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ba23fa9bd8
so that libmemstat can be used to view full memory statistics from kernel core dumps and /dev/mem. This is provided via a new query function, memstat_kvm_malloc(), which is also automatically invoked by memstat_kvm_all(). A kvm handle must be passed in. This will allow malloc(9)-specific code to be removed from vmstat(8).
409 lines
11 KiB
C
409 lines
11 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/malloc.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 <kvm.h>
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#include <nlist.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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static struct nlist namelist[] = {
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#define X_KMEMSTATISTICS 0
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{ .n_name = "_kmemstatistics" },
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#define X_MP_MAXCPUS 1
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{ .n_name = "_mp_maxcpus" },
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{ .n_name = "" },
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};
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/*
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* Extract malloc(9) statistics from the running kernel, and store all memory
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* type information in the passed list. For each type, check the list for an
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* existing entry with the right name/allocator -- if present, update that
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* entry. Otherwise, add a new entry. On error, the entire list will be
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* cleared, as entries will be in an inconsistent state.
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*
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* To reduce the level of work for a list that starts empty, we keep around a
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* hint as to whether it was empty when we began, so we can avoid searching
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* the list for entries to update. Updates are O(n^2) due to searching for
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* each entry before adding it.
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*/
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int
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memstat_sysctl_malloc(struct memory_type_list *list, int flags)
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{
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struct malloc_type_stream_header *mtshp;
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struct malloc_type_header *mthp;
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struct malloc_type_stats *mtsp;
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struct memory_type *mtp;
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int count, hint_dontsearch, i, j, maxcpus;
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char *buffer, *p;
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size_t size;
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hint_dontsearch = LIST_EMPTY(&list->mtl_list);
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/*
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* Query the number of CPUs, number of malloc types so that we can
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* guess an initial buffer size. We loop until we succeed or really
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* fail. Note that the value of maxcpus we query using sysctl is not
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* the version we use when processing the real data -- that is read
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* from the header.
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*/
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retry:
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size = sizeof(maxcpus);
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if (sysctlbyname("kern.smp.maxcpus", &maxcpus, &size, NULL, 0) < 0) {
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if (errno == EACCES || errno == EPERM)
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list->mtl_error = MEMSTAT_ERROR_PERMISSION;
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else
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list->mtl_error = MEMSTAT_ERROR_DATAERROR;
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return (-1);
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}
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if (size != sizeof(maxcpus)) {
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list->mtl_error = MEMSTAT_ERROR_DATAERROR;
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return (-1);
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}
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if (maxcpus > MEMSTAT_MAXCPU) {
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list->mtl_error = MEMSTAT_ERROR_TOOMANYCPUS;
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return (-1);
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}
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size = sizeof(count);
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if (sysctlbyname("kern.malloc_count", &count, &size, NULL, 0) < 0) {
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if (errno == EACCES || errno == EPERM)
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list->mtl_error = MEMSTAT_ERROR_PERMISSION;
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else
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list->mtl_error = MEMSTAT_ERROR_VERSION;
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return (-1);
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}
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if (size != sizeof(count)) {
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list->mtl_error = MEMSTAT_ERROR_DATAERROR;
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return (-1);
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}
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size = sizeof(*mthp) + count * (sizeof(*mthp) + sizeof(*mtsp) *
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maxcpus);
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buffer = malloc(size);
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if (buffer == NULL) {
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list->mtl_error = MEMSTAT_ERROR_NOMEMORY;
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return (-1);
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}
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if (sysctlbyname("kern.malloc_stats", buffer, &size, NULL, 0) < 0) {
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/*
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* XXXRW: ENOMEM is an ambiguous return, we should bound the
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* number of loops, perhaps.
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*/
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if (errno == ENOMEM) {
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free(buffer);
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goto retry;
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}
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if (errno == EACCES || errno == EPERM)
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list->mtl_error = MEMSTAT_ERROR_PERMISSION;
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else
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list->mtl_error = MEMSTAT_ERROR_VERSION;
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free(buffer);
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return (-1);
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}
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if (size == 0) {
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free(buffer);
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return (0);
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}
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if (size < sizeof(*mtshp)) {
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list->mtl_error = MEMSTAT_ERROR_VERSION;
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free(buffer);
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return (-1);
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}
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p = buffer;
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mtshp = (struct malloc_type_stream_header *)p;
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p += sizeof(*mtshp);
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if (mtshp->mtsh_version != MALLOC_TYPE_STREAM_VERSION) {
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list->mtl_error = MEMSTAT_ERROR_VERSION;
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free(buffer);
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return (-1);
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}
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if (mtshp->mtsh_maxcpus > MEMSTAT_MAXCPU) {
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list->mtl_error = MEMSTAT_ERROR_TOOMANYCPUS;
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free(buffer);
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return (-1);
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}
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/*
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* For the remainder of this function, we are quite trusting about
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* the layout of structures and sizes, since we've determined we have
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* a matching version and acceptable CPU count.
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*/
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maxcpus = mtshp->mtsh_maxcpus;
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count = mtshp->mtsh_count;
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for (i = 0; i < count; i++) {
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mthp = (struct malloc_type_header *)p;
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p += sizeof(*mthp);
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if (hint_dontsearch == 0) {
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mtp = memstat_mtl_find(list, ALLOCATOR_MALLOC,
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mthp->mth_name);
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} else
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mtp = NULL;
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if (mtp == NULL)
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mtp = _memstat_mt_allocate(list, ALLOCATOR_MALLOC,
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mthp->mth_name);
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if (mtp == NULL) {
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_memstat_mtl_empty(list);
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free(buffer);
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list->mtl_error = MEMSTAT_ERROR_NOMEMORY;
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return (-1);
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}
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/*
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* Reset the statistics on a current node.
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*/
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_memstat_mt_reset_stats(mtp);
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for (j = 0; j < maxcpus; j++) {
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mtsp = (struct malloc_type_stats *)p;
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p += sizeof(*mtsp);
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/*
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* Sumarize raw statistics across CPUs into coalesced
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* statistics.
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*/
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mtp->mt_memalloced += mtsp->mts_memalloced;
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mtp->mt_memfreed += mtsp->mts_memfreed;
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mtp->mt_numallocs += mtsp->mts_numallocs;
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mtp->mt_numfrees += mtsp->mts_numfrees;
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mtp->mt_sizemask |= mtsp->mts_size;
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/*
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* Copies of per-CPU statistics.
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*/
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mtp->mt_percpu_alloc[j].mtp_memalloced =
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mtsp->mts_memalloced;
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mtp->mt_percpu_alloc[j].mtp_memfreed =
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mtsp->mts_memfreed;
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mtp->mt_percpu_alloc[j].mtp_numallocs =
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mtsp->mts_numallocs;
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mtp->mt_percpu_alloc[j].mtp_numfrees =
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mtsp->mts_numfrees;
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mtp->mt_percpu_alloc[j].mtp_sizemask =
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mtsp->mts_size;
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}
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/*
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* Derived cross-CPU statistics.
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*/
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mtp->mt_bytes = mtp->mt_memalloced - mtp->mt_memfreed;
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mtp->mt_count = mtp->mt_numallocs - mtp->mt_numfrees;
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}
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free(buffer);
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return (0);
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}
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static int
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kread(kvm_t *kvm, void *kvm_pointer, void *address, size_t size,
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size_t offset)
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{
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ssize_t ret;
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ret = kvm_read(kvm, (unsigned long)kvm_pointer + offset, address,
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size);
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if (ret < 0)
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return (MEMSTAT_ERROR_KVM);
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if ((size_t)ret != size)
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return (MEMSTAT_ERROR_KVM_SHORTREAD);
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return (0);
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}
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static int
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kread_string(kvm_t *kvm, void *kvm_pointer, char *buffer, int buflen)
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{
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ssize_t ret;
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int i;
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for (i = 0; i < buflen; i++) {
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ret = kvm_read(kvm, (unsigned long)kvm_pointer + i,
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&(buffer[i]), sizeof(char));
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if (ret < 0)
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return (MEMSTAT_ERROR_KVM);
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if ((size_t)ret != sizeof(char))
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return (MEMSTAT_ERROR_KVM_SHORTREAD);
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if (buffer[i] == '\0')
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return (0);
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}
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/* Truncate. */
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buffer[i-1] = '\0';
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return (0);
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}
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static int
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kread_symbol(kvm_t *kvm, int index, void *address, size_t size,
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size_t offset)
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{
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ssize_t ret;
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ret = kvm_read(kvm, namelist[index].n_value + offset, address, size);
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if (ret < 0)
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return (MEMSTAT_ERROR_KVM);
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if ((size_t)ret != size)
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return (MEMSTAT_ERROR_KVM_SHORTREAD);
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return (0);
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}
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int
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memstat_kvm_malloc(struct memory_type_list *list, void *kvm_handle)
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{
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struct memory_type *mtp;
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void *kmemstatistics;
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int hint_dontsearch, j, mp_maxcpus, ret;
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char name[MEMTYPE_MAXNAME];
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struct malloc_type_stats mts[MEMSTAT_MAXCPU], *mtsp;
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struct malloc_type type, *typep;
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kvm_t *kvm;
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kvm = (kvm_t *)kvm_handle;
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hint_dontsearch = LIST_EMPTY(&list->mtl_list);
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if (kvm_nlist(kvm, namelist) != 0) {
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list->mtl_error = MEMSTAT_ERROR_KVM;
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return (-1);
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}
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if (namelist[X_KMEMSTATISTICS].n_type == 0 ||
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namelist[X_KMEMSTATISTICS].n_value == 0) {
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list->mtl_error = MEMSTAT_ERROR_KVM_NOSYMBOL;
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return (-1);
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}
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ret = kread_symbol(kvm, X_MP_MAXCPUS, &mp_maxcpus,
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sizeof(mp_maxcpus), 0);
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if (ret != 0) {
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list->mtl_error = ret;
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return (-1);
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}
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if (mp_maxcpus > MEMSTAT_MAXCPU) {
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list->mtl_error = MEMSTAT_ERROR_TOOMANYCPUS;
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return (-1);
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}
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ret = kread_symbol(kvm, X_KMEMSTATISTICS, &kmemstatistics,
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sizeof(kmemstatistics), 0);
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if (ret != 0) {
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list->mtl_error = ret;
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return (-1);
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}
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for (typep = kmemstatistics; typep != NULL; typep = type.ks_next) {
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ret = kread(kvm, typep, &type, sizeof(type), 0);
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if (ret != 0) {
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_memstat_mtl_empty(list);
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list->mtl_error = ret;
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return (-1);
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}
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ret = kread_string(kvm, (void *)type.ks_shortdesc, name,
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MEMTYPE_MAXNAME);
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if (ret != 0) {
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_memstat_mtl_empty(list);
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list->mtl_error = ret;
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return (-1);
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}
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/*
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* Take advantage of explicit knowledge that
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* malloc_type_internal is simply an array of statistics
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* structures of number MAXCPU. Since our compile-time
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* value for MAXCPU may differ from the kernel's, we
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* populate our own array.
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*/
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ret = kread(kvm, type.ks_handle, mts, mp_maxcpus *
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sizeof(struct malloc_type_stats), 0);
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if (ret != 0) {
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_memstat_mtl_empty(list);
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list->mtl_error = ret;
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return (-1);
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}
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if (hint_dontsearch == 0) {
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mtp = memstat_mtl_find(list, ALLOCATOR_MALLOC, name);
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} else
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mtp = NULL;
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if (mtp == NULL)
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mtp = _memstat_mt_allocate(list, ALLOCATOR_MALLOC,
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name);
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if (mtp == NULL) {
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_memstat_mtl_empty(list);
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list->mtl_error = MEMSTAT_ERROR_NOMEMORY;
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return (-1);
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}
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/*
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* This logic is replicated from kern_malloc.c, and should
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* be kept in sync.
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*/
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_memstat_mt_reset_stats(mtp);
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for (j = 0; j < mp_maxcpus; j++) {
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mtsp = &mts[j];
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mtp->mt_memalloced += mtsp->mts_memalloced;
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mtp->mt_memfreed += mtsp->mts_memfreed;
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mtp->mt_numallocs += mtsp->mts_numallocs;
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mtp->mt_numfrees += mtsp->mts_numfrees;
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mtp->mt_sizemask |= mtsp->mts_size;
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mtp->mt_percpu_alloc[j].mtp_memalloced =
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mtsp->mts_memalloced;
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mtp->mt_percpu_alloc[j].mtp_memfreed =
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mtsp->mts_memfreed;
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mtp->mt_percpu_alloc[j].mtp_numallocs =
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mtsp->mts_numallocs;
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mtp->mt_percpu_alloc[j].mtp_numfrees =
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mtsp->mts_numfrees;
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mtp->mt_percpu_alloc[j].mtp_sizemask =
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mtsp->mts_size;
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}
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mtp->mt_bytes = mtp->mt_memalloced - mtp->mt_memfreed;
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mtp->mt_count = mtp->mt_numallocs - mtp->mt_numfrees;
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}
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return (0);
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}
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