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author | dyson <dyson@FreeBSD.org> | 1997-08-05 00:07:31 +0000 |
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committer | dyson <dyson@FreeBSD.org> | 1997-08-05 00:07:31 +0000 |
commit | 54005d6ed92a5387f42043a03fca4fbcb9b07bd9 (patch) | |
tree | f85e59f85e53e2abbd411fcbf9c8ff4a9edd72b8 /sys/vm | |
parent | 8a37859859e6f7dbdd0b4771735842513932eda9 (diff) | |
download | FreeBSD-src-54005d6ed92a5387f42043a03fca4fbcb9b07bd9.zip FreeBSD-src-54005d6ed92a5387f42043a03fca4fbcb9b07bd9.tar.gz |
A very simple zone allocator.
Diffstat (limited to 'sys/vm')
-rw-r--r-- | sys/vm/vm_zone.c | 227 | ||||
-rw-r--r-- | sys/vm/vm_zone.h | 82 |
2 files changed, 309 insertions, 0 deletions
diff --git a/sys/vm/vm_zone.c b/sys/vm/vm_zone.c new file mode 100644 index 0000000..17a8500 --- /dev/null +++ b/sys/vm/vm_zone.c @@ -0,0 +1,227 @@ +/* + * Copyright (c) 1997 John S. Dyson + * 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 immediately at the beginning of the file, without modification, + * 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. Absolutely no warranty of function or purpose is made by the author + * John S. Dyson. + * 4. This work was done expressly for inclusion into FreeBSD. Other use + * is allowed if this notation is included. + * 5. Modifications may be freely made to this file if the above conditions + * are met. + * + * $Id$ + */ + +#include <sys/param.h> +#include <sys/uio.h> +#include <sys/proc.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/vmmeter.h> +#include <sys/lock.h> + +#include <vm/vm.h> +#include <vm/vm_object.h> +#include <vm/vm_prot.h> +#include <vm/vm_page.h> +#include <vm/vm_param.h> +#include <vm/vm_kern.h> +#include <vm/vm_extern.h> +#include <vm/vm_zone.h> +#include <vm/vm_pageout.h> + +/* + * This file comprises a very simple zone allocator. This is used + * in lieu of the malloc allocator, where needed or more optimal. + * + * Note that the initial implementation of this had coloring, and + * absolutely no improvement (actually perf degradation) occurred. + * + * _zinit, zinit, _zbootinit are the initialization routines. + * zalloc, zfree, are the interrupt/lock unsafe allocation/free routines. + * zalloci, zfreei, are the interrupt/lock safe allocation/free routines. + */ + +int +_zinit(vm_zone_t z, vm_object_t obj, char *name, int size, + int nentries, int flags, int zalloc) { + int totsize; + + if ((z->zflags & ZONE_BOOT) == 0) { + + z->zsize = size; + simple_lock_init(&z->zlock); + z->zfreecnt = 0; + z->zname = name; + + } + + z->zflags |= flags; + + /* + * If we cannot wait, allocate KVA space up front, and we will fill + * in pages as needed. + */ + if ((z->zflags & ZONE_WAIT) == 0) { + + totsize = round_page(z->zsize * nentries); + + z->zkva = kmem_alloc_pageable(kernel_map, totsize); + if (z->zkva == 0) { + return 0; + } + + z->zpagemax = totsize / PAGE_SIZE; + if (obj == NULL) { + z->zobj = vm_object_allocate(OBJT_DEFAULT, z->zpagemax); + } else { + z->zobj = obj; + _vm_object_allocate(OBJT_DEFAULT, z->zpagemax, obj); + } + } + + if ( z->zsize > PAGE_SIZE) + z->zfreemin = 1; + else + z->zfreemin = PAGE_SIZE / z->zsize; + + z->zallocflag = VM_ALLOC_SYSTEM; + if (z->zflags & ZONE_INTERRUPT) + z->zallocflag = VM_ALLOC_INTERRUPT; + + z->zpagecount = 0; + if (zalloc) + z->zalloc = zalloc; + else + z->zalloc = 1; + + return 1; +} + +vm_zone_t +zinit(char *name, int size, int nentries, int flags, int zalloc) { + vm_zone_t z; + z = (vm_zone_t) malloc(sizeof (struct vm_zone), M_ZONE, M_NOWAIT); + if (z == NULL) + return NULL; + + if (_zinit(z, NULL, name, size, nentries, flags, zalloc) == 0) { + free(z, M_ZONE); + return NULL; + } + + return z; +} + +void +_zbootinit(vm_zone_t z, char *name, int size, void *item, int nitems) { + + int i; + + z->zname = name; + z->zsize = size; + z->zpagemax = 0; + z->zobj = NULL; + z->zflags = ZONE_BOOT; + z->zfreemin = 0; + z->zallocflag = 0; + z->zpagecount = 0; + z->zalloc = 0; + simple_lock_init(&z->zlock); + + for (i = 0; i < nitems; i++) { + * (void **) item = z->zitems; + z->zitems = item; + ++z->zfreecnt; + (char *) item += z->zsize; + } +} + +static inline int +zlock(vm_zone_t z) { + int s; + s = splhigh(); + simple_lock(&z->zlock); + return s; +} + +static inline void +zunlock(vm_zone_t z, int s) { + simple_unlock(&z->zlock); + splx(s); +} + +void * +zalloci(vm_zone_t z) { + int s; + void *item; + + s = zlock(z); + item = zalloc(z); + zunlock(z, s); + return item; +} + +void +zfreei(vm_zone_t z, void *item) { + int s; + + s = zlock(z); + zfree(z, item); + zunlock(z, s); + return; +} + +void * +zget(vm_zone_t z, int s) { + int i; + vm_page_t m; + int nitems; + void *item, *litem; + + if ((z->zflags & ZONE_WAIT) == 0) { + item = (char *) z->zkva + z->zpagecount * PAGE_SIZE; + for( i = 0; ((i < z->zalloc) && (z->zpagecount < z->zpagemax)); i++) { + + m = vm_page_alloc( z->zobj, z->zpagecount, z->zallocflag); + if (m == NULL) { + break; + } + + pmap_kenter(z->zkva + z->zpagecount * PAGE_SIZE, VM_PAGE_TO_PHYS(m)); + ++z->zpagecount; + } + nitems = (i * PAGE_SIZE) / z->zsize; + } else { + /* + * We can wait, so just do normal kernel map allocation + */ + item = (void *) kmem_alloc(kernel_map, z->zalloc * PAGE_SIZE); + nitems = (z->zalloc * PAGE_SIZE) / z->zsize; + } + + /* + * Save one for immediate allocation + */ + nitems -= 1; + for (i = 0; i < nitems; i++) { + * (void **) item = z->zitems; + z->zitems = item; + (char *) item += z->zsize; + ++z->zfreecnt; + } + + return item; +} + diff --git a/sys/vm/vm_zone.h b/sys/vm/vm_zone.h new file mode 100644 index 0000000..7f6630d --- /dev/null +++ b/sys/vm/vm_zone.h @@ -0,0 +1,82 @@ + +#if !defined(_SYS_ZONE_H) + +#define _SYS_ZONE_H + +#define ZONE_COLOR 1 +#define ZONE_INTERRUPT 2 +#define ZONE_WAIT 4 +#define ZONE_PREALLOCATE 8 +#define ZONE_BOOT 16 + +#include <machine/param.h> +#include <sys/lock.h> + + +#define CACHE_LINE_SIZE 32 + +typedef struct vm_zone { + struct simplelock zlock; /* lock for data structure */ + void *zitems; /* linked list of items */ + int zfreemin; /* minimum number of free entries */ + int zfreecnt; /* free entries */ + vm_offset_t zkva; /* Base kva of zone */ + int zpagecount; /* Total # of allocated pages */ + int zpagemax; /* Max address space */ + int zsize; /* size of each entry */ + int zalloc; /* hint for # of pages to alloc */ + int zflags; /* flags for zone */ + int zallocflag; /* flag for allocation */ + struct vm_object *zobj; /* object to hold zone */ + char *zname; /* name for diags */ +} *vm_zone_t; + + +vm_zone_t zinit(char *name, int size, int nentries, int flags, int zalloc); +int _zinit(vm_zone_t z, struct vm_object *obj, char *name, int size, + int nentries, int flags, int zalloc); +static void * zalloc(vm_zone_t z); +static void zfree(vm_zone_t z, void *item); +void * zalloci(vm_zone_t z) __attribute__((regparm(1))); +void zfreei(vm_zone_t z, void *item) __attribute__((regparm(2))); +void _zbootinit(vm_zone_t z, char *name, int size, void *item, int nitems) ; +void * zget(vm_zone_t z, int s) __attribute__((regparm(2))); + +#if SMP > 1 + +static __inline__ void * +zalloc(vm_zone_t z) { + return zalloci(z); +} + +static __inline__ void +zfree(vm_zone_t z, void *item) { + zfreei(z, item); +} + +#else + +static __inline__ void * +zalloc(vm_zone_t z) { + int s; + void *item; + + if (z->zfreecnt <= z->zfreemin) { + return zget(z, s); + } + + item = z->zitems; + z->zitems = *(void **) item; + --z->zfreecnt; + return item; +} + +static __inline__ void +zfree(vm_zone_t z, void *item) { + * (void **) item = z->zitems; + z->zitems = item; + ++z->zfreecnt; +} +#endif + +#endif |