| vfs_bio.c (54911) | vfs_bio.c (55539) |
|---|---|
| 1/* 2 * Copyright (c) 1994,1997 John S. Dyson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice immediately at the beginning of the file, without modification, 10 * this list of conditions, and the following disclaimer. 11 * 2. Absolutely no warranty of function or purpose is made by the author 12 * John S. Dyson. 13 * | 1/* 2 * Copyright (c) 1994,1997 John S. Dyson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice immediately at the beginning of the file, without modification, 10 * this list of conditions, and the following disclaimer. 11 * 2. Absolutely no warranty of function or purpose is made by the author 12 * John S. Dyson. 13 * |
| 14 * $FreeBSD: head/sys/kern/vfs_bio.c 54911 1999-12-20 20:28:40Z dillon $ | 14 * $FreeBSD: head/sys/kern/vfs_bio.c 55539 2000-01-07 08:36:44Z luoqi $ |
| 15 */ 16 17/* 18 * this file contains a new buffer I/O scheme implementing a coherent 19 * VM object and buffer cache scheme. Pains have been taken to make 20 * sure that the performance degradation associated with schemes such 21 * as this is not realized. 22 * 23 * Author: John S. Dyson 24 * Significant help during the development and debugging phases 25 * had been provided by David Greenman, also of the FreeBSD core team. 26 * 27 * see man buf(9) for more info. 28 */ 29 30#include <sys/param.h> 31#include <sys/systm.h> | 15 */ 16 17/* 18 * this file contains a new buffer I/O scheme implementing a coherent 19 * VM object and buffer cache scheme. Pains have been taken to make 20 * sure that the performance degradation associated with schemes such 21 * as this is not realized. 22 * 23 * Author: John S. Dyson 24 * Significant help during the development and debugging phases 25 * had been provided by David Greenman, also of the FreeBSD core team. 26 * 27 * see man buf(9) for more info. 28 */ 29 30#include <sys/param.h> 31#include <sys/systm.h> |
| 32#include <sys/buf.h> 33#include <sys/conf.h> 34#include <sys/eventhandler.h> 35#include <sys/lock.h> 36#include <sys/malloc.h> 37#include <sys/mount.h> |
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| 32#include <sys/kernel.h> | 38#include <sys/kernel.h> |
| 33#include <sys/sysctl.h> 34#include <sys/proc.h> | |
| 35#include <sys/kthread.h> | 39#include <sys/kthread.h> |
| 36#include <sys/vnode.h> | 40#include <sys/proc.h> 41#include <sys/reboot.h> 42#include <sys/resourcevar.h> 43#include <sys/sysctl.h> |
| 37#include <sys/vmmeter.h> | 44#include <sys/vmmeter.h> |
| 38#include <sys/lock.h> | 45#include <sys/vnode.h> |
| 39#include <vm/vm.h> 40#include <vm/vm_param.h> 41#include <vm/vm_kern.h> 42#include <vm/vm_pageout.h> 43#include <vm/vm_page.h> 44#include <vm/vm_object.h> 45#include <vm/vm_extern.h> 46#include <vm/vm_map.h> | 46#include <vm/vm.h> 47#include <vm/vm_param.h> 48#include <vm/vm_kern.h> 49#include <vm/vm_pageout.h> 50#include <vm/vm_page.h> 51#include <vm/vm_object.h> 52#include <vm/vm_extern.h> 53#include <vm/vm_map.h> |
| 47#include <sys/buf.h> 48#include <sys/mount.h> 49#include <sys/malloc.h> 50#include <sys/resourcevar.h> 51#include <sys/conf.h> | |
| 52 53static MALLOC_DEFINE(M_BIOBUF, "BIO buffer", "BIO buffer"); 54 55struct bio_ops bioops; /* I/O operation notification */ 56 57struct buf *buf; /* buffer header pool */ 58struct swqueue bswlist; 59 --- 1601 unchanged lines hidden (view full) --- 1661 &bufdaemonproc 1662}; 1663SYSINIT(bufdaemon, SI_SUB_KTHREAD_BUF, SI_ORDER_FIRST, kproc_start, &buf_kp) 1664 1665static void 1666buf_daemon() 1667{ 1668 int s; | 54 55static MALLOC_DEFINE(M_BIOBUF, "BIO buffer", "BIO buffer"); 56 57struct bio_ops bioops; /* I/O operation notification */ 58 59struct buf *buf; /* buffer header pool */ 60struct swqueue bswlist; 61 --- 1601 unchanged lines hidden (view full) --- 1663 &bufdaemonproc 1664}; 1665SYSINIT(bufdaemon, SI_SUB_KTHREAD_BUF, SI_ORDER_FIRST, kproc_start, &buf_kp) 1666 1667static void 1668buf_daemon() 1669{ 1670 int s; |
| 1671 |
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| 1669 /* | 1672 /* |
| 1673 * This process needs to be suspended prior to shutdown sync. 1674 */ 1675 EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, bufdaemonproc, 1676 SHUTDOWN_PRI_LAST); 1677 1678 /* |
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| 1670 * This process is allowed to take the buffer cache to the limit 1671 */ 1672 curproc->p_flag |= P_BUFEXHAUST; 1673 s = splbio(); 1674 1675 bd_interval = 5 * hz; /* dynamically adjusted */ 1676 bd_flushto = hidirtybuffers; /* dynamically adjusted */ 1677 bd_flushinc = 1; 1678 | 1679 * This process is allowed to take the buffer cache to the limit 1680 */ 1681 curproc->p_flag |= P_BUFEXHAUST; 1682 s = splbio(); 1683 1684 bd_interval = 5 * hz; /* dynamically adjusted */ 1685 bd_flushto = hidirtybuffers; /* dynamically adjusted */ 1686 bd_flushinc = 1; 1687 |
| 1679 while (TRUE) { | 1688 for (;;) { 1689 kproc_suspend_loop(bufdaemonproc); 1690 |
| 1680 bd_request = 0; 1681 1682 /* 1683 * Do the flush. Limit the number of buffers we flush in one 1684 * go. The failure condition occurs when processes are writing 1685 * buffers faster then we can dispose of them. In this case 1686 * we may be flushing so often that the previous set of flushes 1687 * have not had time to complete, causing us to run out of --- 1402 unchanged lines hidden --- | 1691 bd_request = 0; 1692 1693 /* 1694 * Do the flush. Limit the number of buffers we flush in one 1695 * go. The failure condition occurs when processes are writing 1696 * buffers faster then we can dispose of them. In this case 1697 * we may be flushing so often that the previous set of flushes 1698 * have not had time to complete, causing us to run out of --- 1402 unchanged lines hidden --- |