f82dd310bb
According to markj@: pageproc contains the page daemon and laundry threads, which are responsible for managing the LRU page queues and writing back dirty pages. vmproc's main task is to swap out kernel stacks when the system is under memory pressure, and swap them back in when necessary. It's a somewhat legacy component of the system and isn't required. You can build a kernel without it by specifying "options NO_SWAPPING" (which is a somewhat misleading name), in which vm_swapout_dummy.c is compiled instead of vm_swapout.c. Based on this, we want pageproc to emulate kswapd, not vmproc. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D18061
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/*-
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* Copyright (c) 2018 Intel Corporation
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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 are
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* 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
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* the documentation and/or other materials provided with the
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* 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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#ifndef _LINUX_SWAP_H_
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#define _LINUX_SWAP_H_
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#include <vm/swap_pager.h>
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#include <vm/vm_pageout.h>
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static inline long
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get_nr_swap_pages(void)
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{
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int i, j;
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/* NB: This could be done cheaply by obtaining swap_total directly */
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swap_pager_status(&i, &j);
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return i - j;
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}
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static inline int
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current_is_kswapd(void)
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{
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return (curproc == pageproc);
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}
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#endif
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