176 lines
4.2 KiB
C
176 lines
4.2 KiB
C
/*-
|
|
* Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/sched.h>
|
|
#include <sys/smp.h>
|
|
#include <sys/sysctl.h>
|
|
#include <vm/uma.h>
|
|
|
|
#define IN_SUBR_COUNTER_C
|
|
#include <sys/counter.h>
|
|
|
|
void
|
|
counter_u64_zero(counter_u64_t c)
|
|
{
|
|
|
|
counter_u64_zero_inline(c);
|
|
}
|
|
|
|
uint64_t
|
|
counter_u64_fetch(counter_u64_t c)
|
|
{
|
|
|
|
return (counter_u64_fetch_inline(c));
|
|
}
|
|
|
|
counter_u64_t
|
|
counter_u64_alloc(int flags)
|
|
{
|
|
counter_u64_t r;
|
|
|
|
r = uma_zalloc(pcpu_zone_64, flags);
|
|
if (r != NULL)
|
|
counter_u64_zero(r);
|
|
|
|
return (r);
|
|
}
|
|
|
|
void
|
|
counter_u64_free(counter_u64_t c)
|
|
{
|
|
|
|
uma_zfree(pcpu_zone_64, c);
|
|
}
|
|
|
|
int
|
|
sysctl_handle_counter_u64(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
uint64_t out;
|
|
int error;
|
|
|
|
out = counter_u64_fetch(*(counter_u64_t *)arg1);
|
|
|
|
error = SYSCTL_OUT(req, &out, sizeof(uint64_t));
|
|
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
|
|
/*
|
|
* Any write attempt to a counter zeroes it.
|
|
*/
|
|
counter_u64_zero(*(counter_u64_t *)arg1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
sysctl_handle_counter_u64_array(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
uint64_t *out;
|
|
int error;
|
|
|
|
out = malloc(arg2 * sizeof(uint64_t), M_TEMP, M_WAITOK);
|
|
for (int i = 0; i < arg2; i++)
|
|
out[i] = counter_u64_fetch(((counter_u64_t *)arg1)[i]);
|
|
|
|
error = SYSCTL_OUT(req, out, arg2 * sizeof(uint64_t));
|
|
free(out, M_TEMP);
|
|
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
|
|
/*
|
|
* Any write attempt to a counter zeroes it.
|
|
*/
|
|
for (int i = 0; i < arg2; i++)
|
|
counter_u64_zero(((counter_u64_t *)arg1)[i]);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* MP-friendly version of ppsratecheck().
|
|
*
|
|
* Returns non-negative if we are in the rate, negative otherwise.
|
|
* 0 - rate limit not reached.
|
|
* -1 - rate limit reached.
|
|
* >0 - rate limit was reached before, and was just reset. The return value
|
|
* is number of events since last reset.
|
|
*/
|
|
int64_t
|
|
counter_ratecheck(struct counter_rate *cr, int64_t limit)
|
|
{
|
|
int64_t val;
|
|
int now;
|
|
|
|
val = cr->cr_over;
|
|
now = ticks;
|
|
|
|
if (now - cr->cr_ticks >= hz) {
|
|
/*
|
|
* Time to clear the structure, we are in the next second.
|
|
* First try unlocked read, and then proceed with atomic.
|
|
*/
|
|
if ((cr->cr_lock == 0) &&
|
|
atomic_cmpset_acq_int(&cr->cr_lock, 0, 1)) {
|
|
/*
|
|
* Check if other thread has just went through the
|
|
* reset sequence before us.
|
|
*/
|
|
if (now - cr->cr_ticks >= hz) {
|
|
val = counter_u64_fetch(cr->cr_rate);
|
|
counter_u64_zero(cr->cr_rate);
|
|
cr->cr_over = 0;
|
|
cr->cr_ticks = now;
|
|
}
|
|
atomic_store_rel_int(&cr->cr_lock, 0);
|
|
} else
|
|
/*
|
|
* We failed to lock, in this case other thread may
|
|
* be running counter_u64_zero(), so it is not safe
|
|
* to do an update, we skip it.
|
|
*/
|
|
return (val);
|
|
}
|
|
|
|
counter_u64_add(cr->cr_rate, 1);
|
|
if (cr->cr_over != 0)
|
|
return (-1);
|
|
if (counter_u64_fetch(cr->cr_rate) > limit)
|
|
val = cr->cr_over = -1;
|
|
|
|
return (val);
|
|
}
|