Based on a patch from Sandvine Incorporated via emaste. Reviewed by: emaste MFC after: 1 week
1031 lines
26 KiB
C
1031 lines
26 KiB
C
/*-
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* Copyright (c) 1987, 1991, 1993
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* The Regents of the University of California.
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* Copyright (c) 2005-2009 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_malloc.c 8.3 (Berkeley) 1/4/94
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*/
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/*
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* Kernel malloc(9) implementation -- general purpose kernel memory allocator
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* based on memory types. Back end is implemented using the UMA(9) zone
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* allocator. A set of fixed-size buckets are used for smaller allocations,
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* and a special UMA allocation interface is used for larger allocations.
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* Callers declare memory types, and statistics are maintained independently
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* for each memory type. Statistics are maintained per-CPU for performance
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* reasons. See malloc(9) and comments in malloc.h for a detailed
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* description.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_kdtrace.h"
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#include "opt_vm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/vmmeter.h>
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#include <sys/proc.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_param.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/uma.h>
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#include <vm/uma_int.h>
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#include <vm/uma_dbg.h>
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#ifdef DEBUG_MEMGUARD
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#include <vm/memguard.h>
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#endif
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#ifdef DEBUG_REDZONE
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#include <vm/redzone.h>
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#endif
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#if defined(INVARIANTS) && defined(__i386__)
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#include <machine/cpu.h>
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#endif
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#include <ddb/ddb.h>
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#ifdef KDTRACE_HOOKS
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#include <sys/dtrace_bsd.h>
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dtrace_malloc_probe_func_t dtrace_malloc_probe;
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#endif
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/*
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* When realloc() is called, if the new size is sufficiently smaller than
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* the old size, realloc() will allocate a new, smaller block to avoid
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* wasting memory. 'Sufficiently smaller' is defined as: newsize <=
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* oldsize / 2^n, where REALLOC_FRACTION defines the value of 'n'.
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*/
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#ifndef REALLOC_FRACTION
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#define REALLOC_FRACTION 1 /* new block if <= half the size */
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#endif
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/*
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* Centrally define some common malloc types.
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*/
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MALLOC_DEFINE(M_CACHE, "cache", "Various Dynamically allocated caches");
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MALLOC_DEFINE(M_DEVBUF, "devbuf", "device driver memory");
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MALLOC_DEFINE(M_TEMP, "temp", "misc temporary data buffers");
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MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
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MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
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static void kmeminit(void *);
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SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_FIRST, kmeminit, NULL);
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static MALLOC_DEFINE(M_FREE, "free", "should be on free list");
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static struct malloc_type *kmemstatistics;
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static vm_offset_t kmembase;
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static vm_offset_t kmemlimit;
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static int kmemcount;
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#define KMEM_ZSHIFT 4
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#define KMEM_ZBASE 16
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#define KMEM_ZMASK (KMEM_ZBASE - 1)
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#define KMEM_ZMAX PAGE_SIZE
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#define KMEM_ZSIZE (KMEM_ZMAX >> KMEM_ZSHIFT)
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static uint8_t kmemsize[KMEM_ZSIZE + 1];
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#ifndef MALLOC_DEBUG_MAXZONES
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#define MALLOC_DEBUG_MAXZONES 1
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#endif
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static int numzones = MALLOC_DEBUG_MAXZONES;
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/*
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* Small malloc(9) memory allocations are allocated from a set of UMA buckets
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* of various sizes.
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*
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* XXX: The comment here used to read "These won't be powers of two for
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* long." It's possible that a significant amount of wasted memory could be
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* recovered by tuning the sizes of these buckets.
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*/
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struct {
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int kz_size;
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char *kz_name;
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uma_zone_t kz_zone[MALLOC_DEBUG_MAXZONES];
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} kmemzones[] = {
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{16, "16", },
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{32, "32", },
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{64, "64", },
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{128, "128", },
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{256, "256", },
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{512, "512", },
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{1024, "1024", },
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{2048, "2048", },
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{4096, "4096", },
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#if PAGE_SIZE > 4096
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{8192, "8192", },
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#if PAGE_SIZE > 8192
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{16384, "16384", },
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#if PAGE_SIZE > 16384
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{32768, "32768", },
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#if PAGE_SIZE > 32768
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{65536, "65536", },
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#if PAGE_SIZE > 65536
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#error "Unsupported PAGE_SIZE"
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#endif /* 65536 */
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#endif /* 32768 */
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#endif /* 16384 */
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#endif /* 8192 */
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#endif /* 4096 */
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{0, NULL},
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};
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/*
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* Zone to allocate malloc type descriptions from. For ABI reasons, memory
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* types are described by a data structure passed by the declaring code, but
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* the malloc(9) implementation has its own data structure describing the
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* type and statistics. This permits the malloc(9)-internal data structures
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* to be modified without breaking binary-compiled kernel modules that
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* declare malloc types.
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*/
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static uma_zone_t mt_zone;
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u_long vm_kmem_size;
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SYSCTL_ULONG(_vm, OID_AUTO, kmem_size, CTLFLAG_RDTUN, &vm_kmem_size, 0,
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"Size of kernel memory");
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static u_long vm_kmem_size_min;
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SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_min, CTLFLAG_RDTUN, &vm_kmem_size_min, 0,
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"Minimum size of kernel memory");
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static u_long vm_kmem_size_max;
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SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_max, CTLFLAG_RDTUN, &vm_kmem_size_max, 0,
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"Maximum size of kernel memory");
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static u_int vm_kmem_size_scale;
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SYSCTL_UINT(_vm, OID_AUTO, kmem_size_scale, CTLFLAG_RDTUN, &vm_kmem_size_scale, 0,
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"Scale factor for kernel memory size");
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static int sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS);
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SYSCTL_PROC(_vm, OID_AUTO, kmem_map_size,
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CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
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sysctl_kmem_map_size, "LU", "Current kmem_map allocation size");
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/*
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* The malloc_mtx protects the kmemstatistics linked list.
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*/
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struct mtx malloc_mtx;
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#ifdef MALLOC_PROFILE
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uint64_t krequests[KMEM_ZSIZE + 1];
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static int sysctl_kern_mprof(SYSCTL_HANDLER_ARGS);
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#endif
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static int sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS);
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/*
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* time_uptime of the last malloc(9) failure (induced or real).
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*/
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static time_t t_malloc_fail;
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#if defined(MALLOC_MAKE_FAILURES) || (MALLOC_DEBUG_MAXZONES > 1)
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SYSCTL_NODE(_debug, OID_AUTO, malloc, CTLFLAG_RD, 0,
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"Kernel malloc debugging options");
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#endif
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/*
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* malloc(9) fault injection -- cause malloc failures every (n) mallocs when
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* the caller specifies M_NOWAIT. If set to 0, no failures are caused.
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*/
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#ifdef MALLOC_MAKE_FAILURES
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static int malloc_failure_rate;
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static int malloc_nowait_count;
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static int malloc_failure_count;
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SYSCTL_INT(_debug_malloc, OID_AUTO, failure_rate, CTLFLAG_RW,
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&malloc_failure_rate, 0, "Every (n) mallocs with M_NOWAIT will fail");
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TUNABLE_INT("debug.malloc.failure_rate", &malloc_failure_rate);
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SYSCTL_INT(_debug_malloc, OID_AUTO, failure_count, CTLFLAG_RD,
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&malloc_failure_count, 0, "Number of imposed M_NOWAIT malloc failures");
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#endif
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static int
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sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS)
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{
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u_long size;
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size = kmem_map->size;
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return (sysctl_handle_long(oidp, &size, 0, req));
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}
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/*
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* malloc(9) uma zone separation -- sub-page buffer overruns in one
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* malloc type will affect only a subset of other malloc types.
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*/
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#if MALLOC_DEBUG_MAXZONES > 1
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static void
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tunable_set_numzones(void)
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{
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TUNABLE_INT_FETCH("debug.malloc.numzones",
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&numzones);
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/* Sanity check the number of malloc uma zones. */
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if (numzones <= 0)
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numzones = 1;
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if (numzones > MALLOC_DEBUG_MAXZONES)
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numzones = MALLOC_DEBUG_MAXZONES;
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}
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SYSINIT(numzones, SI_SUB_TUNABLES, SI_ORDER_ANY, tunable_set_numzones, NULL);
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SYSCTL_INT(_debug_malloc, OID_AUTO, numzones, CTLFLAG_RDTUN,
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&numzones, 0, "Number of malloc uma subzones");
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/*
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* Any number that changes regularly is an okay choice for the
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* offset. Build numbers are pretty good of you have them.
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*/
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static u_int zone_offset = __FreeBSD_version;
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TUNABLE_INT("debug.malloc.zone_offset", &zone_offset);
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SYSCTL_UINT(_debug_malloc, OID_AUTO, zone_offset, CTLFLAG_RDTUN,
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&zone_offset, 0, "Separate malloc types by examining the "
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"Nth character in the malloc type short description.");
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static u_int
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mtp_get_subzone(const char *desc)
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{
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size_t len;
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u_int val;
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if (desc == NULL || (len = strlen(desc)) == 0)
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return (0);
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val = desc[zone_offset % len];
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return (val % numzones);
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}
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#elif MALLOC_DEBUG_MAXZONES == 0
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#error "MALLOC_DEBUG_MAXZONES must be positive."
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#else
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static inline u_int
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mtp_get_subzone(const char *desc)
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{
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return (0);
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}
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#endif /* MALLOC_DEBUG_MAXZONES > 1 */
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int
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malloc_last_fail(void)
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{
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return (time_uptime - t_malloc_fail);
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}
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/*
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* An allocation has succeeded -- update malloc type statistics for the
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* amount of bucket size. Occurs within a critical section so that the
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* thread isn't preempted and doesn't migrate while updating per-PCU
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* statistics.
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*/
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static void
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malloc_type_zone_allocated(struct malloc_type *mtp, unsigned long size,
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int zindx)
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{
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struct malloc_type_internal *mtip;
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struct malloc_type_stats *mtsp;
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critical_enter();
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mtip = mtp->ks_handle;
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mtsp = &mtip->mti_stats[curcpu];
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if (size > 0) {
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mtsp->mts_memalloced += size;
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mtsp->mts_numallocs++;
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}
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if (zindx != -1)
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mtsp->mts_size |= 1 << zindx;
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#ifdef KDTRACE_HOOKS
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if (dtrace_malloc_probe != NULL) {
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uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_MALLOC];
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if (probe_id != 0)
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(dtrace_malloc_probe)(probe_id,
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(uintptr_t) mtp, (uintptr_t) mtip,
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(uintptr_t) mtsp, size, zindx);
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}
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#endif
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critical_exit();
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}
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void
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malloc_type_allocated(struct malloc_type *mtp, unsigned long size)
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{
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if (size > 0)
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malloc_type_zone_allocated(mtp, size, -1);
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}
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/*
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* A free operation has occurred -- update malloc type statistics for the
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* amount of the bucket size. Occurs within a critical section so that the
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* thread isn't preempted and doesn't migrate while updating per-CPU
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* statistics.
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*/
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void
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malloc_type_freed(struct malloc_type *mtp, unsigned long size)
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{
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struct malloc_type_internal *mtip;
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struct malloc_type_stats *mtsp;
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critical_enter();
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mtip = mtp->ks_handle;
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mtsp = &mtip->mti_stats[curcpu];
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mtsp->mts_memfreed += size;
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mtsp->mts_numfrees++;
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#ifdef KDTRACE_HOOKS
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if (dtrace_malloc_probe != NULL) {
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uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_FREE];
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if (probe_id != 0)
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(dtrace_malloc_probe)(probe_id,
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(uintptr_t) mtp, (uintptr_t) mtip,
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(uintptr_t) mtsp, size, 0);
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}
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#endif
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critical_exit();
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}
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/*
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* malloc:
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*
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* Allocate a block of memory.
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*
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* If M_NOWAIT is set, this routine will not block and return NULL if
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* the allocation fails.
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*/
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void *
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malloc(unsigned long size, struct malloc_type *mtp, int flags)
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{
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int indx;
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struct malloc_type_internal *mtip;
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caddr_t va;
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uma_zone_t zone;
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#if defined(DIAGNOSTIC) || defined(DEBUG_REDZONE)
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unsigned long osize = size;
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#endif
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#ifdef INVARIANTS
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KASSERT(mtp->ks_magic == M_MAGIC, ("malloc: bad malloc type magic"));
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/*
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* Check that exactly one of M_WAITOK or M_NOWAIT is specified.
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*/
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indx = flags & (M_WAITOK | M_NOWAIT);
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if (indx != M_NOWAIT && indx != M_WAITOK) {
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static struct timeval lasterr;
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static int curerr, once;
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if (once == 0 && ppsratecheck(&lasterr, &curerr, 1)) {
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printf("Bad malloc flags: %x\n", indx);
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kdb_backtrace();
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flags |= M_WAITOK;
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once++;
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}
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}
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#endif
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#ifdef MALLOC_MAKE_FAILURES
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if ((flags & M_NOWAIT) && (malloc_failure_rate != 0)) {
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atomic_add_int(&malloc_nowait_count, 1);
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if ((malloc_nowait_count % malloc_failure_rate) == 0) {
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atomic_add_int(&malloc_failure_count, 1);
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t_malloc_fail = time_uptime;
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return (NULL);
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}
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}
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#endif
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if (flags & M_WAITOK)
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KASSERT(curthread->td_intr_nesting_level == 0,
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("malloc(M_WAITOK) in interrupt context"));
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#ifdef DEBUG_MEMGUARD
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if (memguard_cmp(mtp, size)) {
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va = memguard_alloc(size, flags);
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if (va != NULL)
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return (va);
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/* This is unfortunate but should not be fatal. */
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}
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#endif
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#ifdef DEBUG_REDZONE
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size = redzone_size_ntor(size);
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#endif
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if (size <= KMEM_ZMAX) {
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mtip = mtp->ks_handle;
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if (size & KMEM_ZMASK)
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size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
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indx = kmemsize[size >> KMEM_ZSHIFT];
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KASSERT(mtip->mti_zone < numzones,
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("mti_zone %u out of range %d",
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mtip->mti_zone, numzones));
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zone = kmemzones[indx].kz_zone[mtip->mti_zone];
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#ifdef MALLOC_PROFILE
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krequests[size >> KMEM_ZSHIFT]++;
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#endif
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va = uma_zalloc(zone, flags);
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if (va != NULL)
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size = zone->uz_size;
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malloc_type_zone_allocated(mtp, va == NULL ? 0 : size, indx);
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} else {
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size = roundup(size, PAGE_SIZE);
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zone = NULL;
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va = uma_large_malloc(size, flags);
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malloc_type_allocated(mtp, va == NULL ? 0 : size);
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}
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if (flags & M_WAITOK)
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KASSERT(va != NULL, ("malloc(M_WAITOK) returned NULL"));
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else if (va == NULL)
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t_malloc_fail = time_uptime;
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#ifdef DIAGNOSTIC
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if (va != NULL && !(flags & M_ZERO)) {
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memset(va, 0x70, osize);
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}
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#endif
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#ifdef DEBUG_REDZONE
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if (va != NULL)
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va = redzone_setup(va, osize);
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#endif
|
|
return ((void *) va);
|
|
}
|
|
|
|
/*
|
|
* free:
|
|
*
|
|
* Free a block of memory allocated by malloc.
|
|
*
|
|
* This routine may not block.
|
|
*/
|
|
void
|
|
free(void *addr, struct malloc_type *mtp)
|
|
{
|
|
uma_slab_t slab;
|
|
u_long size;
|
|
|
|
KASSERT(mtp->ks_magic == M_MAGIC, ("free: bad malloc type magic"));
|
|
|
|
/* free(NULL, ...) does nothing */
|
|
if (addr == NULL)
|
|
return;
|
|
|
|
#ifdef DEBUG_MEMGUARD
|
|
if (is_memguard_addr(addr)) {
|
|
memguard_free(addr);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#ifdef DEBUG_REDZONE
|
|
redzone_check(addr);
|
|
addr = redzone_addr_ntor(addr);
|
|
#endif
|
|
|
|
slab = vtoslab((vm_offset_t)addr & (~UMA_SLAB_MASK));
|
|
|
|
if (slab == NULL)
|
|
panic("free: address %p(%p) has not been allocated.\n",
|
|
addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));
|
|
|
|
|
|
if (!(slab->us_flags & UMA_SLAB_MALLOC)) {
|
|
#ifdef INVARIANTS
|
|
struct malloc_type **mtpp = addr;
|
|
#endif
|
|
size = slab->us_keg->uk_size;
|
|
#ifdef INVARIANTS
|
|
/*
|
|
* Cache a pointer to the malloc_type that most recently freed
|
|
* this memory here. This way we know who is most likely to
|
|
* have stepped on it later.
|
|
*
|
|
* This code assumes that size is a multiple of 8 bytes for
|
|
* 64 bit machines
|
|
*/
|
|
mtpp = (struct malloc_type **)
|
|
((unsigned long)mtpp & ~UMA_ALIGN_PTR);
|
|
mtpp += (size - sizeof(struct malloc_type *)) /
|
|
sizeof(struct malloc_type *);
|
|
*mtpp = mtp;
|
|
#endif
|
|
uma_zfree_arg(LIST_FIRST(&slab->us_keg->uk_zones), addr, slab);
|
|
} else {
|
|
size = slab->us_size;
|
|
uma_large_free(slab);
|
|
}
|
|
malloc_type_freed(mtp, size);
|
|
}
|
|
|
|
/*
|
|
* realloc: change the size of a memory block
|
|
*/
|
|
void *
|
|
realloc(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
|
|
{
|
|
uma_slab_t slab;
|
|
unsigned long alloc;
|
|
void *newaddr;
|
|
|
|
KASSERT(mtp->ks_magic == M_MAGIC,
|
|
("realloc: bad malloc type magic"));
|
|
|
|
/* realloc(NULL, ...) is equivalent to malloc(...) */
|
|
if (addr == NULL)
|
|
return (malloc(size, mtp, flags));
|
|
|
|
/*
|
|
* XXX: Should report free of old memory and alloc of new memory to
|
|
* per-CPU stats.
|
|
*/
|
|
|
|
#ifdef DEBUG_MEMGUARD
|
|
if (is_memguard_addr(addr))
|
|
return (memguard_realloc(addr, size, mtp, flags));
|
|
#endif
|
|
|
|
#ifdef DEBUG_REDZONE
|
|
slab = NULL;
|
|
alloc = redzone_get_size(addr);
|
|
#else
|
|
slab = vtoslab((vm_offset_t)addr & ~(UMA_SLAB_MASK));
|
|
|
|
/* Sanity check */
|
|
KASSERT(slab != NULL,
|
|
("realloc: address %p out of range", (void *)addr));
|
|
|
|
/* Get the size of the original block */
|
|
if (!(slab->us_flags & UMA_SLAB_MALLOC))
|
|
alloc = slab->us_keg->uk_size;
|
|
else
|
|
alloc = slab->us_size;
|
|
|
|
/* Reuse the original block if appropriate */
|
|
if (size <= alloc
|
|
&& (size > (alloc >> REALLOC_FRACTION) || alloc == MINALLOCSIZE))
|
|
return (addr);
|
|
#endif /* !DEBUG_REDZONE */
|
|
|
|
/* Allocate a new, bigger (or smaller) block */
|
|
if ((newaddr = malloc(size, mtp, flags)) == NULL)
|
|
return (NULL);
|
|
|
|
/* Copy over original contents */
|
|
bcopy(addr, newaddr, min(size, alloc));
|
|
free(addr, mtp);
|
|
return (newaddr);
|
|
}
|
|
|
|
/*
|
|
* reallocf: same as realloc() but free memory on failure.
|
|
*/
|
|
void *
|
|
reallocf(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
|
|
{
|
|
void *mem;
|
|
|
|
if ((mem = realloc(addr, size, mtp, flags)) == NULL)
|
|
free(addr, mtp);
|
|
return (mem);
|
|
}
|
|
|
|
/*
|
|
* Initialize the kernel memory allocator
|
|
*/
|
|
/* ARGSUSED*/
|
|
static void
|
|
kmeminit(void *dummy)
|
|
{
|
|
uint8_t indx;
|
|
u_long mem_size, tmp;
|
|
int i;
|
|
|
|
mtx_init(&malloc_mtx, "malloc", NULL, MTX_DEF);
|
|
|
|
/*
|
|
* Try to auto-tune the kernel memory size, so that it is
|
|
* more applicable for a wider range of machine sizes.
|
|
* On an X86, a VM_KMEM_SIZE_SCALE value of 4 is good, while
|
|
* a VM_KMEM_SIZE of 12MB is a fair compromise. The
|
|
* VM_KMEM_SIZE_MAX is dependent on the maximum KVA space
|
|
* available, and on an X86 with a total KVA space of 256MB,
|
|
* try to keep VM_KMEM_SIZE_MAX at 80MB or below.
|
|
*
|
|
* Note that the kmem_map is also used by the zone allocator,
|
|
* so make sure that there is enough space.
|
|
*/
|
|
vm_kmem_size = VM_KMEM_SIZE + nmbclusters * PAGE_SIZE;
|
|
mem_size = cnt.v_page_count;
|
|
|
|
#if defined(VM_KMEM_SIZE_SCALE)
|
|
vm_kmem_size_scale = VM_KMEM_SIZE_SCALE;
|
|
#endif
|
|
TUNABLE_INT_FETCH("vm.kmem_size_scale", &vm_kmem_size_scale);
|
|
if (vm_kmem_size_scale > 0 &&
|
|
(mem_size / vm_kmem_size_scale) > (vm_kmem_size / PAGE_SIZE))
|
|
vm_kmem_size = (mem_size / vm_kmem_size_scale) * PAGE_SIZE;
|
|
|
|
#if defined(VM_KMEM_SIZE_MIN)
|
|
vm_kmem_size_min = VM_KMEM_SIZE_MIN;
|
|
#endif
|
|
TUNABLE_ULONG_FETCH("vm.kmem_size_min", &vm_kmem_size_min);
|
|
if (vm_kmem_size_min > 0 && vm_kmem_size < vm_kmem_size_min) {
|
|
vm_kmem_size = vm_kmem_size_min;
|
|
}
|
|
|
|
#if defined(VM_KMEM_SIZE_MAX)
|
|
vm_kmem_size_max = VM_KMEM_SIZE_MAX;
|
|
#endif
|
|
TUNABLE_ULONG_FETCH("vm.kmem_size_max", &vm_kmem_size_max);
|
|
if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max)
|
|
vm_kmem_size = vm_kmem_size_max;
|
|
|
|
/* Allow final override from the kernel environment */
|
|
TUNABLE_ULONG_FETCH("vm.kmem_size", &vm_kmem_size);
|
|
|
|
/*
|
|
* Limit kmem virtual size to twice the physical memory.
|
|
* This allows for kmem map sparseness, but limits the size
|
|
* to something sane. Be careful to not overflow the 32bit
|
|
* ints while doing the check.
|
|
*/
|
|
if (((vm_kmem_size / 2) / PAGE_SIZE) > cnt.v_page_count)
|
|
vm_kmem_size = 2 * cnt.v_page_count * PAGE_SIZE;
|
|
|
|
/*
|
|
* Tune settings based on the kmem map's size at this time.
|
|
*/
|
|
init_param3(vm_kmem_size / PAGE_SIZE);
|
|
|
|
#ifdef DEBUG_MEMGUARD
|
|
tmp = memguard_fudge(vm_kmem_size, vm_kmem_size_max);
|
|
#else
|
|
tmp = vm_kmem_size;
|
|
#endif
|
|
kmem_map = kmem_suballoc(kernel_map, &kmembase, &kmemlimit,
|
|
tmp, TRUE);
|
|
kmem_map->system_map = 1;
|
|
|
|
#ifdef DEBUG_MEMGUARD
|
|
/*
|
|
* Initialize MemGuard if support compiled in. MemGuard is a
|
|
* replacement allocator used for detecting tamper-after-free
|
|
* scenarios as they occur. It is only used for debugging.
|
|
*/
|
|
memguard_init(kmem_map);
|
|
#endif
|
|
|
|
uma_startup2();
|
|
|
|
mt_zone = uma_zcreate("mt_zone", sizeof(struct malloc_type_internal),
|
|
#ifdef INVARIANTS
|
|
mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
|
|
#else
|
|
NULL, NULL, NULL, NULL,
|
|
#endif
|
|
UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
|
|
for (i = 0, indx = 0; kmemzones[indx].kz_size != 0; indx++) {
|
|
int size = kmemzones[indx].kz_size;
|
|
char *name = kmemzones[indx].kz_name;
|
|
int subzone;
|
|
|
|
for (subzone = 0; subzone < numzones; subzone++) {
|
|
kmemzones[indx].kz_zone[subzone] =
|
|
uma_zcreate(name, size,
|
|
#ifdef INVARIANTS
|
|
mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
|
|
#else
|
|
NULL, NULL, NULL, NULL,
|
|
#endif
|
|
UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
|
|
}
|
|
for (;i <= size; i+= KMEM_ZBASE)
|
|
kmemsize[i >> KMEM_ZSHIFT] = indx;
|
|
|
|
}
|
|
}
|
|
|
|
void
|
|
malloc_init(void *data)
|
|
{
|
|
struct malloc_type_internal *mtip;
|
|
struct malloc_type *mtp;
|
|
|
|
KASSERT(cnt.v_page_count != 0, ("malloc_register before vm_init"));
|
|
|
|
mtp = data;
|
|
if (mtp->ks_magic != M_MAGIC)
|
|
panic("malloc_init: bad malloc type magic");
|
|
|
|
mtip = uma_zalloc(mt_zone, M_WAITOK | M_ZERO);
|
|
mtp->ks_handle = mtip;
|
|
mtip->mti_zone = mtp_get_subzone(mtp->ks_shortdesc);
|
|
|
|
mtx_lock(&malloc_mtx);
|
|
mtp->ks_next = kmemstatistics;
|
|
kmemstatistics = mtp;
|
|
kmemcount++;
|
|
mtx_unlock(&malloc_mtx);
|
|
}
|
|
|
|
void
|
|
malloc_uninit(void *data)
|
|
{
|
|
struct malloc_type_internal *mtip;
|
|
struct malloc_type_stats *mtsp;
|
|
struct malloc_type *mtp, *temp;
|
|
uma_slab_t slab;
|
|
long temp_allocs, temp_bytes;
|
|
int i;
|
|
|
|
mtp = data;
|
|
KASSERT(mtp->ks_magic == M_MAGIC,
|
|
("malloc_uninit: bad malloc type magic"));
|
|
KASSERT(mtp->ks_handle != NULL, ("malloc_deregister: cookie NULL"));
|
|
|
|
mtx_lock(&malloc_mtx);
|
|
mtip = mtp->ks_handle;
|
|
mtp->ks_handle = NULL;
|
|
if (mtp != kmemstatistics) {
|
|
for (temp = kmemstatistics; temp != NULL;
|
|
temp = temp->ks_next) {
|
|
if (temp->ks_next == mtp) {
|
|
temp->ks_next = mtp->ks_next;
|
|
break;
|
|
}
|
|
}
|
|
KASSERT(temp,
|
|
("malloc_uninit: type '%s' not found", mtp->ks_shortdesc));
|
|
} else
|
|
kmemstatistics = mtp->ks_next;
|
|
kmemcount--;
|
|
mtx_unlock(&malloc_mtx);
|
|
|
|
/*
|
|
* Look for memory leaks.
|
|
*/
|
|
temp_allocs = temp_bytes = 0;
|
|
for (i = 0; i < MAXCPU; i++) {
|
|
mtsp = &mtip->mti_stats[i];
|
|
temp_allocs += mtsp->mts_numallocs;
|
|
temp_allocs -= mtsp->mts_numfrees;
|
|
temp_bytes += mtsp->mts_memalloced;
|
|
temp_bytes -= mtsp->mts_memfreed;
|
|
}
|
|
if (temp_allocs > 0 || temp_bytes > 0) {
|
|
printf("Warning: memory type %s leaked memory on destroy "
|
|
"(%ld allocations, %ld bytes leaked).\n", mtp->ks_shortdesc,
|
|
temp_allocs, temp_bytes);
|
|
}
|
|
|
|
slab = vtoslab((vm_offset_t) mtip & (~UMA_SLAB_MASK));
|
|
uma_zfree_arg(mt_zone, mtip, slab);
|
|
}
|
|
|
|
struct malloc_type *
|
|
malloc_desc2type(const char *desc)
|
|
{
|
|
struct malloc_type *mtp;
|
|
|
|
mtx_assert(&malloc_mtx, MA_OWNED);
|
|
for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
|
|
if (strcmp(mtp->ks_shortdesc, desc) == 0)
|
|
return (mtp);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static int
|
|
sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct malloc_type_stream_header mtsh;
|
|
struct malloc_type_internal *mtip;
|
|
struct malloc_type_header mth;
|
|
struct malloc_type *mtp;
|
|
int error, i;
|
|
struct sbuf sbuf;
|
|
|
|
sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
|
|
mtx_lock(&malloc_mtx);
|
|
|
|
/*
|
|
* Insert stream header.
|
|
*/
|
|
bzero(&mtsh, sizeof(mtsh));
|
|
mtsh.mtsh_version = MALLOC_TYPE_STREAM_VERSION;
|
|
mtsh.mtsh_maxcpus = MAXCPU;
|
|
mtsh.mtsh_count = kmemcount;
|
|
(void)sbuf_bcat(&sbuf, &mtsh, sizeof(mtsh));
|
|
|
|
/*
|
|
* Insert alternating sequence of type headers and type statistics.
|
|
*/
|
|
for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
|
|
mtip = (struct malloc_type_internal *)mtp->ks_handle;
|
|
|
|
/*
|
|
* Insert type header.
|
|
*/
|
|
bzero(&mth, sizeof(mth));
|
|
strlcpy(mth.mth_name, mtp->ks_shortdesc, MALLOC_MAX_NAME);
|
|
(void)sbuf_bcat(&sbuf, &mth, sizeof(mth));
|
|
|
|
/*
|
|
* Insert type statistics for each CPU.
|
|
*/
|
|
for (i = 0; i < MAXCPU; i++) {
|
|
(void)sbuf_bcat(&sbuf, &mtip->mti_stats[i],
|
|
sizeof(mtip->mti_stats[i]));
|
|
}
|
|
}
|
|
mtx_unlock(&malloc_mtx);
|
|
error = sbuf_finish(&sbuf);
|
|
sbuf_delete(&sbuf);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, OID_AUTO, malloc_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
|
|
0, 0, sysctl_kern_malloc_stats, "s,malloc_type_ustats",
|
|
"Return malloc types");
|
|
|
|
SYSCTL_INT(_kern, OID_AUTO, malloc_count, CTLFLAG_RD, &kmemcount, 0,
|
|
"Count of kernel malloc types");
|
|
|
|
void
|
|
malloc_type_list(malloc_type_list_func_t *func, void *arg)
|
|
{
|
|
struct malloc_type *mtp, **bufmtp;
|
|
int count, i;
|
|
size_t buflen;
|
|
|
|
mtx_lock(&malloc_mtx);
|
|
restart:
|
|
mtx_assert(&malloc_mtx, MA_OWNED);
|
|
count = kmemcount;
|
|
mtx_unlock(&malloc_mtx);
|
|
|
|
buflen = sizeof(struct malloc_type *) * count;
|
|
bufmtp = malloc(buflen, M_TEMP, M_WAITOK);
|
|
|
|
mtx_lock(&malloc_mtx);
|
|
|
|
if (count < kmemcount) {
|
|
free(bufmtp, M_TEMP);
|
|
goto restart;
|
|
}
|
|
|
|
for (mtp = kmemstatistics, i = 0; mtp != NULL; mtp = mtp->ks_next, i++)
|
|
bufmtp[i] = mtp;
|
|
|
|
mtx_unlock(&malloc_mtx);
|
|
|
|
for (i = 0; i < count; i++)
|
|
(func)(bufmtp[i], arg);
|
|
|
|
free(bufmtp, M_TEMP);
|
|
}
|
|
|
|
#ifdef DDB
|
|
DB_SHOW_COMMAND(malloc, db_show_malloc)
|
|
{
|
|
struct malloc_type_internal *mtip;
|
|
struct malloc_type *mtp;
|
|
uint64_t allocs, frees;
|
|
uint64_t alloced, freed;
|
|
int i;
|
|
|
|
db_printf("%18s %12s %12s %12s\n", "Type", "InUse", "MemUse",
|
|
"Requests");
|
|
for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
|
|
mtip = (struct malloc_type_internal *)mtp->ks_handle;
|
|
allocs = 0;
|
|
frees = 0;
|
|
alloced = 0;
|
|
freed = 0;
|
|
for (i = 0; i < MAXCPU; i++) {
|
|
allocs += mtip->mti_stats[i].mts_numallocs;
|
|
frees += mtip->mti_stats[i].mts_numfrees;
|
|
alloced += mtip->mti_stats[i].mts_memalloced;
|
|
freed += mtip->mti_stats[i].mts_memfreed;
|
|
}
|
|
db_printf("%18s %12ju %12juK %12ju\n",
|
|
mtp->ks_shortdesc, allocs - frees,
|
|
(alloced - freed + 1023) / 1024, allocs);
|
|
}
|
|
}
|
|
|
|
#if MALLOC_DEBUG_MAXZONES > 1
|
|
DB_SHOW_COMMAND(multizone_matches, db_show_multizone_matches)
|
|
{
|
|
struct malloc_type_internal *mtip;
|
|
struct malloc_type *mtp;
|
|
u_int subzone;
|
|
|
|
if (!have_addr) {
|
|
db_printf("Usage: show multizone_matches <malloc type/addr>\n");
|
|
return;
|
|
}
|
|
mtp = (void *)addr;
|
|
if (mtp->ks_magic != M_MAGIC) {
|
|
db_printf("Magic %lx does not match expected %x\n",
|
|
mtp->ks_magic, M_MAGIC);
|
|
return;
|
|
}
|
|
|
|
mtip = mtp->ks_handle;
|
|
subzone = mtip->mti_zone;
|
|
|
|
for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
|
|
mtip = mtp->ks_handle;
|
|
if (mtip->mti_zone != subzone)
|
|
continue;
|
|
db_printf("%s\n", mtp->ks_shortdesc);
|
|
}
|
|
}
|
|
#endif /* MALLOC_DEBUG_MAXZONES > 1 */
|
|
#endif /* DDB */
|
|
|
|
#ifdef MALLOC_PROFILE
|
|
|
|
static int
|
|
sysctl_kern_mprof(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sbuf sbuf;
|
|
uint64_t count;
|
|
uint64_t waste;
|
|
uint64_t mem;
|
|
int error;
|
|
int rsize;
|
|
int size;
|
|
int i;
|
|
|
|
waste = 0;
|
|
mem = 0;
|
|
|
|
sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
|
|
sbuf_printf(&sbuf,
|
|
"\n Size Requests Real Size\n");
|
|
for (i = 0; i < KMEM_ZSIZE; i++) {
|
|
size = i << KMEM_ZSHIFT;
|
|
rsize = kmemzones[kmemsize[i]].kz_size;
|
|
count = (long long unsigned)krequests[i];
|
|
|
|
sbuf_printf(&sbuf, "%6d%28llu%11d\n", size,
|
|
(unsigned long long)count, rsize);
|
|
|
|
if ((rsize * count) > (size * count))
|
|
waste += (rsize * count) - (size * count);
|
|
mem += (rsize * count);
|
|
}
|
|
sbuf_printf(&sbuf,
|
|
"\nTotal memory used:\t%30llu\nTotal Memory wasted:\t%30llu\n",
|
|
(unsigned long long)mem, (unsigned long long)waste);
|
|
error = sbuf_finish(&sbuf);
|
|
sbuf_delete(&sbuf);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_OID(_kern, OID_AUTO, mprof, CTLTYPE_STRING|CTLFLAG_RD,
|
|
NULL, 0, sysctl_kern_mprof, "A", "Malloc Profiling");
|
|
#endif /* MALLOC_PROFILE */
|