do_slab_free

函数名称：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

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

返回类型：void

参数：

类型	参数	名称
struct kmem_cache *	s
struct page *	page
void *	head
void *	tail
int	cnt
unsigned long	addr

2961

tail_obj等于如果tail否则head

2964

redo :

2971

循环

2972

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

2973

c等于raw_cpu_ptr(cpu_slab)

2974

当IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_PREEMPT)且此条件成立可能性小(为编译器优化)(tid != READ_ONCE( Globally unique transaction id ))循环

2978

The "volatile" is due to gcc bugs ()

2980

如果此条件成立可能性大(为编译器优化)(page == The slab from which we are allocating )则

2981

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

2983

如果此条件成立可能性小(为编译器优化)(!this_cpu_cmpxchg_double( Pointer to next available object , Globally unique transaction id , Pointer to next available object , tid, head, next_tid(tid)))则

2988

note_cmpxchg_failure("slab_free", s, tid)

2989

转到:redo

2991

stat(s, Free to cpu slab )

2992

否则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

**调用者**
名称	描述
slab_free

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