get_mem_cgroup_from

Name: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

Proto:struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)

Type:struct mem_cgroup

Parameter:

Type	Parameter	Name
struct mm_struct *	mm

927

If mem_cgroup_disabled() Then Return 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

937

If Value for the false possibility is greater at compile time(!mm) Then memcg = root_mem_cgroup

939

Else

940

memcg = mem_cgroup_from_task( fetch RCU-protected pointer for dereferencing(* "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

If Value for the false possibility is greater at compile time(!memcg) Then memcg = root_mem_cgroup

944

When Not 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 cycle

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

Return memcg

**Caller**
Name	Describe
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

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Function report