d19ef81437
need for most calls to vm_page_busy(). Specifically, most calls to vm_page_busy() occur immediately prior to a call to vm_page_remove(). In such cases, the containing vm object is locked across both calls. Consequently, the setting of the vm page's PG_BUSY flag is not even visible to other threads that are following the synchronization protocol. This change (1) eliminates the calls to vm_page_busy() that immediately precede a call to vm_page_remove() or functions, such as vm_page_free() and vm_page_rename(), that call it and (2) relaxes the requirement in vm_page_remove() that the vm page's PG_BUSY flag is set. Now, the vm page's PG_BUSY flag is set only when the vm object lock is released while the vm page is still in transition. Typically, this is when it is undergoing I/O.
255 lines
6.4 KiB
C
255 lines
6.4 KiB
C
/*-
|
|
* Copyright (c) 1997, Duke University
|
|
* All rights reserved.
|
|
*
|
|
* Author:
|
|
* Andrew Gallatin <gallatin@cs.duke.edu>
|
|
*
|
|
* 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.
|
|
* 3. The name of Duke University may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY DUKE UNIVERSITY ``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 DUKE UNIVERSITY 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 PROFITSOR 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.
|
|
*/
|
|
|
|
/*
|
|
* This is a set of routines for allocating large-sized mbuf payload
|
|
* areas, and is primarily intended for use in receive side mbuf
|
|
* allocation.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/types.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/malloc.h>
|
|
#include <vm/vm.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_pageout.h>
|
|
#include <sys/vmmeter.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_kern.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/jumbo.h>
|
|
|
|
/*
|
|
* XXX this may be too high or too low.
|
|
*/
|
|
#define JUMBO_MAX_PAGES 3072
|
|
|
|
struct jumbo_kmap {
|
|
vm_offset_t kva;
|
|
SLIST_ENTRY(jumbo_kmap) entries; /* Singly-linked List. */
|
|
};
|
|
|
|
static SLIST_HEAD(jumbo_kmap_head, jumbo_kmap) jumbo_kmap_free,
|
|
jumbo_kmap_inuse;
|
|
|
|
static struct mtx jumbo_mutex;
|
|
MTX_SYSINIT(jumbo_lock, &jumbo_mutex, "jumbo mutex", MTX_DEF);
|
|
|
|
static struct vm_object *jumbo_vm_object;
|
|
static unsigned long jumbo_vmuiomove_pgs_freed = 0;
|
|
#if 0
|
|
static int jumbo_vm_wakeup_wanted = 0;
|
|
#endif
|
|
vm_offset_t jumbo_basekva;
|
|
|
|
int
|
|
jumbo_vm_init(void)
|
|
{
|
|
int i;
|
|
struct jumbo_kmap *entry;
|
|
|
|
mtx_lock(&jumbo_mutex);
|
|
|
|
if (jumbo_vm_object != NULL) {
|
|
mtx_unlock(&jumbo_mutex);
|
|
return (1);
|
|
}
|
|
|
|
/* allocate our object */
|
|
jumbo_vm_object = vm_object_allocate_wait(OBJT_DEFAULT, JUMBO_MAX_PAGES,
|
|
M_NOWAIT);
|
|
|
|
if (jumbo_vm_object == NULL) {
|
|
mtx_unlock(&jumbo_mutex);
|
|
return (0);
|
|
}
|
|
|
|
SLIST_INIT(&jumbo_kmap_free);
|
|
SLIST_INIT(&jumbo_kmap_inuse);
|
|
|
|
/* grab some kernel virtual address space */
|
|
jumbo_basekva = kmem_alloc_nofault(kernel_map,
|
|
PAGE_SIZE * JUMBO_MAX_PAGES);
|
|
if (jumbo_basekva == 0) {
|
|
vm_object_deallocate(jumbo_vm_object);
|
|
jumbo_vm_object = NULL;
|
|
mtx_unlock(&jumbo_mutex);
|
|
return 0;
|
|
}
|
|
for (i = 0; i < JUMBO_MAX_PAGES; i++) {
|
|
entry = malloc(sizeof(struct jumbo_kmap), M_TEMP, M_NOWAIT);
|
|
if (!entry && !i) {
|
|
mtx_unlock(&jumbo_mutex);
|
|
panic("jumbo_vm_init: unable to allocated kvas");
|
|
} else if (!entry) {
|
|
printf("warning: jumbo_vm_init allocated only %d kva\n",
|
|
i);
|
|
mtx_unlock(&jumbo_mutex);
|
|
return 1;
|
|
}
|
|
entry->kva = jumbo_basekva + (vm_offset_t)i * PAGE_SIZE;
|
|
SLIST_INSERT_HEAD(&jumbo_kmap_free, entry, entries);
|
|
}
|
|
mtx_unlock(&jumbo_mutex);
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
jumbo_freem(void *addr, void *args)
|
|
{
|
|
vm_page_t frame;
|
|
|
|
frame = PHYS_TO_VM_PAGE(pmap_kextract((vm_offset_t)addr));
|
|
|
|
/*
|
|
* Need giant for looking at the hold count below. Convert this
|
|
* to the vm mutex once the VM code has been moved out from under
|
|
* giant.
|
|
*/
|
|
GIANT_REQUIRED;
|
|
|
|
if (frame->hold_count == 0)
|
|
jumbo_pg_free((vm_offset_t)addr);
|
|
else
|
|
printf("jumbo_freem: hold count for %p is %d!!??\n",
|
|
frame, frame->hold_count);
|
|
}
|
|
|
|
void
|
|
jumbo_pg_steal(vm_page_t pg)
|
|
{
|
|
vm_offset_t addr;
|
|
struct jumbo_kmap *entry;
|
|
|
|
addr = ptoa(pg->pindex) + jumbo_basekva;
|
|
|
|
if (pg->object != jumbo_vm_object)
|
|
panic("stealing a non jumbo_vm_object page");
|
|
vm_page_remove(pg);
|
|
|
|
mtx_lock(&jumbo_mutex);
|
|
|
|
pmap_qremove(addr,1);
|
|
entry = SLIST_FIRST(&jumbo_kmap_inuse);
|
|
entry->kva = addr;
|
|
SLIST_REMOVE_HEAD(&jumbo_kmap_inuse, entries);
|
|
SLIST_INSERT_HEAD(&jumbo_kmap_free, entry, entries);
|
|
|
|
mtx_unlock(&jumbo_mutex);
|
|
|
|
#if 0
|
|
if (jumbo_vm_wakeup_wanted)
|
|
wakeup(jumbo_vm_object);
|
|
#endif
|
|
}
|
|
|
|
|
|
vm_page_t
|
|
jumbo_pg_alloc(void)
|
|
{
|
|
vm_page_t pg;
|
|
vm_pindex_t pindex;
|
|
struct jumbo_kmap *entry;
|
|
|
|
pg = NULL;
|
|
mtx_lock(&jumbo_mutex);
|
|
|
|
entry = SLIST_FIRST(&jumbo_kmap_free);
|
|
if (entry != NULL){
|
|
pindex = atop(entry->kva - jumbo_basekva);
|
|
VM_OBJECT_LOCK(jumbo_vm_object);
|
|
pg = vm_page_alloc(jumbo_vm_object, pindex, VM_ALLOC_INTERRUPT);
|
|
VM_OBJECT_UNLOCK(jumbo_vm_object);
|
|
if (pg != NULL) {
|
|
SLIST_REMOVE_HEAD(&jumbo_kmap_free, entries);
|
|
SLIST_INSERT_HEAD(&jumbo_kmap_inuse, entry, entries);
|
|
pmap_qenter(entry->kva, &pg, 1);
|
|
}
|
|
}
|
|
mtx_unlock(&jumbo_mutex);
|
|
return(pg);
|
|
}
|
|
|
|
void
|
|
jumbo_pg_free(vm_offset_t addr)
|
|
{
|
|
struct jumbo_kmap *entry;
|
|
vm_paddr_t paddr;
|
|
vm_page_t pg;
|
|
|
|
paddr = pmap_kextract((vm_offset_t)addr);
|
|
pg = PHYS_TO_VM_PAGE(paddr);
|
|
|
|
VM_OBJECT_LOCK(jumbo_vm_object);
|
|
if (pg->object != jumbo_vm_object) {
|
|
jumbo_vmuiomove_pgs_freed++;
|
|
/* if(vm_page_lookup(jumbo_vm_object, atop(addr - jumbo_basekva)))
|
|
panic("vm_page_rename didn't");
|
|
printf("freeing uiomoved pg:\t pindex = %d, padd = 0x%lx\n",
|
|
atop(addr - jumbo_basekva), paddr);
|
|
*/
|
|
} else {
|
|
vm_page_lock_queues();
|
|
vm_page_free(pg);
|
|
vm_page_unlock_queues();
|
|
}
|
|
VM_OBJECT_UNLOCK(jumbo_vm_object);
|
|
|
|
mtx_lock(&jumbo_mutex);
|
|
|
|
pmap_qremove(addr,1);
|
|
entry = SLIST_FIRST(&jumbo_kmap_inuse);
|
|
entry->kva = addr;
|
|
SLIST_REMOVE_HEAD(&jumbo_kmap_inuse, entries);
|
|
SLIST_INSERT_HEAD(&jumbo_kmap_free, entry, entries);
|
|
|
|
mtx_unlock(&jumbo_mutex);
|
|
|
|
#if 0
|
|
if (jumbo_vm_wakeup_wanted)
|
|
wakeup(jumbo_vm_object);
|
|
#endif
|
|
}
|