do_slab_free

Name:Fastpath with forced inlining to produce a kfree and kmem_cache_free that* can perform fastpath freeing without additional function calls.* The fastpath is only possible if we are freeing to the current cpu slab* of this processor

Proto:static __always_inline void do_slab_free(struct kmem_cache *s, struct page *page, void *head, void *tail, int cnt, unsigned long addr)

Type:void

Parameter:

Type	Parameter	Name
struct kmem_cache *	s
struct page *	page
void *	head
void *	tail
int	cnt
unsigned long	addr

2961

tail_obj = If tail Else head

2964

redo :

2971

2972

tid = Operations with implied preemption/interrupt protection. These* operations can be used without worrying about preemption or interrupt.( Globally unique transaction id )

2973

c = raw_cpu_ptr(cpu_slab)

2974

When IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_PREEMPT) && Value for the false possibility is greater at compile time(tid != READ_ONCE( Globally unique transaction id )) cycle

2978

The "volatile" is due to gcc bugs ()

2980

If Value is more likely to compile time(page == The slab from which we are allocating ) Then

2981

set_freepointer(s, tail_obj, Pointer to next available object )

2983

If Value for the false possibility is greater at compile time(!this_cpu_cmpxchg_double( Pointer to next available object , Globally unique transaction id , Pointer to next available object , tid, head, next_tid(tid))) Then

2988

note_cmpxchg_failure("slab_free", s, tid)

2989

Go to redo

2991

stat(s, Free to cpu slab )

2992

Else Slow path handling. This may still be called frequently since objects* have a longer lifetime than the cpu slabs in most processing loads.* So we still attempt to reduce cache line usage. Just take the slab* lock and free the item

**Caller**
Name	Describe
slab_free

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Function report