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2fe9ea5d3a
This fixes following warnings when shrinkers are invoked first time: uma_zalloc_debug: zone "lkpicurr" with the following non-sleepable locks held: exclusive sleep mutex lkpi-shrinker (lkpi-shrinker) uma_zalloc_debug: zone "lkpimm" with the following non-sleepable locks held: exclusive sleep mutex lkpi-shrinker (lkpi-shrinker) Reviewed by: hselasky, manu MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D32066
127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
/*-
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* Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/queue.h>
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#include <sys/eventhandler.h>
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#include <sys/mutex.h>
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#include <linux/compat.h>
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#include <linux/shrinker.h>
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TAILQ_HEAD(, shrinker) lkpi_shrinkers = TAILQ_HEAD_INITIALIZER(lkpi_shrinkers);
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static struct mtx mtx_shrinker;
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int
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linuxkpi_register_shrinker(struct shrinker *s)
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{
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KASSERT(s != NULL, ("NULL shrinker"));
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KASSERT(s->count_objects != NULL, ("NULL shrinker"));
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KASSERT(s->scan_objects != NULL, ("NULL shrinker"));
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mtx_lock(&mtx_shrinker);
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TAILQ_INSERT_TAIL(&lkpi_shrinkers, s, next);
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mtx_unlock(&mtx_shrinker);
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return (0);
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}
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void
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linuxkpi_unregister_shrinker(struct shrinker *s)
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{
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mtx_lock(&mtx_shrinker);
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TAILQ_REMOVE(&lkpi_shrinkers, s, next);
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mtx_unlock(&mtx_shrinker);
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}
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#define SHRINKER_BATCH 512
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static void
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shrinker_shrink(struct shrinker *s)
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{
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struct shrink_control sc;
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unsigned long can_free;
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unsigned long batch;
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unsigned long scanned = 0;
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unsigned long ret;
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can_free = s->count_objects(s, &sc);
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if (can_free <= 0)
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return;
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batch = s->batch ? s->batch : SHRINKER_BATCH;
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while (scanned <= can_free) {
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sc.nr_to_scan = batch;
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ret = s->scan_objects(s, &sc);
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if (ret == SHRINK_STOP)
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break;
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scanned += batch;
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}
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}
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static void
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linuxkpi_vm_lowmem(void *arg __unused)
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{
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struct shrinker *s;
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linux_set_current(curthread);
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mtx_lock(&mtx_shrinker);
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TAILQ_FOREACH(s, &lkpi_shrinkers, next) {
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shrinker_shrink(s);
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}
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mtx_unlock(&mtx_shrinker);
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}
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static eventhandler_tag lowmem_tag;
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static void
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linuxkpi_sysinit_shrinker(void *arg __unused)
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{
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mtx_init(&mtx_shrinker, "lkpi-shrinker", NULL, MTX_DEF);
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lowmem_tag = EVENTHANDLER_REGISTER(vm_lowmem, linuxkpi_vm_lowmem,
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NULL, EVENTHANDLER_PRI_FIRST);
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}
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static void
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linuxkpi_sysuninit_shrinker(void *arg __unused)
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{
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mtx_destroy(&mtx_shrinker);
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EVENTHANDLER_DEREGISTER(vm_lowmem, lowmem_tag);
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}
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SYSINIT(linuxkpi_shrinker, SI_SUB_DRIVERS, SI_ORDER_ANY,
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linuxkpi_sysinit_shrinker, NULL);
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SYSUNINIT(linuxkpi_shrinker, SI_SUB_DRIVERS, SI_ORDER_ANY,
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linuxkpi_sysuninit_shrinker, NULL);
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