Data Structures
struct	m0_processor_descr

struct	processor_sys_summary

struct	processor_node

struct	processor_global

struct	getcpu_thr_data

Macros
#define	M0_PROCESSORS_INVALID_ID ((uint32_t)-1)

#define	PROCESSORS_INFO_ENV "M0_PROCESSORS_INFO_DIR"

#define	PROCESSORS_SYSFS_DIR "/sys/devices/system"

#define	PROCESSORS_CPU_DIR "cpu/"

#define	PROCESSORS_NODE_DIR "node/"

#define	PROCESSORS_MAX_FILE "cpu/kernel_max"

#define	PROCESSORS_POSS_FILE "cpu/possible"

#define	PROCESSORS_PRESENT_FILE "cpu/present"

#define	PROCESSORS_ONLINE_FILE "cpu/online"

#define	PROCESSORS_CACHE1_LEVEL_FILE "cache/index0/level"

#define	PROCESSORS_CACHE2_LEVEL_FILE "cache/index1/level"

#define	PROCESSORS_CACHE3_LEVEL_FILE "cache/index2/level"

#define	PROCESSORS_CACHE1_SHCPUMAP_FILE "cache/index0/shared_cpu_map"

#define	PROCESSORS_CACHE2_SHCPUMAP_FILE "cache/index1/shared_cpu_map"

#define	PROCESSORS_CACHE3_SHCPUMAP_FILE "cache/index2/shared_cpu_map"

#define	PROCESSORS_CACHE1_SIZE_FILE "cache/index0/size"

#define	PROCESSORS_CACHE2_SIZE_FILE "cache/index1/size"

#define	PROCESSORS_CACHE3_SIZE_FILE "cache/index2/size"

#define	PROCESSORS_COREID_FILE "topology/core_id"

#define	PROCESSORS_PHYSID_FILE "topology/physical_package_id"

#define	PROCESSORS_CPU_DIR_PREFIX "cpu/cpu"

#define	PROCESSORS_NODE_STR "node"

#define	PROCESSORS_CPU_STR "cpu"

Typedefs
typedef uint32_t	m0_processor_nr_t

Enumerations
enum	{ PROCESSORS_RANGE_SET_SEPARATOR = ',', PROCESSORS_RANGE_SEPARATOR = '-', PROCESSORS_L1 = 1, PROCESSORS_L2 = 2, MAX_LINE_LEN = 256 }

enum	map { PROCESSORS_POSS_MAP = 0, PROCESSORS_AVAIL_MAP = 1, PROCESSORS_ONLN_MAP = 2 }

Functions
M0_INTERNAL int	m0_processors_init (void)

M0_INTERNAL void	m0_processors_fini (void)

M0_INTERNAL m0_processor_nr_t	m0_processor_nr_max (void)

M0_INTERNAL void	m0_processors_possible (struct m0_bitmap *map)

M0_INTERNAL void	m0_processors_available (struct m0_bitmap *map)

M0_INTERNAL void	m0_processors_online (struct m0_bitmap *map)

M0_INTERNAL m0_processor_nr_t	m0_processor_id_get (void)

M0_INTERNAL int	m0_processor_describe (m0_processor_nr_t id, struct m0_processor_descr *pd)

M0_INTERNAL bool	m0_processor_is_vm (void)

static void	processor_map_set (struct m0_bitmap map, const char mapstr)

static int	processor_map_type_set (enum map map_type)

static uint32_t	number_read (const char *filename)

static void	processor_maxsz_get ()

static uint32_t	processor_numanodeid_get (m0_processor_nr_t id)

static uint32_t	processor_coreid_get (m0_processor_nr_t id)

static uint32_t	processor_physid_get (m0_processor_nr_t id)

static bool	processor_is_cache_shared (const char *mapstr)

static size_t	processor_l1_size_get (m0_processor_nr_t id)

static size_t	processor_l2_size_get (m0_processor_nr_t id)

static uint32_t	processor_l1_cacheid_get (m0_processor_nr_t id)

static uint32_t	processor_l2_cacheid_get (m0_processor_nr_t id)

static uint32_t	processor_pipelineid_get (m0_processor_nr_t id)

static int	processor_info_get (m0_processor_nr_t id, struct processor_node *pn)

static void	processor_cache_destroy (void)

static int	processors_summary_get ()

static void	processors_m0bitmap_copy (struct m0_bitmap dst, const struct m0_bitmap src)

static int	getcpu_thr_init (struct getcpu_thr_data *data)

static void	getcpu_thr_func (struct getcpu_thr_data *data)

static int	processor_getcpu_check (bool *success)

static int	processor_getcpu_init (void)

static void	processor_getcpu_fini (void)

Variables
static struct processor_sys_summary	sys_cpus

static bool	processor_init = false

Detailed Description

Interfaces to learn the number and characteristics of "processors" for a given system/node.

Definitions

Processor

It's a logical processor. This may mean HT or core inside a physical CPU package. It depends on a given OS kernel. HT is the finest granularity processing unit at hardware level.

Possible-Processors

Maximum number of processors that can be attached to this OS.

Available-Processors

The number of processors that are currently configured or available under this OS. Please note that all the processors may not be enabled or used by OS.

Online-Processors

The number of processors that are currently enabled/under use/online under this OS.

Kernel implementation

This file includes additional data structures and functions for processing processors data - for kernel-mode programs.

This file will also implement Linux kernel-mode processors interfaces.

See also: lib/processor.h

User-space implementation

This file includes additional data structures and function for caching processors data - for user-mode programs.

This file will also implement Linux user-mode processors interfaces.

TestCases

Configuration

Get sysfs file system data for following configurations:

Single CPU
SMP
SMP with multicore CPUs
NUMA
Configurations with Intel, AMD processors
Developer VMs

Procedure

Point the directory for sysfs file system data for the above configurations using environment variable 'M0_PROCESSORS_INFO_DIR'.
Create expected reults file.
Run unit test and compare the processor info structure with expected results.

Macro Definition Documentation

◆ M0_PROCESSORS_INVALID_ID

#define M0_PROCESSORS_INVALID_ID ((uint32_t)-1)

Definition at line 59 of file processor.h.

◆ PROCESSORS_CACHE1_LEVEL_FILE

#define PROCESSORS_CACHE1_LEVEL_FILE "cache/index0/level"

Definition at line 82 of file processor.c.

◆ PROCESSORS_CACHE1_SHCPUMAP_FILE

#define PROCESSORS_CACHE1_SHCPUMAP_FILE "cache/index0/shared_cpu_map"

Definition at line 86 of file processor.c.

◆ PROCESSORS_CACHE1_SIZE_FILE

#define PROCESSORS_CACHE1_SIZE_FILE "cache/index0/size"

Definition at line 90 of file processor.c.

◆ PROCESSORS_CACHE2_LEVEL_FILE

#define PROCESSORS_CACHE2_LEVEL_FILE "cache/index1/level"

Definition at line 83 of file processor.c.

◆ PROCESSORS_CACHE2_SHCPUMAP_FILE

#define PROCESSORS_CACHE2_SHCPUMAP_FILE "cache/index1/shared_cpu_map"

Definition at line 87 of file processor.c.

◆ PROCESSORS_CACHE2_SIZE_FILE

#define PROCESSORS_CACHE2_SIZE_FILE "cache/index1/size"

Definition at line 91 of file processor.c.

◆ PROCESSORS_CACHE3_LEVEL_FILE

#define PROCESSORS_CACHE3_LEVEL_FILE "cache/index2/level"

Definition at line 84 of file processor.c.

◆ PROCESSORS_CACHE3_SHCPUMAP_FILE

#define PROCESSORS_CACHE3_SHCPUMAP_FILE "cache/index2/shared_cpu_map"

Definition at line 88 of file processor.c.

◆ PROCESSORS_CACHE3_SIZE_FILE

#define PROCESSORS_CACHE3_SIZE_FILE "cache/index2/size"

Definition at line 92 of file processor.c.

◆ PROCESSORS_COREID_FILE

#define PROCESSORS_COREID_FILE "topology/core_id"

Definition at line 94 of file processor.c.

◆ PROCESSORS_CPU_DIR

#define PROCESSORS_CPU_DIR "cpu/"

Definition at line 74 of file processor.c.

◆ PROCESSORS_CPU_DIR_PREFIX

#define PROCESSORS_CPU_DIR_PREFIX "cpu/cpu"

Definition at line 97 of file processor.c.

◆ PROCESSORS_CPU_STR

#define PROCESSORS_CPU_STR "cpu"

Definition at line 100 of file processor.c.

◆ PROCESSORS_INFO_ENV

#define PROCESSORS_INFO_ENV "M0_PROCESSORS_INFO_DIR"

Definition at line 71 of file processor.c.

◆ PROCESSORS_MAX_FILE

#define PROCESSORS_MAX_FILE "cpu/kernel_max"

Definition at line 77 of file processor.c.

◆ PROCESSORS_NODE_DIR

#define PROCESSORS_NODE_DIR "node/"

Definition at line 75 of file processor.c.

◆ PROCESSORS_NODE_STR

#define PROCESSORS_NODE_STR "node"

Definition at line 99 of file processor.c.

◆ PROCESSORS_ONLINE_FILE

#define PROCESSORS_ONLINE_FILE "cpu/online"

Definition at line 80 of file processor.c.

◆ PROCESSORS_PHYSID_FILE

#define PROCESSORS_PHYSID_FILE "topology/physical_package_id"

Definition at line 95 of file processor.c.

◆ PROCESSORS_POSS_FILE

#define PROCESSORS_POSS_FILE "cpu/possible"

Definition at line 78 of file processor.c.

◆ PROCESSORS_PRESENT_FILE

#define PROCESSORS_PRESENT_FILE "cpu/present"

Definition at line 79 of file processor.c.

◆ PROCESSORS_SYSFS_DIR

#define PROCESSORS_SYSFS_DIR "/sys/devices/system"

Definition at line 73 of file processor.c.

Typedef Documentation

◆ m0_processor_nr_t

typedef uint32_t m0_processor_nr_t

A processor number/identifier.

Definition at line 62 of file processor.h.

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Enumerator
PROCESSORS_RANGE_SET_SEPARATOR
PROCESSORS_RANGE_SEPARATOR
PROCESSORS_L1
PROCESSORS_L2
MAX_LINE_LEN

Definition at line 102 of file processor.c.

◆ map

enum map

Enumerator
PROCESSORS_POSS_MAP
PROCESSORS_AVAIL_MAP
PROCESSORS_ONLN_MAP

Definition at line 112 of file processor.c.

Function Documentation

◆ getcpu_thr_func()

static void getcpu_thr_func ( struct getcpu_thr_data * data )

static

Definition at line 943 of file processor.c.

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◆ getcpu_thr_init()

static int getcpu_thr_init ( struct getcpu_thr_data * data )

static

Definition at line 938 of file processor.c.

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◆ m0_processor_describe()

M0_INTERNAL int m0_processor_describe	(	m0_processor_nr_t	id,
		struct m0_processor_descr *	pd
	)

Obtain information on the processor with a given id.

Parameters

id	-> id of the processor for which information is requested.
pd	-> processor descripto structure. Memory for this should be allocated by the calling function. Interface does not allocate memory.

Return values

0	if a matching processor is found
-EINVAL	if id does not match with any of the processors or NULL memory pointer for 'pd' is passed.

Precondition: Memory must be allocated for pd. Interface donot allocated memory.; m0_processors_init() must be called before calling this function.

Postcondition: d->pd_id == id or none

Concurrency: This is read only data. Interface by itself does not do any locking. When used in kernel-mode, the interface may call some functions that may use some kind of locks.

Definition at line 1120 of file processor.c.

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◆ m0_processor_id_get()

M0_INTERNAL m0_processor_nr_t m0_processor_id_get ( void )

Return the id of the processor on which the calling thread is running.

Returns: logical processor id (as supplied by the system) on which the calling thread is running, if the call is unsupported. It will return M0_PROCESSORS_INVALID_ID, if this call is not supported.

Definition at line 1139 of file processor.c.

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◆ m0_processor_is_vm()

M0_INTERNAL bool m0_processor_is_vm ( void )

Obtain information on the processor environment by checking the hypervisor feature flag.

Return values

0	if the processor is a physical machine. 1 if the processor is a virtual machine.

Definition at line 1171 of file processor.c.

◆ m0_processor_nr_max()

M0_INTERNAL m0_processor_nr_t m0_processor_nr_max ( void )

Maximum processors this system can handle.

Definition at line 1093 of file processor.c.

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◆ m0_processors_available()

M0_INTERNAL void m0_processors_available ( struct m0_bitmap * map )

Return the bitmap of available processors.

Precondition: map->b_nr >= m0_processor_nr_max(); m0_processors_init() must be called before calling this function.; The calling function must allocate memory for 'map' and initialize it.

Note: This function does not take any locks.

Definition at line 1106 of file processor.c.

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◆ m0_processors_fini()

M0_INTERNAL void m0_processors_fini ( void )

Close the processors interface. This function will destroy any cached data. After calling this interface no meaningful data should be assumed.

Concurrency: Not MT-safe. Assumes no threads are using processor interface.

Definition at line 1084 of file processor.c.

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◆ m0_processors_init()

M0_INTERNAL int m0_processors_init ( void )

Initialize processors interface. This will allow the interface to cache/populate the data, if necessary. The data is cached for user mode. The data may not be cached for kernel mode as kernel already has the data.

The calling function should not assume hot-plug CPU facility. If the underlying OS supports the hot-plug CPU facility, the calling program will have to re-initalize the interface (at least in user-mode) after registering for platform specific CPU change notification.

To re-initalize the interface, m0_processors_fini() must be called first, before initializing it again.

Postcondition: Interface initialized.

Concurrency: The interface should not be initialized twice or simultaneously. It's not MT-safe and can be called only once. It can be called again after calling m0_processors_fini().

Definition at line 1062 of file processor.c.

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◆ m0_processors_online()

M0_INTERNAL void m0_processors_online ( struct m0_bitmap * map )

Return the bitmap of online processors.

Precondition: map->b_nr >= m0_processor_nr_max(); m0_processors_init() must be called before calling this function.; The calling function must allocate memory for 'map' and initialize it.

Note: This function does not take any locks.

Definition at line 1113 of file processor.c.

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◆ m0_processors_possible()

M0_INTERNAL void m0_processors_possible ( struct m0_bitmap * map )

Return the bitmap of possible processors.

Precondition: map->b_nr >= m0_processor_nr_max(); m0_processors_init() must be called before calling this function.; The calling function must allocate memory for 'map' and initialize it.

Note: This function does not take any locks.

Definition at line 1099 of file processor.c.

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◆ number_read()

static uint32_t number_read ( const char * filename )

static

Reads a file. Returns an unsigned number.

Parameters

filename -> file to read

Returns: non-negative number, if successful; M0_PROCESSORS_INVALID_ID, upon failure.

Definition at line 289 of file processor.c.

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◆ processor_cache_destroy()

static void processor_cache_destroy ( void )

static

Cache clean-up.

See also: m0_processors_fini; processors_summary_get

Definition at line 780 of file processor.c.

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◆ processor_coreid_get()

static uint32_t processor_coreid_get ( m0_processor_nr_t id )

static

Read "cpu/cpu<id>/toplology/core_id" file under sysfs. Read the core id string convert it into a number.

Precondition: Assumes the directory has been changed to approriate CPU info dir.

Parameters

id	-> id of the processor for which information is requested.

Returns: "core" id for a given processor, on success. M0_PROCESSORS_INVALID_ID, on failure.

Definition at line 403 of file processor.c.

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◆ processor_getcpu_check()

static int processor_getcpu_check ( bool * success )

static

Checks source of processor id. It runs threads on every online processor and compares processors index with value returned by m0_processor_id_get(). On some systems sched_getcpu() may be broken and return zero on any processor. If it happens the syscall getcpu() is used as workaround.

Parameters

[out] success -> Result of the check.

See also: https://jts.seagate.com/browse/MOTR-2500.

Definition at line 960 of file processor.c.

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◆ processor_getcpu_fini()

static void processor_getcpu_fini ( void )

static

Definition at line 1046 of file processor.c.

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◆ processor_getcpu_init()

static int processor_getcpu_init ( void )

static

Definition at line 1023 of file processor.c.

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◆ processor_info_get()

static int processor_info_get	(	m0_processor_nr_t	id,
		struct processor_node *	pn
	)

static

Collect all the information needed to describe a single processor. This function will scan,parse directories and files under "sysfs". This data is cached.

This function will be called from processors_summary_get().

Parameters

id	-> id of the processor for which information is requested.
pn	-> A linked list node containing processor information.

Precondition: Memory to 'pn' must be allocated by the calling function

Postcondition: pn structure will be filled with processor information

See also: processors_summary_get()

Definition at line 744 of file processor.c.

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◆ processor_is_cache_shared()

static bool processor_is_cache_shared ( const char * mapstr )

static

Read string bitmap and check if the other CPUs share the resource.

Parameters

mapstr -> a string representing a bitmap

Return values

true	if the processor shares the map
false	if the processor does not the map

Definition at line 437 of file processor.c.

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◆ processor_l1_cacheid_get()

static uint32_t processor_l1_cacheid_get ( m0_processor_nr_t id )

static

Fetch L1 cache id for a given processor.

Precondition: Assumes the directory has been changed to approriate CPU info dir.

Parameters

id	-> id of the processor for which information is requested.

Returns: id of L1 cache for the given processor, on success. M0_PROCESSORS_INVALID_ID, on failure.

Definition at line 582 of file processor.c.

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◆ processor_l1_size_get()

static size_t processor_l1_size_get ( m0_processor_nr_t id )

static

Fetch L1 cache size for a given processor.

Precondition: Assumes the directory has been changed to approriate CPU info dir.

Parameters

id	-> id of the processor for which information is requested.

Returns: size of L1 cache for the given processor.

Definition at line 475 of file processor.c.

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◆ processor_l2_cacheid_get()

static uint32_t processor_l2_cacheid_get ( m0_processor_nr_t id )

static

Fetch L2 cache id for a given processor.

Precondition: Assumes the directory has been changed to approriate CPU info dir.

Parameters

id	-> id of the processor for which information is requested.

Returns: id of L2 cache for the given processor, on success. M0_PROCESSORS_INVALID_ID, on failure.

Definition at line 644 of file processor.c.

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◆ processor_l2_size_get()

static size_t processor_l2_size_get ( m0_processor_nr_t id )

static

Fetch L2 cache size for a given processor.

Precondition: Assumes the directory has been changed to approriate CPU info dir.

Parameters

id	-> id of the processor for which information is requested.

Returns: size of L2 cache for the given processor, on success. M0_PROCESSORS_INVALID_ID, on failure.

Definition at line 522 of file processor.c.

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◆ processor_map_set()

static void processor_map_set	(	struct m0_bitmap *	map,
		const char *	mapstr
	)

static

This function converts a bitmap string into a bitmap of m0_bitmap type.

Precondition: map != NULL; mapstr != NULL

Parameters

map	-> m0 bitmap structure that will store the bitmap. Memory for this parameter should be allocated before calling.
mapstr	-> bitmap string

See also: processor_map_type_set()

Definition at line 193 of file processor.c.

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◆ processor_map_type_set()

static int processor_map_type_set ( enum map map_type )

static

Read map files under sysfs. Read the present cpu string and convert it into a bitmap.

Precondition: Assumes the directory has been changed to approriate CPU info dir.

See also: processor_map_set()

Definition at line 235 of file processor.c.

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◆ processor_maxsz_get()

static void processor_maxsz_get ( )

static

Read "cpu/kernel_max" file under sysfs. Read the kernel_max cpu string and convert it into a number.

Precondition: Assumes the directory has been changed to approriate CPU info dir.

See also: processor_map_set(); processor_map_type_set()

Definition at line 315 of file processor.c.

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◆ processor_numanodeid_get()

static uint32_t processor_numanodeid_get ( m0_processor_nr_t id )

static

Fetch NUMA node id for a given processor.

Precondition: Assumes the directory has been changed to approriate CPU info dir.

Parameters

id	-> id of the processor for which information is requested.

Returns: id of the NUMA node to which the processor belongs. If the machine is not configured as NUMA, returns 0.

Definition at line 332 of file processor.c.

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◆ processor_physid_get()

static uint32_t processor_physid_get ( m0_processor_nr_t id )

static

Read "cpu/cpu<id>/toplology/physical_package_id" file under sysfs. Read the physical package id string convert it into a number.

Precondition: Assumes the directory has been changed to approriate CPU info dir.

Parameters

id	-> id of the processor for which information is requested.

Returns: "phys" id for a given processor, on success. M0_PROCESSORS_INVALID_ID, on failure.

Definition at line 421 of file processor.c.

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◆ processor_pipelineid_get()

static uint32_t processor_pipelineid_get ( m0_processor_nr_t id )

inlinestatic

Fetch pipeline id for a given processor. Curently pipeline id is same as processor id.

Parameters

id	-> id of the processor for which information is requested.

Returns: id of pipeline for the given processor.

Definition at line 724 of file processor.c.

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◆ processors_m0bitmap_copy()

static void processors_m0bitmap_copy	(	struct m0_bitmap *	dst,
		const struct m0_bitmap *	src
	)

static

Copy m0_bitmap.

Parameters

dst	-> Destination bitmap
src	-> Source bitmap.

Definition at line 931 of file processor.c.

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◆ processors_summary_get()

static int processors_summary_get ( )

static

Parse "sysfs" (/sys/devices/system) directory to fetch the summary of processors on this system.

To facilitate testing, this function will fetch the directory string from environment variable M0_PROCESSORS_INFO_DIR. This environment variable should be used only for unit testing. Under normal operation, a default value of "sysfs" directory is used.

Precondition: M0_PROCESSORS_INFO_DIR/default directory must exist.

Postcondition: A global variable of type processor_sys_summary will be filled in

See also: lib/processor.h; void m0_processors_init()

Definition at line 816 of file processor.c.

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Variable Documentation

◆ processor_init

bool processor_init = false

static

Definition at line 180 of file processor.c.

◆ sys_cpus

struct processor_sys_summary sys_cpus

static

Definition at line 179 of file processor.c.

Data Structures

Macros

Typedefs

Enumerations

Functions

Variables

Detailed Description

Definitions

Processor

Possible-Processors

Available-Processors

Online-Processors

Kernel implementation

User-space implementation

TestCases

Configuration

Procedure

Macro Definition Documentation

◆ M0_PROCESSORS_INVALID_ID

◆ PROCESSORS_CACHE1_LEVEL_FILE

◆ PROCESSORS_CACHE1_SHCPUMAP_FILE

◆ PROCESSORS_CACHE1_SIZE_FILE

◆ PROCESSORS_CACHE2_LEVEL_FILE

◆ PROCESSORS_CACHE2_SHCPUMAP_FILE

◆ PROCESSORS_CACHE2_SIZE_FILE

◆ PROCESSORS_CACHE3_LEVEL_FILE

◆ PROCESSORS_CACHE3_SHCPUMAP_FILE

◆ PROCESSORS_CACHE3_SIZE_FILE

◆ PROCESSORS_COREID_FILE

◆ PROCESSORS_CPU_DIR

◆ PROCESSORS_CPU_DIR_PREFIX

◆ PROCESSORS_CPU_STR

◆ PROCESSORS_INFO_ENV

◆ PROCESSORS_MAX_FILE

◆ PROCESSORS_NODE_DIR

◆ PROCESSORS_NODE_STR

◆ PROCESSORS_ONLINE_FILE

◆ PROCESSORS_PHYSID_FILE

◆ PROCESSORS_POSS_FILE

◆ PROCESSORS_PRESENT_FILE

◆ PROCESSORS_SYSFS_DIR

Typedef Documentation

◆ m0_processor_nr_t

Enumeration Type Documentation

◆ anonymous enum

◆ map

Function Documentation

◆ getcpu_thr_func()

◆ getcpu_thr_init()

◆ m0_processor_describe()

◆ m0_processor_id_get()

◆ m0_processor_is_vm()

◆ m0_processor_nr_max()

◆ m0_processors_available()

◆ m0_processors_fini()

◆ m0_processors_init()

◆ m0_processors_online()

◆ m0_processors_possible()

◆ number_read()

◆ processor_cache_destroy()

◆ processor_coreid_get()

◆ processor_getcpu_check()

◆ processor_getcpu_fini()

◆ processor_getcpu_init()

◆ processor_info_get()

◆ processor_is_cache_shared()

◆ processor_l1_cacheid_get()

◆ processor_l1_size_get()

◆ processor_l2_cacheid_get()

◆ processor_l2_size_get()

◆ processor_map_set()

◆ processor_map_type_set()

◆ processor_maxsz_get()

◆ processor_numanodeid_get()

◆ processor_physid_get()

◆ processor_pipelineid_get()

◆ processors_m0bitmap_copy()

◆ processors_summary_get()

Variable Documentation

◆ processor_init