476 lines
13 KiB
C
476 lines
13 KiB
C
/*-
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* Copyright (c) 2005-2006 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/cpuset.h>
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#include <sys/sysctl.h>
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#ifndef FSTACK
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#endif
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#include <vm/uma.h>
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#include <vm/uma_int.h>
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#include <err.h>
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#include <errno.h>
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#ifndef FSTACK
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#include <kvm.h>
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#endif
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#include <nlist.h>
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#include <stddef.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 <unistd.h>
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#include "memstat.h"
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#include "memstat_internal.h"
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#ifndef FSTACK
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static struct nlist namelist[] = {
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#define X_UMA_KEGS 0
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{ .n_name = "_uma_kegs" },
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#define X_MP_MAXID 1
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{ .n_name = "_mp_maxid" },
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#define X_ALL_CPUS 2
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{ .n_name = "_all_cpus" },
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{ .n_name = "" },
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};
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#endif
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/*
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* Extract uma(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_uma(struct memory_type_list *list, int flags)
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{
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struct uma_stream_header *ushp;
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struct uma_type_header *uthp;
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struct uma_percpu_stat *upsp;
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struct memory_type *mtp;
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int count, hint_dontsearch, i, j, maxcpus, maxid;
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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(maxid);
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if (sysctlbyname("kern.smp.maxid", &maxid, &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(maxid)) {
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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(count);
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if (sysctlbyname("vm.zone_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(*uthp) + count * (sizeof(*uthp) + sizeof(*upsp) *
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(maxid + 1));
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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("vm.zone_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(*ushp)) {
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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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ushp = (struct uma_stream_header *)p;
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p += sizeof(*ushp);
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if (ushp->ush_version != UMA_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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/*
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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 = ushp->ush_maxcpus;
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count = ushp->ush_count;
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for (i = 0; i < count; i++) {
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uthp = (struct uma_type_header *)p;
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p += sizeof(*uthp);
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if (hint_dontsearch == 0) {
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mtp = memstat_mtl_find(list, ALLOCATOR_UMA,
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uthp->uth_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_UMA,
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uthp->uth_name, maxid + 1);
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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, maxid + 1);
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mtp->mt_numallocs = uthp->uth_allocs;
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mtp->mt_numfrees = uthp->uth_frees;
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mtp->mt_failures = uthp->uth_fails;
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mtp->mt_sleeps = uthp->uth_sleeps;
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for (j = 0; j < maxcpus; j++) {
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upsp = (struct uma_percpu_stat *)p;
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p += sizeof(*upsp);
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mtp->mt_percpu_cache[j].mtp_free =
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upsp->ups_cache_free;
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mtp->mt_free += upsp->ups_cache_free;
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mtp->mt_numallocs += upsp->ups_allocs;
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mtp->mt_numfrees += upsp->ups_frees;
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}
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mtp->mt_size = uthp->uth_size;
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mtp->mt_rsize = uthp->uth_rsize;
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mtp->mt_memalloced = mtp->mt_numallocs * uthp->uth_size;
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mtp->mt_memfreed = mtp->mt_numfrees * uthp->uth_size;
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mtp->mt_bytes = mtp->mt_memalloced - mtp->mt_memfreed;
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mtp->mt_countlimit = uthp->uth_limit;
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mtp->mt_byteslimit = uthp->uth_limit * uthp->uth_size;
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mtp->mt_count = mtp->mt_numallocs - mtp->mt_numfrees;
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mtp->mt_zonefree = uthp->uth_zone_free;
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/*
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* UMA secondary zones share a keg with the primary zone. To
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* avoid double-reporting of free items, report keg free
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* items only in the primary zone.
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*/
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if (!(uthp->uth_zone_flags & UTH_ZONE_SECONDARY)) {
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mtp->mt_kegfree = uthp->uth_keg_free;
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mtp->mt_free += mtp->mt_kegfree;
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}
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mtp->mt_free += mtp->mt_zonefree;
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}
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free(buffer);
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return (0);
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}
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#ifndef FSTACK
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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, const 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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/*
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* memstat_kvm_uma() is similar to memstat_sysctl_uma(), only it extracts
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* UMA(9) statistics from a kernel core/memory file.
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*/
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int
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memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
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{
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LIST_HEAD(, uma_keg) uma_kegs;
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struct memory_type *mtp;
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struct uma_bucket *ubp, ub;
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struct uma_cache *ucp, *ucp_array;
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struct uma_zone *uzp, uz;
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struct uma_keg *kzp, kz;
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int hint_dontsearch, i, mp_maxid, ret;
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char name[MEMTYPE_MAXNAME];
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cpuset_t all_cpus;
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long cpusetsize;
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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_UMA_KEGS].n_type == 0 ||
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namelist[X_UMA_KEGS].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_MAXID, &mp_maxid, sizeof(mp_maxid), 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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ret = kread_symbol(kvm, X_UMA_KEGS, &uma_kegs, sizeof(uma_kegs), 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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cpusetsize = sysconf(_SC_CPUSET_SIZE);
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if (cpusetsize == -1 || (u_long)cpusetsize > sizeof(cpuset_t)) {
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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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CPU_ZERO(&all_cpus);
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ret = kread_symbol(kvm, X_ALL_CPUS, &all_cpus, cpusetsize, 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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ucp_array = malloc(sizeof(struct uma_cache) * (mp_maxid + 1));
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if (ucp_array == 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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for (kzp = LIST_FIRST(&uma_kegs); kzp != NULL; kzp =
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LIST_NEXT(&kz, uk_link)) {
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ret = kread(kvm, kzp, &kz, sizeof(kz), 0);
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if (ret != 0) {
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free(ucp_array);
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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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for (uzp = LIST_FIRST(&kz.uk_zones); uzp != NULL; uzp =
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LIST_NEXT(&uz, uz_link)) {
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ret = kread(kvm, uzp, &uz, sizeof(uz), 0);
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if (ret != 0) {
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free(ucp_array);
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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(kvm, uzp, ucp_array,
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sizeof(struct uma_cache) * (mp_maxid + 1),
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offsetof(struct uma_zone, uz_cpu[0]));
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if (ret != 0) {
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free(ucp_array);
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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, uz.uz_name, name,
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MEMTYPE_MAXNAME);
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if (ret != 0) {
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free(ucp_array);
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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_UMA,
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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_UMA,
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name, mp_maxid + 1);
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if (mtp == NULL) {
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free(ucp_array);
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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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* Reset the statistics on a current node.
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*/
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_memstat_mt_reset_stats(mtp, mp_maxid + 1);
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mtp->mt_numallocs = uz.uz_allocs;
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mtp->mt_numfrees = uz.uz_frees;
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mtp->mt_failures = uz.uz_fails;
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mtp->mt_sleeps = uz.uz_sleeps;
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if (kz.uk_flags & UMA_ZFLAG_INTERNAL)
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goto skip_percpu;
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for (i = 0; i < mp_maxid + 1; i++) {
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if (!CPU_ISSET(i, &all_cpus))
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continue;
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ucp = &ucp_array[i];
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mtp->mt_numallocs += ucp->uc_allocs;
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mtp->mt_numfrees += ucp->uc_frees;
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if (ucp->uc_allocbucket != NULL) {
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ret = kread(kvm, ucp->uc_allocbucket,
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&ub, sizeof(ub), 0);
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if (ret != 0) {
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free(ucp_array);
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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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mtp->mt_free += ub.ub_cnt;
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}
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if (ucp->uc_freebucket != NULL) {
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ret = kread(kvm, ucp->uc_freebucket,
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&ub, sizeof(ub), 0);
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if (ret != 0) {
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free(ucp_array);
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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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mtp->mt_free += ub.ub_cnt;
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}
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}
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skip_percpu:
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mtp->mt_size = kz.uk_size;
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mtp->mt_rsize = kz.uk_rsize;
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mtp->mt_memalloced = mtp->mt_numallocs * mtp->mt_size;
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mtp->mt_memfreed = mtp->mt_numfrees * mtp->mt_size;
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mtp->mt_bytes = mtp->mt_memalloced - mtp->mt_memfreed;
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if (kz.uk_ppera > 1)
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mtp->mt_countlimit = kz.uk_maxpages /
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kz.uk_ipers;
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else
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mtp->mt_countlimit = kz.uk_maxpages *
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kz.uk_ipers;
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mtp->mt_byteslimit = mtp->mt_countlimit * mtp->mt_size;
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mtp->mt_count = mtp->mt_numallocs - mtp->mt_numfrees;
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for (ubp = LIST_FIRST(&uz.uz_buckets); ubp !=
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NULL; ubp = LIST_NEXT(&ub, ub_link)) {
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ret = kread(kvm, ubp, &ub, sizeof(ub), 0);
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mtp->mt_zonefree += ub.ub_cnt;
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}
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if (!((kz.uk_flags & UMA_ZONE_SECONDARY) &&
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LIST_FIRST(&kz.uk_zones) != uzp)) {
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mtp->mt_kegfree = kz.uk_free;
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mtp->mt_free += mtp->mt_kegfree;
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}
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mtp->mt_free += mtp->mt_zonefree;
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}
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}
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free(ucp_array);
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return (0);
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}
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#endif
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