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/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* counter.h: simple and packet/byte counters
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef included_vlib_counter_h
#define included_vlib_counter_h
#include <vlib/counter_types.h>
/** \file
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.
*/
/** A collection of simple counters */
typedef struct
{
counter_t **counters; /**< Per-thread u64 non-atomic counters */
counter_t *value_at_last_serialize; /**< Values as of last serialize. */
u32 last_incremental_serialize_index; /**< Last counter index
serialized incrementally. */
char *name; /**< The counter collection's name. */
char *stat_segment_name; /**< Name in stat segment directory */
} vlib_simple_counter_main_t;
/** The number of counters (not the number of per-thread counters) */
u32 vlib_simple_counter_n_counters (const vlib_simple_counter_main_t * cm);
/** Increment a simple counter
@param cm - (vlib_simple_counter_main_t *) simple counter main pointer
@param thread_index - (u32) the current cpu index
@param index - (u32) index of the counter to increment
@param increment - (u64) quantitiy to add to the counter
*/
always_inline void
vlib_increment_simple_counter (vlib_simple_counter_main_t * cm,
u32 thread_index, u32 index, u64 increment)
{
counter_t *my_counters;
my_counters = cm->counters[thread_index];
my_counters[index] += increment;
}
/** Set a simple counter
@param cm - (vlib_simple_counter_main_t *) simple counter main pointer
@param thread_index - (u32) the current cpu index
@param index - (u32) index of the counter to increment
@param value - (u64) quantitiy to set to the counter
*/
always_inline void
vlib_set_simple_counter (vlib_simple_counter_main_t * cm,
u32 thread_index, u32 index, u64 value)
{
counter_t *my_counters;
my_counters = cm->counters[thread_index];
my_counters[index] = value;
}
/** 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
@param cm - (vlib_simple_counter_main_t *) simple counter main pointer
@param index - (u32) index of the counter to fetch
@returns - (u64) current counter value
*/
always_inline counter_t
vlib_get_simple_counter (vlib_simple_counter_main_t * cm, u32 index)
{
counter_t *my_counters;
counter_t v;
int i;
ASSERT (index < vlib_simple_counter_n_counters (cm));
v = 0;
for (i = 0; i < vec_len (cm->counters); i++)
{
my_counters = cm->counters[i];
v += my_counters[index];
}
return v;
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