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_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...

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 void	vlib_set_simple_counter (vlib_simple_counter_main_t *cm, u32 thread_index, u32 index, u64 value)
	Set 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...

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

vlib_counter_len

#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 324 of file counter.h.

Function Documentation

vlib_clear_combined_counters()

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 61 of file counter.c.

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vlib_clear_simple_counters()

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 44 of file counter.c.

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vlib_combined_counter_n_counters()

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 109 of file counter.c.

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vlib_counter_add()

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 159 of file counter.h.

vlib_counter_sub()

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 170 of file counter.h.

vlib_counter_zero()

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 182 of file counter.h.

vlib_get_combined_counter()

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 259 of file counter.h.

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vlib_get_simple_counter()

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 113 of file counter.h.

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vlib_increment_combined_counter()

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 220 of file counter.h.

vlib_increment_simple_counter()

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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vlib_prefetch_combined_counter()

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 235 of file counter.h.

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vlib_set_simple_counter()

static void vlib_set_simple_counter ( vlib_simple_counter_main_t *  cm, u32  thread_index, u32  index, u64  value  )

inlinestatic

Set 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
value	- (u64) quantitiy to set to the counter

Definition at line 94 of file counter.h.

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vlib_simple_counter_n_counters()

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 116 of file counter.c.

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vlib_validate_combined_counter()

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 94 of file counter.c.

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vlib_validate_simple_counter()

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 79 of file counter.c.

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vlib_zero_combined_counter()

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 285 of file counter.h.

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vlib_zero_simple_counter()

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 139 of file counter.h.

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