The cornerstone of Redis memory management ZMALLC.C Source code interpretation (appendix): Source Structure table

• The cornerstone of Redis memory management ZMALLC.C Source code interpretation (a)
  
• The cornerstone of Redis memory management ZMALLC.C Source code interpretation (ii)
  

The previous two posts, detailed introduction of the ZMALLOC.C file of the various functions, but we want to learn more redis, but also need to see the source code is, I combed the structure of the zmalloc.c file, for everyone to read the source code to facilitate.

Global variables

name	type	Description
Used_memory	Static size_t	Size of Redis used memory space
Zmalloc_thread_safe	static int	Identifies whether thread-safe
Used_memory_mutex	pthread_mutex_t	Mutual exclusion Lock when modifying variable used_memory
Zmalloc_oom_handler	static void (*) (size_t)	function pointer to function called when memory is low

Function Main function

name	Description
Zmalloc	Allocating memory space
Zfree	Free up space allocated by Zmalloc
Zcalloc	Allocate memory space and initialize to 0
Zrealloc	Size of the reallocation space
Zstrdup	String copy
Zlibc_free	With free ()

Other functions

name	Description
Zmalloc_enable_thread_safeness	Set the thread safety ID (zmalloc_thread_safe 1)
Zmalloc_get_fragmentation_ratio	Memory Utilization: Rss/used_memory
zmalloc_get_memory_size	Returns the size of the system's physical memory (in bytes)
Zmalloc_get_private_dirty	/proc/self/smapssize of "Private Dirty" in the query
Zmalloc_get_rss	/proc/<pid>/statget RSS values by querying a file
Zmalloc_get_smap_bytes_by_field	The /proc/self/smaps size of the specified field for the query
Zmalloc_set_oom_handler	Set the value of the Oom (out of memory) function pointer
Zmalloc_size	Querying the size of the system's actual allocated memory space
Zmalloc_used_memory	Query the size of the used space (used_memory)

zmalloc_get_memory_size()This function has not been included in the latest Redis release. Only in the current (2015/04) GitHub development version.

Honghong function

name	Description
Update_zamlloc_stat_alloc	Update the value of Used_memory after allocating memory space
Update_zamlloc_stat_free	Update the value of Used_memory after releasing memory space
Update_zamlloc_stat_add	Thread Safely used_memory Add operations
Update_zamlloc_stat_sub	Thread safely used_memory reduce operations

Macro

name	Description
Prefix_size	Allocating more space than required for memory allocation
Have_malloc_size	Define this macro if you use Tcmalloc, Jemalloc, or Mac systems

The cornerstone of Redis memory management ZMALLC.C Source code interpretation (appendix): Source Structure table