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/*-
* Copyright (c) 2005 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/sysctl.h>
#include <vm/uma.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "memstat.h"
#include "memstat_internal.h"
/*
* Extract uma(9) statistics from the running kernel, and store all memory
* type information in the passed list. For each type, check the list for an
* existing entry with the right name/allocator -- if present, update that
* entry. Otherwise, add a new entry. On error, the entire list will be
* cleared, as entries will be in an inconsistent state.
*
* To reduce the level of work for a list that starts empty, we keep around a
* hint as to whether it was empty when we began, so we can avoid searching
* the list for entries to update. Updates are O(n^2) due to searching for
* each entry before adding it.
*/
int
memstat_sysctl_uma(struct memory_type_list *list, int flags)
{
struct uma_stream_header *ushp;
struct uma_type_header *uthp;
struct uma_percpu_stat *upsp;
struct memory_type *mtp;
int count, hint_dontsearch, i, j, maxcpus;
char *buffer, *p;
size_t size;
hint_dontsearch = LIST_EMPTY(&list->mtl_list);
/*
* Query the number of CPUs, number of malloc types so that we can
* guess an initial buffer size. We loop until we succeed or really
* fail. Note that the value of maxcpus we query using sysctl is not
* the version we use when processing the real data -- that is read
* from the header.
*/
retry:
size = sizeof(maxcpus);
if (sysctlbyname("kern.smp.maxcpus", &maxcpus, &size, NULL, 0) < 0) {
if (errno == EACCES || errno == EPERM)
list->mtl_error = MEMSTAT_ERROR_PERMISSION;
else
list->mtl_error = MEMSTAT_ERROR_DATAERROR;
return (-1);
}
if (size != sizeof(maxcpus)) {
list->mtl_error = MEMSTAT_ERROR_DATAERROR;
return (-1);
}
if (maxcpus > MEMSTAT_MAXCPU) {
list->mtl_error = MEMSTAT_ERROR_TOOMANYCPUS;
return (-1);
}
size = sizeof(count);
if (sysctlbyname("vm.zone_count", &count, &size, NULL, 0) < 0) {
if (errno == EACCES || errno == EPERM)
list->mtl_error = MEMSTAT_ERROR_PERMISSION;
else
list->mtl_error = MEMSTAT_ERROR_VERSION;
return (-1);
}
if (size != sizeof(count)) {
list->mtl_error = MEMSTAT_ERROR_DATAERROR;
return (-1);
}
size = sizeof(*uthp) + count * (sizeof(*uthp) + sizeof(*upsp) *
maxcpus);
buffer = malloc(size);
if (buffer == NULL) {
list->mtl_error = MEMSTAT_ERROR_NOMEMORY;
return (-1);
}
if (sysctlbyname("vm.zone_stats", buffer, &size, NULL, 0) < 0) {
/*
* XXXRW: ENOMEM is an ambiguous return, we should bound the
* number of loops, perhaps.
*/
if (errno == ENOMEM) {
free(buffer);
goto retry;
}
if (errno == EACCES || errno == EPERM)
list->mtl_error = MEMSTAT_ERROR_PERMISSION;
else
list->mtl_error = MEMSTAT_ERROR_VERSION;
free(buffer);
return (-1);
}
if (size == 0) {
free(buffer);
return (0);
}
if (size < sizeof(*ushp)) {
list->mtl_error = MEMSTAT_ERROR_VERSION;
free(buffer);
return (-1);
}
p = buffer;
ushp = (struct uma_stream_header *)p;
p += sizeof(*ushp);
if (ushp->ush_version != UMA_STREAM_VERSION) {
list->mtl_error = MEMSTAT_ERROR_VERSION;
free(buffer);
return (-1);
}
if (ushp->ush_maxcpus > MEMSTAT_MAXCPU) {
list->mtl_error = MEMSTAT_ERROR_TOOMANYCPUS;
free(buffer);
return (-1);
}
/*
* For the remainder of this function, we are quite trusting about
* the layout of structures and sizes, since we've determined we have
* a matching version and acceptable CPU count.
*/
maxcpus = ushp->ush_maxcpus;
count = ushp->ush_count;
for (i = 0; i < count; i++) {
uthp = (struct uma_type_header *)p;
p += sizeof(*uthp);
if (hint_dontsearch == 0) {
mtp = memstat_mtl_find(list, ALLOCATOR_UMA,
uthp->uth_name);
} else
mtp = NULL;
if (mtp == NULL)
mtp = _memstat_mt_allocate(list, ALLOCATOR_UMA,
uthp->uth_name);
if (mtp == NULL) {
memstat_mtl_free(list);
free(buffer);
list->mtl_error = MEMSTAT_ERROR_NOMEMORY;
return (-1);
}
/*
* Reset the statistics on a current node.
*/
_memstat_mt_reset_stats(mtp);
mtp->mt_numallocs = uthp->uth_allocs;
mtp->mt_numfrees = uthp->uth_frees;
mtp->mt_failures = uthp->uth_fails;
for (j = 0; j < maxcpus; j++) {
upsp = (struct uma_percpu_stat *)p;
p += sizeof(*upsp);
mtp->mt_percpu_cache[j].mtp_free =
upsp->ups_cache_free;
mtp->mt_free += upsp->ups_cache_free;
mtp->mt_numallocs += upsp->ups_allocs;
mtp->mt_numfrees += upsp->ups_frees;
}
mtp->mt_size = uthp->uth_size;
mtp->mt_memalloced = mtp->mt_numallocs * uthp->uth_size;
mtp->mt_memfreed = mtp->mt_numfrees * uthp->uth_size;
mtp->mt_bytes = mtp->mt_memalloced - mtp->mt_memfreed;
mtp->mt_countlimit = uthp->uth_limit;
mtp->mt_byteslimit = uthp->uth_limit * uthp->uth_size;
mtp->mt_count = mtp->mt_numallocs - mtp->mt_numfrees;
mtp->mt_zonefree = uthp->uth_zone_free;
mtp->mt_kegfree = uthp->uth_keg_free;
mtp->mt_free += mtp->mt_zonefree;
}
free(buffer);
return (0);
}
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