blob: ce6a81b5fd305531c7730b109276234fec7e5c3d [file] [log] [blame]
/*
* include/proto/activity.h
* This file contains macros and inline functions for activity measurements.
*
* Copyright (C) 2000-2018 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _PROTO_ACTIVITY_H
#define _PROTO_ACTIVITY_H
#include <haproxy/atomic.h>
#include <haproxy/api.h>
#include <haproxy/time.h>
#include <types/activity.h>
#include <haproxy/freq_ctr.h>
/* bit fields for "profiling" */
#define HA_PROF_TASKS_OFF 0x00000000 /* per-task CPU profiling forced disabled */
#define HA_PROF_TASKS_AUTO 0x00000001 /* per-task CPU profiling automatic */
#define HA_PROF_TASKS_ON 0x00000002 /* per-task CPU profiling forced enabled */
#define HA_PROF_TASKS_MASK 0x00000003 /* per-task CPU profiling mask */
extern unsigned int profiling;
extern unsigned long task_profiling_mask;
extern struct activity activity[MAX_THREADS];
void report_stolen_time(uint64_t stolen);
/* Collect date and time information before calling poll(). This will be used
* to count the run time of the past loop and the sleep time of the next poll.
* It also makes use of the just updated before_poll timer to count the loop's
* run time and feed the average loop time metric (in microseconds).
*/
static inline void activity_count_runtime()
{
uint64_t new_mono_time;
uint64_t new_cpu_time;
int64_t stolen;
uint32_t run_time;
uint32_t up, down;
/* 1 millisecond per loop on average over last 1024 iterations is
* enough to turn on profiling.
*/
up = 1000;
down = up * 99 / 100;
new_cpu_time = now_cpu_time();
new_mono_time = now_mono_time();
if (ti->prev_cpu_time && ti->prev_mono_time) {
new_cpu_time -= ti->prev_cpu_time;
new_mono_time -= ti->prev_mono_time;
stolen = new_mono_time - new_cpu_time;
if (unlikely(stolen >= 500000)) {
stolen /= 500000;
/* more than half a millisecond difference might
* indicate an undesired preemption.
*/
report_stolen_time(stolen);
}
}
run_time = (before_poll.tv_sec - after_poll.tv_sec) * 1000000U + (before_poll.tv_usec - after_poll.tv_usec);
swrate_add(&activity[tid].avg_loop_us, TIME_STATS_SAMPLES, run_time);
/* reaching the "up" threshold on average switches profiling to "on"
* when automatic, and going back below the "down" threshold switches
* to off.
*/
if (!(task_profiling_mask & tid_bit)) {
if (unlikely((profiling & HA_PROF_TASKS_MASK) == HA_PROF_TASKS_ON ||
((profiling & HA_PROF_TASKS_MASK) == HA_PROF_TASKS_AUTO && run_time >= up))) {
if (swrate_avg(activity[tid].avg_loop_us, TIME_STATS_SAMPLES) >= up)
_HA_ATOMIC_OR(&task_profiling_mask, tid_bit);
}
} else {
if (unlikely((profiling & HA_PROF_TASKS_MASK) == HA_PROF_TASKS_OFF ||
((profiling & HA_PROF_TASKS_MASK) == HA_PROF_TASKS_AUTO && run_time <= down))) {
if (swrate_avg(activity[tid].avg_loop_us, TIME_STATS_SAMPLES) <= down)
_HA_ATOMIC_AND(&task_profiling_mask, ~tid_bit);
}
}
}
#endif /* _PROTO_ACTIVITY_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/