os0numa.h File Reference

NUMA API wrapper over various operating system specific APIs. More...

#include "mysql/components/library_mysys/my_system.h"
#include "univ.i"
#include <numa.h>

Go to the source code of this file.

Functions
int	os_numa_available ()
	Check if NUMA is available. More...
int	os_numa_num_configured_cpus ()
	Get the number of CPUs in the system, including disabled ones. More...
int	os_numa_node_of_cpu (int cpu)
	Get the NUMA node of a given CPU. More...
void *	os_numa_alloc_onnode (size_t size, int node)
	Allocate a memory on a given NUMA node. More...
void	os_numa_free (void *ptr, size_t size)
	Free a memory allocated by os_numa_alloc_onnode(). More...

Detailed Description

NUMA API wrapper over various operating system specific APIs.

The os_numa*() functions in this file mimic the numa*() Linux API that is documented in numa(3). They take the same arguments, have the same return type and behave in the same way. There are two purposes behind this:

1. Have zero learning curve for developers already familiar with the Linux API.
2. Linux's numa*() functions are documented in more detail than ours os_numa*(). Should any doubt arise about the behavior, the Linux docs should be referred.

Created Jul 16, 2015 Vasil Dimov

Function Documentation

os_numa_alloc_onnode()

void * os_numa_alloc_onnode ( size_t  size, int  node  )

inline

Allocate a memory on a given NUMA node.

Parameters

[in]	size	number of bytes to allocate
[in]	node	NUMA node on which to allocate the memory

Returns

pointer to allocated memory or nullptr if allocation failed

os_numa_available()

int os_numa_available ( )

inline

Check if NUMA is available.

This function must be called before any other os_numa_*() functions and it must return != -1, otherwise the behavior of the rest of the functions is undefined.

Returns

!= -1 if available.

os_numa_free()

void os_numa_free ( void *  ptr, size_t  size  )

inline

Free a memory allocated by os_numa_alloc_onnode().

Parameters

[in]	ptr	pointer to memory to free
[in]	size	size of the memory

os_numa_node_of_cpu()

int os_numa_node_of_cpu ( int  cpu )

inline

Get the NUMA node of a given CPU.

Parameters

[in]

cpu

CPU whose NUMA node to return, must be obtained using os_getcpu().

Returns

NUMA node id

os_numa_num_configured_cpus()

int os_numa_num_configured_cpus ( )

inline

Get the number of CPUs in the system, including disabled ones.

Returns

number of CPUs