Date: Tue, 20 Nov 2018 22:49:19 +0000 (UTC) From: Ben Widawsky <bwidawsk@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340709 - in head/sys: compat/linuxkpi/common/include/linux vm Message-ID: <201811202249.wAKMnJxH082469@repo.freebsd.org>
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Author: bwidawsk Date: Tue Nov 20 22:49:19 2018 New Revision: 340709 URL: https://svnweb.freebsd.org/changeset/base/340709 Log: linuxkpi: Add some basic swap functions These are used by kms-drm to determine various heuristics relate memory conditions. The number of free swap pages is just a variable, and it can be much cheaper by either adding a new getter, or simply extern'ing swap_total. However, this patch opts to use the more expensive, existing interface - since this isn't an operation in a high per path. This allows us to remove some more gpl linuxkpi and do the follo kms-drm: git rm linuxkpi/gplv2/include/linux/swap.h Reviewed by: mmacy, Johannes Lundberg <johalun0@gmail.com> Approved by: emaste (mentor) Differential Revision: https://reviews.freebsd.org/D18052 Added: head/sys/compat/linuxkpi/common/include/linux/swap.h (contents, props changed) Modified: head/sys/vm/vm_pageout.h head/sys/vm/vm_swapout.c Added: head/sys/compat/linuxkpi/common/include/linux/swap.h ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/compat/linuxkpi/common/include/linux/swap.h Tue Nov 20 22:49:19 2018 (r340709) @@ -0,0 +1,102 @@ +/*- + * Copyright (c) 2018 Intel Corporation + * + * 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. + * + * $FreeBSD$ + */ + +#ifndef _LINUX_SWAP_H_ +#define _LINUX_SWAP_H_ + +#include <vm/swap_pager.h> +#include <vm/vm_pageout.h> + +static inline long +get_nr_swap_pages(void) +{ + int i, j; + + /* NB: This could be done cheaply by obtaining swap_total directly */ + swap_pager_status(&i, &j); + return i - j; +} + +static inline int +current_is_kswapd(void) +{ + return vm_curproc_is_vmproc(); +} + +#endif +/*- + * Copyright (c) 2018 Intel Corporation + * + * 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. + * + * $FreeBSD$ + */ + +#ifndef _LINUX_SWAP_H_ +#define _LINUX_SWAP_H_ + +#include <vm/swap_pager.h> +#include <vm/vm_pageout.h> + +static inline long +get_nr_swap_pages(void) +{ + int i, j; + + /* NB: This could be done cheaply by obtaining swap_total directly */ + swap_pager_status(&i, &j); + return i - j; +} + +static inline int +current_is_kswapd(void) +{ + return vm_curproc_is_vmproc(); +} + +#endif Modified: head/sys/vm/vm_pageout.h ============================================================================== --- head/sys/vm/vm_pageout.h Tue Nov 20 22:24:18 2018 (r340708) +++ head/sys/vm/vm_pageout.h Tue Nov 20 22:49:19 2018 (r340709) @@ -106,5 +106,8 @@ void vm_pageout_oom(int shortage); void vm_swapout_run(void); void vm_swapout_run_idle(void); + +bool vm_curproc_is_vmproc(void); + #endif /* _KERNEL */ #endif /* _VM_VM_PAGEOUT_H_ */ Modified: head/sys/vm/vm_swapout.c ============================================================================== --- head/sys/vm/vm_swapout.c Tue Nov 20 22:24:18 2018 (r340708) +++ head/sys/vm/vm_swapout.c Tue Nov 20 22:49:19 2018 (r340709) @@ -961,3 +961,10 @@ swapout(struct proc *p) p->p_swtick = ticks; return (0); } + +/* Used to determine if the current process is itself the reaper. */ +bool +vm_curproc_is_vmproc(void) +{ + return curproc == vmproc; +}
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