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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [mmnommu/] [swap.c] - Blame information for rev 1765

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/*
 *  linux/mm/swap.c
 *
 *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 */
 
/*
 * DJD: This file should go away for uClinux...
 * Need to look for dependancies.
 */
 
/*
 * This file should contain most things doing the swapping from/to disk.
 * Started 18.12.91
 *
 * Swap aging added 23.2.95, Stephen Tweedie.
 */
 
/*
 * uClinux revisions for NO_MM
 * Copyright (C) 1998  Kenneth Albanowski <kjahds@kjahds.com>,
 *                     The Silver Hammer Group, Ltd.
 * Copyright (C) 1999  D. Jeff Dionne <jeff@uclinux.org>,
 *                     Rt-Control, Inc.
 */
 
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/head.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/swap.h>
#include <linux/fs.h>
#include <linux/swapctl.h>
#include <linux/pagemap.h>
 
#include <asm/dma.h>
#include <asm/system.h> /* for cli()/sti() */
#include <asm/segment.h> /* for memcpy_to/fromfs */
#include <asm/bitops.h>
#include <asm/pgtable.h>
 
/*
 * We identify three levels of free memory.  We never let free mem
 * fall below the min_free_pages except for atomic allocations.  We
 * start background swapping if we fall below free_pages_high free
 * pages, and we begin intensive swapping below free_pages_low.
 *
 * Keep these three variables contiguous for sysctl(2).
 */
int min_free_pages = 20;
int free_pages_low = 30;
int free_pages_high = 40;
 
/* We track the number of pages currently being asynchronously swapped
   out, so that we don't try to swap TOO many pages out at once */
atomic_t nr_async_pages = 0;
 
/*
 * Constants for the page aging mechanism: the maximum age (actually,
 * the maximum "youthfulness"); the quanta by which pages rejuvenate
 * and age; and the initial age for new pages.
 */
 
swap_control_t swap_control = {
        20, 3, 1, 3,            /* Page aging */
        10, 2, 2, 4,            /* Buffer aging */
        32, 4,                  /* Aging cluster */
        8192, 8192,             /* Pageout and bufferout weights */
        -200,                   /* Buffer grace */
        1, 1,                   /* Buffs/pages to free */
        RCL_ROUND_ROBIN         /* Balancing policy */
};
 
swapstat_t swapstats = {0};
 
/* General swap control */
 
/* Parse the kernel command line "swap=" option at load time: */
void swap_setup(char *str, int *ints)
{
}
 
/* Parse the kernel command line "buff=" option at load time: */
void buff_setup(char *str, int *ints)
{
}
 

Line No.	Rev	Author	Line
1	1634	jcastillo	`/*`
2			`* linux/mm/swap.c`
3			`*`
4			`* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds`
5			`*/`
6
7			`/*`
8			`* DJD: This file should go away for uClinux...`
9			`* Need to look for dependancies.`
10			`*/`
11
12			`/*`
13			`* This file should contain most things doing the swapping from/to disk.`
14			`* Started 18.12.91`
15			`*`
16			`* Swap aging added 23.2.95, Stephen Tweedie.`
17			`*/`
18
19			`/*`
20			`* uClinux revisions for NO_MM`
21			`* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,`
22			`* The Silver Hammer Group, Ltd.`
23			`* Copyright (C) 1999 D. Jeff Dionne <jeff@uclinux.org>,`
24			`* Rt-Control, Inc.`
25			`*/`
26
27			`#include <linux/mm.h>`
28			`#include <linux/sched.h>`
29			`#include <linux/head.h>`
30			`#include <linux/kernel.h>`
31			`#include <linux/kernel_stat.h>`
32			`#include <linux/errno.h>`
33			`#include <linux/string.h>`
34			`#include <linux/stat.h>`
35			`#include <linux/swap.h>`
36			`#include <linux/fs.h>`
37			`#include <linux/swapctl.h>`
38			`#include <linux/pagemap.h>`
39
40			`#include <asm/dma.h>`
41			`#include <asm/system.h> /* for cli()/sti() */`
42			`#include <asm/segment.h> /* for memcpy_to/fromfs */`
43			`#include <asm/bitops.h>`
44			`#include <asm/pgtable.h>`
45
46			`/*`
47			`* We identify three levels of free memory. We never let free mem`
48			`* fall below the min_free_pages except for atomic allocations. We`
49			`* start background swapping if we fall below free_pages_high free`
50			`* pages, and we begin intensive swapping below free_pages_low.`
51			`*`
52			`* Keep these three variables contiguous for sysctl(2).`
53			`*/`
54			`int min_free_pages = 20;`
55			`int free_pages_low = 30;`
56			`int free_pages_high = 40;`
57
58			`/* We track the number of pages currently being asynchronously swapped`
59			`out, so that we don't try to swap TOO many pages out at once */`
60			`atomic_t nr_async_pages = 0;`
61
62			`/*`
63			`* Constants for the page aging mechanism: the maximum age (actually,`
64			`* the maximum "youthfulness"); the quanta by which pages rejuvenate`
65			`* and age; and the initial age for new pages.`
66			`*/`
67
68			`swap_control_t swap_control = {`
69			`20, 3, 1, 3, /* Page aging */`
70			`10, 2, 2, 4, /* Buffer aging */`
71			`32, 4, /* Aging cluster */`
72			`8192, 8192, /* Pageout and bufferout weights */`
73			`-200, /* Buffer grace */`
74			`1, 1, /* Buffs/pages to free */`
75			`RCL_ROUND_ROBIN /* Balancing policy */`
76			`};`
77
78			`swapstat_t swapstats = {0};`
79
80			`/* General swap control */`
81
82			`/* Parse the kernel command line "swap=" option at load time: */`
83			`void swap_setup(char str, int ints)`
84			`{`
85			`}`
86
87			`/* Parse the kernel command line "buff=" option at load time: */`
88			`void buff_setup(char str, int ints)`
89			`{`
90			`}`
91

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [mmnommu/] [swap.c] - Blame information for rev 1765