_GPL(misc_cg_uncharge); +/** + * misc_cg_read() - Return the current usage of the misc cgroup res. + * @type: Type of the misc res. + * @cg: Misc cgroup whose usage will be read + * + * Context: Any context. + * Return: + * The current total usage of the specified misc cgroup. + * If an invalid misc_res_type is given, zero will be returned. + */ +unsigned long misc_cg_read(enum misc_res_type type, struct misc_cg *cg) +{ + if (!(valid_type(type) && cg)) + return 0; + + return atomic_long_read(&cg->res[type].usage); +} +EXPORT_SYMBOL_GPL(misc_cg_read); + /** * misc_cg_max_show() - Show the misc cgroup max limit. * @sf: Interface file -- 2.37.3