get_mem_cgroup_from

函数名称：get_mem_cgroup_from_mm: Obtain a reference on given mm_struct's memcg.*@mm: mm from which memcg should be extracted. It can be NULL.* Obtain a reference on mm->memcg and returns it if successful. Otherwise* root_mem_cgroup is returned

函数原型：struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)

返回类型：struct mem_cgroup

参数：

类型	参数	名称
struct mm_struct *	mm

927

如果mem_cgroup_disabled()则返回:NULL

930

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

931

循环

937

如果此条件成立可能性小(为编译器优化)(!mm)则memcg等于root_mem_cgroup

939

否则

940

memcg等于mem_cgroup_from_task(cu_dereference() - fetch RCU-protected pointer for dereferencing*@p: The pointer to read, prior to dereferencing* This is a simple wrapper around rcu_dereference_check().(* "owner" points to a task that is regarded as the canonical * user/owner of this mm. All of the following must be true in * order for it to be changed: * current == mm->owner * current->mm != mm * new_owner->mm == mm * new_owner->alloc_lock is held))

941

如果此条件成立可能性小(为编译器优化)(!memcg)则memcg等于root_mem_cgroup

944

当非ss_tryget - try to obtain a reference on the specified css*@css: target css* Obtain a reference on @css unless it already has reached zero and is* being released. This function doesn't care whether @css is on or* offline 循环

945

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

946

返回:memcg

**调用者**
名称	描述
get_mem_cgroup_from_current	If current->active_memcg is non-NULL, do not fallback to current->mm->memcg.
mem_cgroup_handle_over_high	Scheduled by try_charge() to be executed from the userland return path* and reclaims memory over the high limit.
mem_cgroup_try_charge	mem_cgroup_try_charge - try charging a page@page: page to charge@mm: mm context of the victim@gfp_mask: reclaim mode@memcgp: charged memcg return@compound: charge the page as compound or small page Try to charge @page to the memcg that @mm belongs
SYSCALL_DEFINE2	anotify syscalls
inotify_new_group

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告