vzalloc(9) centos man page | unix.com

VZALLOC(9)						    Memory Management in Linux							VZALLOC(9)

NAME
       vzalloc - allocate virtually contiguous memory with zero fill

SYNOPSIS
       void * vzalloc(unsigned long size);

ARGUMENTS
       size
	   allocation size Allocate enough pages to cover size from the page level allocator and map them into contiguous kernel virtual space.
	   The memory allocated is set to zero.

DESCRIPTION
       For tight control over page level allocator and protection flags use __vmalloc instead.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014								VZALLOC(9)