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345628080d
- Define a set of libmemstat(3) error constants, which are used by all libmemstat(3) methods except for memstat_mtl_alloc(), which allocates a memory type list and may return ENOMEM via errno. - Define a per-memory_type_list current error value, which is set when a call associated with a memory list fails. This requires wrapping a structure around the queue(9) list head data structure, but this change is not visible to libmemstat(3) consumers due to using access methods. - Add a new accessor method, memstat_mtl_geterror() to retrieve the error number. - Consistently set the error number in a number of failure modes where previously some combination of setting errno and printf'ing error descriptions was used. libmemstat(3) will now no longer print to stdio under any circumstances. Returns of NULL/-1 for errors remain the same. This avoids use of stdio, misuse of error numbers, and should make it easier to program a libmemstat(3) consumer able to print useful error messages. Currently, no error-to-string function is provided, as I'm unsure how to address internationalization concerns. MFC after: 1 day
388 lines
7.7 KiB
C
388 lines
7.7 KiB
C
/*-
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* Copyright (c) 2005 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "memstat.h"
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#include "memstat_internal.h"
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struct memory_type_list *
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memstat_mtl_alloc(void)
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{
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struct memory_type_list *mtlp;
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mtlp = malloc(sizeof(*mtlp));
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if (mtlp == NULL)
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return (NULL);
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LIST_INIT(&mtlp->mtl_list);
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mtlp->mtl_error = MEMSTAT_ERROR_UNDEFINED;
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return (mtlp);
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}
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struct memory_type *
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memstat_mtl_first(struct memory_type_list *list)
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{
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return (LIST_FIRST(&list->mtl_list));
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}
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struct memory_type *
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memstat_mtl_next(struct memory_type *mtp)
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{
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return (LIST_NEXT(mtp, mt_list));
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}
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void
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memstat_mtl_free(struct memory_type_list *list)
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{
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struct memory_type *mtp;
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while ((mtp = LIST_FIRST(&list->mtl_list))) {
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LIST_REMOVE(mtp, mt_list);
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free(mtp);
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}
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free(list);
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}
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int
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memstat_mtl_geterror(struct memory_type_list *list)
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{
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return (list->mtl_error);
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}
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/*
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* Look for an existing memory_type entry in a memory_type list, based on the
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* allocator and name of the type. If not found, return NULL. No errno or
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* memstat error.
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*/
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struct memory_type *
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memstat_mtl_find(struct memory_type_list *list, int allocator,
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const char *name)
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{
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struct memory_type *mtp;
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LIST_FOREACH(mtp, &list->mtl_list, mt_list) {
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if ((mtp->mt_allocator == allocator ||
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allocator == ALLOCATOR_ANY) &&
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strcmp(mtp->mt_name, name) == 0)
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return (mtp);
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}
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return (NULL);
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}
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/*
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* Allocate a new memory_type with the specificed allocator type and name,
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* then insert into the list. The structure will be zero'd.
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*
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* libmemstat(3) internal function.
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*/
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struct memory_type *
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_memstat_mt_allocate(struct memory_type_list *list, int allocator,
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const char *name)
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{
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struct memory_type *mtp;
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mtp = malloc(sizeof(*mtp));
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if (mtp == NULL)
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return (NULL);
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bzero(mtp, sizeof(*mtp));
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mtp->mt_allocator = allocator;
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strlcpy(mtp->mt_name, name, MEMTYPE_MAXNAME);
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LIST_INSERT_HEAD(&list->mtl_list, mtp, mt_list);
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return (mtp);
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}
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/*
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* Reset any libmemstat(3)-owned statistics in a memory_type record so that
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* it can be reused without incremental addition problems. Caller-owned
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* memory is left "as-is", and must be updated by the caller if desired.
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*
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* libmemstat(3) internal function.
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*/
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void
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_memstat_mt_reset_stats(struct memory_type *mtp)
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{
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int i;
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mtp->mt_countlimit = 0;
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mtp->mt_byteslimit = 0;
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mtp->mt_sizemask = 0;
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mtp->mt_size = 0;
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mtp->mt_memalloced = 0;
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mtp->mt_memfreed = 0;
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mtp->mt_numallocs = 0;
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mtp->mt_numfrees = 0;
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mtp->mt_bytes = 0;
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mtp->mt_count = 0;
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mtp->mt_free = 0;
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mtp->mt_failures = 0;
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mtp->mt_zonefree = 0;
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mtp->mt_kegfree = 0;
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for (i = 0; i < MEMSTAT_MAXCPU; i++) {
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mtp->mt_percpu_alloc[i].mtp_memalloced = 0;
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mtp->mt_percpu_alloc[i].mtp_memfreed = 0;
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mtp->mt_percpu_alloc[i].mtp_numallocs = 0;
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mtp->mt_percpu_alloc[i].mtp_numfrees = 0;
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mtp->mt_percpu_alloc[i].mtp_sizemask = 0;
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mtp->mt_percpu_cache[i].mtp_free = 0;
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}
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}
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/*
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* Accessor methods for struct memory_type. Avoids encoding the structure
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* ABI into the application.
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*/
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const char *
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memstat_get_name(const struct memory_type *mtp)
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{
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return (mtp->mt_name);
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}
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int
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memstat_get_allocator(const struct memory_type *mtp)
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{
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return (mtp->mt_allocator);
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}
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uint64_t
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memstat_get_countlimit(const struct memory_type *mtp)
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{
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return (mtp->mt_countlimit);
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}
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uint64_t
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memstat_get_byteslimit(const struct memory_type *mtp)
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{
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return (mtp->mt_byteslimit);
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}
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uint64_t
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memstat_get_sizemask(const struct memory_type *mtp)
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{
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return (mtp->mt_sizemask);
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}
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uint64_t
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memstat_get_size(const struct memory_type *mtp)
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{
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return (mtp->mt_size);
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}
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uint64_t
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memstat_get_memalloced(const struct memory_type *mtp)
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{
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return (mtp->mt_memalloced);
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}
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uint64_t
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memstat_get_memfreed(const struct memory_type *mtp)
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{
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return (mtp->mt_memfreed);
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}
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uint64_t
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memstat_get_numallocs(const struct memory_type *mtp)
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{
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return (mtp->mt_numallocs);
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}
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uint64_t
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memstat_get_numfrees(const struct memory_type *mtp)
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{
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return (mtp->mt_numfrees);
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}
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uint64_t
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memstat_get_bytes(const struct memory_type *mtp)
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{
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return (mtp->mt_bytes);
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}
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uint64_t
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memstat_get_count(const struct memory_type *mtp)
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{
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return (mtp->mt_count);
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}
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uint64_t
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memstat_get_free(const struct memory_type *mtp)
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{
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return (mtp->mt_free);
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}
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uint64_t
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memstat_get_failures(const struct memory_type *mtp)
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{
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return (mtp->mt_failures);
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}
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void *
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memstat_get_caller_pointer(const struct memory_type *mtp, int index)
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{
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return (mtp->mt_caller_pointer[index]);
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}
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void
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memstat_set_caller_pointer(struct memory_type *mtp, int index, void *value)
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{
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mtp->mt_caller_pointer[index] = value;
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}
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uint64_t
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memstat_get_caller_uint64(const struct memory_type *mtp, int index)
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{
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return (mtp->mt_caller_uint64[index]);
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}
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void
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memstat_set_caller_uint64(struct memory_type *mtp, int index, uint64_t value)
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{
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mtp->mt_caller_uint64[index] = value;
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}
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uint64_t
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memstat_get_zonefree(const struct memory_type *mtp)
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{
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return (mtp->mt_zonefree);
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}
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uint64_t
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memstat_get_kegfree(const struct memory_type *mtp)
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{
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return (mtp->mt_kegfree);
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}
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uint64_t
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memstat_get_percpu_memalloced(const struct memory_type *mtp, int cpu)
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{
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return (mtp->mt_percpu_alloc[cpu].mtp_memalloced);
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}
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uint64_t
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memstat_get_percpu_memfreed(const struct memory_type *mtp, int cpu)
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{
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return (mtp->mt_percpu_alloc[cpu].mtp_memfreed);
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}
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uint64_t
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memstat_get_percpu_numallocs(const struct memory_type *mtp, int cpu)
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{
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return (mtp->mt_percpu_alloc[cpu].mtp_numallocs);
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}
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uint64_t
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memstat_get_percpu_numfrees(const struct memory_type *mtp, int cpu)
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{
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return (mtp->mt_percpu_alloc[cpu].mtp_numfrees);
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}
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uint64_t
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memstat_get_percpu_sizemask(const struct memory_type *mtp, int cpu)
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{
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return (mtp->mt_percpu_alloc[cpu].mtp_sizemask);
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}
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void *
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memstat_get_percpu_caller_pointer(const struct memory_type *mtp, int cpu,
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int index)
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{
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return (mtp->mt_percpu_alloc[cpu].mtp_caller_pointer[index]);
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}
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void
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memstat_set_percpu_caller_pointer(struct memory_type *mtp, int cpu,
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int index, void *value)
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{
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mtp->mt_percpu_alloc[cpu].mtp_caller_pointer[index] = value;
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}
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uint64_t
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memstat_get_percpu_caller_uint64(const struct memory_type *mtp, int cpu,
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int index)
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{
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return (mtp->mt_percpu_alloc[cpu].mtp_caller_uint64[index]);
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}
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void
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memstat_set_percpu_caller_uint64(struct memory_type *mtp, int cpu, int index,
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uint64_t value)
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{
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mtp->mt_percpu_alloc[cpu].mtp_caller_uint64[index] = value;
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}
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uint64_t
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memstat_get_percpu_free(const struct memory_type *mtp, int cpu)
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{
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return (mtp->mt_percpu_cache[cpu].mtp_free);
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}
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