counter.h File Reference

Optimized thread-safe counters. More...

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Data Structures
struct	vlib_simple_counter_main_t
	A collection of simple counters. More...
struct	vlib_counter_t
	Combined counter to hold both packets and byte differences. More...
struct	vlib_combined_counter_main_t
	A collection of combined counters. More...

Macros
#define	vlib_counter_len(cm)   vec_len((cm)->maxi)
	Obtain the number of simple or combined counters allocated. More...

Typedefs
typedef u64	counter_t
	64bit counters More...

Functions
u32	vlib_simple_counter_n_counters (const vlib_simple_counter_main_t *cm)
	The number of counters (not the number of per-thread counters) More...
static void	vlib_increment_simple_counter (vlib_simple_counter_main_t *cm, u32 thread_index, u32 index, u64 increment)
	Increment a simple counter. More...
static counter_t	vlib_get_simple_counter (vlib_simple_counter_main_t *cm, u32 index)
	Get the value of a simple counter Scrapes the entire set of per-thread counters. More...
static void	vlib_zero_simple_counter (vlib_simple_counter_main_t *cm, u32 index)
	Clear a simple counter Clears the set of per-thread u16 counters, and the u64 counter. More...
static void	vlib_counter_add (vlib_counter_t *a, vlib_counter_t *b)
	Add two combined counters, results in the first counter. More...
static void	vlib_counter_sub (vlib_counter_t *a, vlib_counter_t *b)
	Subtract combined counters, results in the first counter. More...
static void	vlib_counter_zero (vlib_counter_t *a)
	Clear a combined counter. More...
u32	vlib_combined_counter_n_counters (const vlib_combined_counter_main_t *cm)
	The number of counters (not the number of per-thread counters) More...
void	vlib_clear_simple_counters (vlib_simple_counter_main_t *cm)
	Clear a collection of simple counters. More...
void	vlib_clear_combined_counters (vlib_combined_counter_main_t *cm)
	Clear a collection of combined counters. More...
static void	vlib_increment_combined_counter (vlib_combined_counter_main_t *cm, u32 thread_index, u32 index, u64 n_packets, u64 n_bytes)
	Increment a combined counter. More...
static void	vlib_prefetch_combined_counter (const vlib_combined_counter_main_t *cm, u32 thread_index, u32 index)
	Pre-fetch a per-thread combined counter for the given object index. More...
static void	vlib_get_combined_counter (const vlib_combined_counter_main_t *cm, u32 index, vlib_counter_t *result)
	Get the value of a combined counter, never called in the speed path Scrapes the entire set of per-thread counters. More...
static void	vlib_zero_combined_counter (vlib_combined_counter_main_t *cm, u32 index)
	Clear a combined counter Clears the set of per-thread counters. More...
void	vlib_validate_simple_counter (vlib_simple_counter_main_t *cm, u32 index)
	validate a simple counter More...
void	vlib_validate_combined_counter (vlib_combined_counter_main_t *cm, u32 index)
	validate a combined counter More...

Variables
serialize_function_t	serialize_vlib_simple_counter_main
serialize_function_t	unserialize_vlib_simple_counter_main
serialize_function_t	serialize_vlib_combined_counter_main
serialize_function_t	unserialize_vlib_combined_counter_main

Detailed Description

Optimized thread-safe counters.

Each vlib_[simple|combined]_counter_main_t consists of a per-thread vector of per-object counters.

The idea is to drastically eliminate atomic operations.

Definition in file counter.h.

Macro Definition Documentation

#define vlib_counter_len

(

cm

)

vec_len((cm)->maxi)

Obtain the number of simple or combined counters allocated.

A macro which reduces to to vec_len(cm->maxi), the answer in either case.

Parameters

cm	- (vlib_simple_counter_main_t) or (vlib_combined_counter_main_t) the counter collection to interrogate

Returns

vec_len(cm->maxi)

Definition at line 315 of file counter.h.

Typedef Documentation

typedef u64 counter_t

64bit counters

Definition at line 54 of file counter.h.

Function Documentation

void vlib_clear_combined_counters

(

vlib_combined_counter_main_t *

cm

)

Clear a collection of combined counters.

Parameters

cm	- (vlib_combined_counter_main_t *) collection to clear

Definition at line 60 of file counter.c.

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void vlib_clear_simple_counters

(

vlib_simple_counter_main_t *

cm

)

Clear a collection of simple counters.

Parameters

cm	- (vlib_simple_counter_main_t *) collection to clear

Definition at line 43 of file counter.c.

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u32 vlib_combined_counter_n_counters

(

const vlib_combined_counter_main_t *

cm

)

The number of counters (not the number of per-thread counters)

Definition at line 100 of file counter.c.

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static void vlib_counter_add ( vlib_counter_t *  a, vlib_counter_t *  b  )

inlinestatic

Add two combined counters, results in the first counter.

Parameters

[in,out]	a	- (vlib_counter_t *) dst counter
	b	- (vlib_counter_t *) src counter

Definition at line 151 of file counter.h.

static void vlib_counter_sub ( vlib_counter_t *  a, vlib_counter_t *  b  )

inlinestatic

Subtract combined counters, results in the first counter.

Parameters

[in,out]	a	- (vlib_counter_t *) dst counter
	b	- (vlib_counter_t *) src counter

Definition at line 162 of file counter.h.

static void vlib_counter_zero ( vlib_counter_t *  a )

inlinestatic

Clear a combined counter.

Parameters

a	- (vlib_counter_t *) counter to clear

Definition at line 174 of file counter.h.

static void vlib_get_combined_counter ( const vlib_combined_counter_main_t *  cm, u32  index, vlib_counter_t *  result  )

inlinestatic

Get the value of a combined counter, never called in the speed path Scrapes the entire set of per-thread counters.

Innacurate unless worker threads which might increment the counter are barrier-synchronized

Parameters

cm	- (vlib_combined_counter_main_t *) combined counter main pointer
index	- (u32) index of the combined counter to fetch
result	[out] - (vlib_counter_t *) result stored here

Definition at line 250 of file counter.h.

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static counter_t vlib_get_simple_counter ( vlib_simple_counter_main_t *  cm, u32  index  )

inlinestatic

Get the value of a simple counter Scrapes the entire set of per-thread counters.

Innacurate unless worker threads which might increment the counter are barrier-synchronized

Parameters

cm	- (vlib_simple_counter_main_t *) simple counter main pointer
index	- (u32) index of the counter to fetch

Returns

- (u64) current counter value

Definition at line 97 of file counter.h.

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static void vlib_increment_combined_counter ( vlib_combined_counter_main_t *  cm, u32  thread_index, u32  index, u64  n_packets, u64  n_bytes  )

inlinestatic

Increment a combined counter.

Parameters

cm	- (vlib_combined_counter_main_t *) comined counter main pointer
thread_index	- (u32) the current cpu index
index	- (u32) index of the counter to increment
packet_increment	- (u64) number of packets to add to the counter
byte_increment	- (u64) number of bytes to add to the counter

Definition at line 211 of file counter.h.

static void vlib_increment_simple_counter ( vlib_simple_counter_main_t *  cm, u32  thread_index, u32  index, u64  increment  )

inlinestatic

Increment a simple counter.

Parameters

cm	- (vlib_simple_counter_main_t *) simple counter main pointer
thread_index	- (u32) the current cpu index
index	- (u32) index of the counter to increment
increment	- (u64) quantitiy to add to the counter

Definition at line 78 of file counter.h.

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static void vlib_prefetch_combined_counter ( const vlib_combined_counter_main_t *  cm, u32  thread_index, u32  index  )

inlinestatic

Pre-fetch a per-thread combined counter for the given object index.

Definition at line 226 of file counter.h.

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u32 vlib_simple_counter_n_counters

(

const vlib_simple_counter_main_t *

cm

)

The number of counters (not the number of per-thread counters)

Definition at line 107 of file counter.c.

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void vlib_validate_combined_counter	(	vlib_combined_counter_main_t *	cm,
		u32	index
	)

validate a combined counter

Parameters

cm	- (vlib_combined_counter_main_t *) pointer to the counter collection
index	- (u32) index of the counter to validate

Definition at line 89 of file counter.c.

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void vlib_validate_simple_counter	(	vlib_simple_counter_main_t *	cm,
		u32	index
	)

validate a simple counter

Parameters

cm	- (vlib_simple_counter_main_t *) pointer to the counter collection
index	- (u32) index of the counter to validate

Definition at line 78 of file counter.c.

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static void vlib_zero_combined_counter ( vlib_combined_counter_main_t *  cm, u32  index  )

inlinestatic

Clear a combined counter Clears the set of per-thread counters.

Parameters

cm	- (vlib_combined_counter_main_t *) combined counter main pointer
index	- (u32) index of the counter to clear

Definition at line 276 of file counter.h.

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static void vlib_zero_simple_counter ( vlib_simple_counter_main_t *  cm, u32  index  )

inlinestatic

Clear a simple counter Clears the set of per-thread u16 counters, and the u64 counter.

Parameters

cm	- (vlib_simple_counter_main_t *) simple counter main pointer
index	- (u32) index of the counter to clear

Definition at line 123 of file counter.h.

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Variable Documentation

serialize_function_t serialize_vlib_combined_counter_main

Definition at line 319 of file counter.h.

serialize_function_t serialize_vlib_simple_counter_main

Definition at line 317 of file counter.h.

serialize_function_t unserialize_vlib_combined_counter_main

Definition at line 319 of file counter.h.

serialize_function_t unserialize_vlib_simple_counter_main

Definition at line 317 of file counter.h.