freebsd-dev/sys/powerpc/aim/uma_machdep.c
Konstantin Belousov b32ecf44bc Flip the semantic of M_NOWAIT to only require the allocation to not
sleep, and perform the page allocations with VM_ALLOC_SYSTEM
class. Previously, the allocation was also allowed to completely drain
the reserve of the free pages, being translated to VM_ALLOC_INTERRUPT
request class for vm_page_alloc() and similar functions.

Allow the caller of malloc* to request the 'deep drain' semantic by
providing M_USE_RESERVE flag, now translated to VM_ALLOC_INTERRUPT
class. Previously, it resulted in less aggressive VM_ALLOC_SYSTEM
allocation class.

Centralize the translation of the M_* malloc(9) flags in the single
inline function malloc2vm_flags().

Discussion started by:	"Sears, Steven" <Steven.Sears@netapp.com>
Reviewed by:	alc, mdf (previous version)
Tested by:	pho (previous version)
MFC after:	2 weeks
2012-11-14 20:01:40 +00:00

99 lines
2.8 KiB
C

/*-
* Copyright (c) 2003 The FreeBSD Project
* All rights reserved.
*
* 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 ``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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_kern.h>
#include <vm/vm_pageout.h>
#include <vm/vm_extern.h>
#include <vm/uma.h>
#include <vm/uma.h>
#include <vm/uma_int.h>
#include <machine/md_var.h>
#include <machine/vmparam.h>
static int hw_uma_mdpages;
SYSCTL_INT(_hw, OID_AUTO, uma_mdpages, CTLFLAG_RD, &hw_uma_mdpages, 0,
"UMA MD pages in use");
void *
uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
{
void *va;
vm_page_t m;
int pflags;
*flags = UMA_SLAB_PRIV;
pflags = malloc2vm_flags(wait) | VM_ALLOC_WIRED;
for (;;) {
m = vm_page_alloc(NULL, 0, pflags | VM_ALLOC_NOOBJ);
if (m == NULL) {
if (wait & M_NOWAIT)
return (NULL);
VM_WAIT;
} else
break;
}
va = (void *) VM_PAGE_TO_PHYS(m);
if (!hw_direct_map)
pmap_kenter((vm_offset_t)va, VM_PAGE_TO_PHYS(m));
if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
bzero(va, PAGE_SIZE);
atomic_add_int(&hw_uma_mdpages, 1);
return (va);
}
void
uma_small_free(void *mem, int size, u_int8_t flags)
{
vm_page_t m;
if (!hw_direct_map)
pmap_remove(kernel_pmap,(vm_offset_t)mem,
(vm_offset_t)mem + PAGE_SIZE);
m = PHYS_TO_VM_PAGE((vm_offset_t)mem);
m->wire_count--;
vm_page_free(m);
atomic_subtract_int(&cnt.v_wire_count, 1);
atomic_subtract_int(&hw_uma_mdpages, 1);
}