81a34d374e
The method was called for two different conditions: 1) the VM layer is low on pages or 2) one of UMA zones of mbuf allocator exhausted. This change 2) into a new event handler, but all affected network subsystems modified to subscribe to both, so this change shall not bring functional changes under different low memory situations. There were three subsystems still using pr_drain: TCP, SCTP and frag6. The latter had its protosw entry for the only reason to register its pr_drain method. Reviewed by: tuexen, melifaro Differential revision: https://reviews.freebsd.org/D36164
115 lines
3.7 KiB
C
115 lines
3.7 KiB
C
/*-
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* SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from: @(#)vm_pageout.h 8.2 (Berkeley) 1/12/94
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Avadis Tevanian, Jr.
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $FreeBSD$
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*/
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#ifndef _VM_VM_PAGEOUT_H_
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#define _VM_VM_PAGEOUT_H_
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#ifdef _KERNEL
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/*
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* Header file for pageout daemon.
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*/
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/*
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* Exported data structures.
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*/
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extern u_long vm_page_max_user_wired;
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extern int vm_pageout_page_count;
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#define VM_OOM_MEM 1
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#define VM_OOM_MEM_PF 2
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#define VM_OOM_SWAPZ 3
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/*
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* vm_lowmem flags.
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*/
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#define VM_LOW_KMEM 0x01
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#define VM_LOW_PAGES 0x02
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#define VM_LOW_MBUFS 0x04
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/*
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* Exported routines.
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*/
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/*
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* Signal pageout-daemon and wait for it.
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*/
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void vm_wait(vm_object_t obj);
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int vm_wait_intr(vm_object_t obj);
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void vm_waitpfault(struct domainset *, int timo);
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void vm_wait_domain(int domain);
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void vm_wait_min(void);
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void vm_wait_severe(void);
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int vm_pageout_flush(vm_page_t *, int, int, int, int *, boolean_t *);
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void vm_pageout_oom(int shortage);
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void vm_swapout_run(void);
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void vm_swapout_run_idle(void);
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#endif /* _KERNEL */
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#endif /* _VM_VM_PAGEOUT_H_ */
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