2 * Copyright (c) 2005 Robert N. M. Watson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * Number of CPU slots in library-internal data structures. This should be
34 * at least the value of MAXCPU from param.h.
36 #define MEMSTAT_MAXCPU 32
39 * Amount of caller data to maintain for each caller data slot. Applications
40 * must not request more than this number of caller save data, or risk
41 * corrupting internal libmemstat(3) data structures. A compile time check
42 * in the application is probably appropriate.
44 #define MEMSTAT_MAXCALLER 16
47 * libmemstat(3) is able to extract memory data from different allocators;
48 * when it does so, it tags which allocator it got the data from so that
49 * consumers can determine which fields are usable, as data returned varies
52 #define ALLOCATOR_UNKNOWN 0
53 #define ALLOCATOR_MALLOC 1
54 #define ALLOCATOR_UMA 2
55 #define ALLOCATOR_ANY 255
58 * Library maximum type name. Should be max(set of name maximums over
59 * various allocators).
61 #define MEMTYPE_MAXNAME 32
64 * Library error conditions, mostly from the underlying data sources. On
65 * failure, functions typically return (-1) or (NULL); on success, (0) or a
66 * valid data pointer. The error from the last operation is stored in
67 * struct memory_type, and accessed via memstat_get_error(mtp).
69 #define MEMSTAT_ERROR_UNDEFINED 0 /* Initialization value. */
70 #define MEMSTAT_ERROR_NOMEMORY 1 /* Out of memory. */
71 #define MEMSTAT_ERROR_VERSION 2 /* Unsupported version. */
72 #define MEMSTAT_ERROR_PERMISSION 3 /* Permission denied. */
73 #define MEMSTAT_ERROR_TOOMANYCPUS 4 /* Too many CPUs. */
74 #define MEMSTAT_ERROR_DATAERROR 5 /* Error in stat data. */
75 #define MEMSTAT_ERROR_KVM 6 /* See kvm_geterr() for err. */
76 #define MEMSTAT_ERROR_KVM_NOSYMBOL 7 /* Symbol not available. */
77 #define MEMSTAT_ERROR_KVM_SHORTREAD 8 /* Short kvm_read return. */
80 * Forward declare struct memory_type, which holds per-type properties and
81 * statistics. This is an opaque type, to be frobbed only from within the
82 * library, in order to avoid building ABI assumptions into the application.
83 * Accessor methods should be used to get and sometimes set the fields from
84 * consumers of the library.
89 * struct memory_type_list is the head of a list of memory types and
92 struct memory_type_list;
96 * Functions that operate without memory type or memory type list context.
98 const char *memstat_strerror(int error);
101 * Functions for managing memory type and statistics data.
103 struct memory_type_list *memstat_mtl_alloc(void);
104 struct memory_type *memstat_mtl_first(struct memory_type_list *list);
105 struct memory_type *memstat_mtl_next(struct memory_type *mtp);
106 struct memory_type *memstat_mtl_find(struct memory_type_list *list,
107 int allocator, const char *name);
108 void memstat_mtl_free(struct memory_type_list *list);
109 int memstat_mtl_geterror(struct memory_type_list *list);
112 * Functions to retrieve data from a live kernel using sysctl.
114 int memstat_sysctl_all(struct memory_type_list *list, int flags);
115 int memstat_sysctl_malloc(struct memory_type_list *list, int flags);
116 int memstat_sysctl_uma(struct memory_type_list *list, int flags);
119 * Functions to retrieve data from a kernel core (or /dev/kmem).
121 int memstat_kvm_all(struct memory_type_list *list, void *kvm_handle);
122 int memstat_kvm_malloc(struct memory_type_list *list, void *kvm_handle);
123 int memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle);
126 * Accessor methods for struct memory_type.
128 const char *memstat_get_name(const struct memory_type *mtp);
129 int memstat_get_allocator(const struct memory_type *mtp);
130 uint64_t memstat_get_countlimit(const struct memory_type *mtp);
131 uint64_t memstat_get_byteslimit(const struct memory_type *mtp);
132 uint64_t memstat_get_sizemask(const struct memory_type *mtp);
133 uint64_t memstat_get_size(const struct memory_type *mtp);
134 uint64_t memstat_get_memalloced(const struct memory_type *mtp);
135 uint64_t memstat_get_memfreed(const struct memory_type *mtp);
136 uint64_t memstat_get_numallocs(const struct memory_type *mtp);
137 uint64_t memstat_get_numfrees(const struct memory_type *mtp);
138 uint64_t memstat_get_bytes(const struct memory_type *mtp);
139 uint64_t memstat_get_count(const struct memory_type *mtp);
140 uint64_t memstat_get_free(const struct memory_type *mtp);
141 uint64_t memstat_get_failures(const struct memory_type *mtp);
142 void *memstat_get_caller_pointer(const struct memory_type *mtp,
144 void memstat_set_caller_pointer(struct memory_type *mtp,
145 int index, void *value);
146 uint64_t memstat_get_caller_uint64(const struct memory_type *mtp,
148 void memstat_set_caller_uint64(struct memory_type *mtp, int index,
150 uint64_t memstat_get_zonefree(const struct memory_type *mtp);
151 uint64_t memstat_get_kegfree(const struct memory_type *mtp);
152 uint64_t memstat_get_percpu_memalloced(const struct memory_type *mtp,
154 uint64_t memstat_get_percpu_memfreed(const struct memory_type *mtp,
156 uint64_t memstat_get_percpu_numallocs(const struct memory_type *mtp,
158 uint64_t memstat_get_percpu_numfrees(const struct memory_type *mtp,
160 uint64_t memstat_get_percpu_sizemask(const struct memory_type *mtp,
162 void *memstat_get_percpu_caller_pointer(
163 const struct memory_type *mtp, int cpu, int index);
164 void memstat_set_percpu_caller_pointer(struct memory_type *mtp,
165 int cpu, int index, void *value);
166 uint64_t memstat_get_percpu_caller_uint64(
167 const struct memory_type *mtp, int cpu, int index);
168 void memstat_set_percpu_caller_uint64(struct memory_type *mtp,
169 int cpu, int index, uint64_t value);
170 uint64_t memstat_get_percpu_free(const struct memory_type *mtp,
174 #endif /* !_MEMSTAT_H_ */