Registers expected mbuf usage.
#include <sys/types.h> #include <sys/errno.h> #include <sys/mbuf.h>
void m_reg (mbp) struct mbreq mbp;
| mbp | Defines the address of an mbreq structure that specifies expected mbuf usage. |
The m_reg kernel service lets users of mbuf services specify initial requirements. The m_reg kernel service also allows the buffer pool low-water and deallocation marks to be adjusted based on expected usage. Its use is recommended for better control of the buffer pool.
When the number of free mbuf structures falls below the low-water mark, the total mbuf pool is expanded. When the number of free mbuf structures rises above the deallocation mark, the total mbuf pool is contracted and resources are returned to the system.
The m_reg kernel service can be called from the process environment only.
The m_reg service has no return values.
The m_reg kernel service is part of Base Operating System (BOS) Runtime.
The mbreq structure for mbuf kernel services, the m_dereg kernel service.
I/O Kernel Services in AIX Kernel Extensions and Device Support Programming Concepts.