mirror of
https://github.com/opnsense/src.git
synced 2026-04-01 15:35:10 -04:00
8363672729
It takes the lock and release it immediately to make sure no shrinkers are running in parallel. Reviewed by: manu Approved by: manu Differential Revision: https://reviews.freebsd.org/D38565
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*-
|
|
* Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
|
|
*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/sx.h>
|
|
|
|
#include <linux/compat.h>
|
|
#include <linux/shrinker.h>
|
|
|
|
TAILQ_HEAD(, shrinker) lkpi_shrinkers = TAILQ_HEAD_INITIALIZER(lkpi_shrinkers);
|
|
static struct sx sx_shrinker;
|
|
|
|
int
|
|
linuxkpi_register_shrinker(struct shrinker *s)
|
|
{
|
|
|
|
KASSERT(s != NULL, ("NULL shrinker"));
|
|
KASSERT(s->count_objects != NULL, ("NULL shrinker"));
|
|
KASSERT(s->scan_objects != NULL, ("NULL shrinker"));
|
|
sx_xlock(&sx_shrinker);
|
|
TAILQ_INSERT_TAIL(&lkpi_shrinkers, s, next);
|
|
sx_xunlock(&sx_shrinker);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
linuxkpi_unregister_shrinker(struct shrinker *s)
|
|
{
|
|
|
|
sx_xlock(&sx_shrinker);
|
|
TAILQ_REMOVE(&lkpi_shrinkers, s, next);
|
|
sx_xunlock(&sx_shrinker);
|
|
}
|
|
|
|
void
|
|
linuxkpi_synchronize_shrinkers(void)
|
|
{
|
|
|
|
sx_xlock(&sx_shrinker);
|
|
sx_xunlock(&sx_shrinker);
|
|
}
|
|
|
|
#define SHRINKER_BATCH 512
|
|
|
|
static void
|
|
shrinker_shrink(struct shrinker *s)
|
|
{
|
|
struct shrink_control sc;
|
|
unsigned long can_free;
|
|
unsigned long batch;
|
|
unsigned long scanned = 0;
|
|
unsigned long ret;
|
|
|
|
can_free = s->count_objects(s, &sc);
|
|
if (can_free <= 0)
|
|
return;
|
|
|
|
batch = s->batch ? s->batch : SHRINKER_BATCH;
|
|
while (scanned <= can_free) {
|
|
sc.nr_to_scan = batch;
|
|
ret = s->scan_objects(s, &sc);
|
|
if (ret == SHRINK_STOP)
|
|
break;
|
|
scanned += batch;
|
|
}
|
|
}
|
|
|
|
static void
|
|
linuxkpi_vm_lowmem(void *arg __unused)
|
|
{
|
|
struct shrinker *s;
|
|
|
|
sx_xlock(&sx_shrinker);
|
|
TAILQ_FOREACH(s, &lkpi_shrinkers, next) {
|
|
shrinker_shrink(s);
|
|
}
|
|
sx_xunlock(&sx_shrinker);
|
|
}
|
|
|
|
static eventhandler_tag lowmem_tag;
|
|
|
|
static void
|
|
linuxkpi_sysinit_shrinker(void *arg __unused)
|
|
{
|
|
|
|
sx_init(&sx_shrinker, "lkpi-shrinker");
|
|
lowmem_tag = EVENTHANDLER_REGISTER(vm_lowmem, linuxkpi_vm_lowmem,
|
|
NULL, EVENTHANDLER_PRI_FIRST);
|
|
}
|
|
|
|
static void
|
|
linuxkpi_sysuninit_shrinker(void *arg __unused)
|
|
{
|
|
|
|
sx_destroy(&sx_shrinker);
|
|
EVENTHANDLER_DEREGISTER(vm_lowmem, lowmem_tag);
|
|
}
|
|
|
|
SYSINIT(linuxkpi_shrinker, SI_SUB_DRIVERS, SI_ORDER_ANY,
|
|
linuxkpi_sysinit_shrinker, NULL);
|
|
SYSUNINIT(linuxkpi_shrinker, SI_SUB_DRIVERS, SI_ORDER_ANY,
|
|
linuxkpi_sysuninit_shrinker, NULL);
|