7150222c0a
Added description option to kstats. Added descriptions for zio_trim kstats PR: kern/173113 Submitted by: Steven Hartland Reviewed by: pjd Approved by: pjd MFC after: 2 weeks
132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/*-
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* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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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 AUTHORS 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 AUTHORS 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/sysctl.h>
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#include <sys/kstat.h>
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static MALLOC_DEFINE(M_KSTAT, "kstat_data", "Kernel statistics");
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SYSCTL_NODE(, OID_AUTO, kstat, CTLFLAG_RW, 0, "Kernel statistics");
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kstat_t *
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kstat_create(char *module, int instance, char *name, char *class, uchar_t type,
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ulong_t ndata, uchar_t flags)
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{
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struct sysctl_oid *root;
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kstat_t *ksp;
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KASSERT(instance == 0, ("instance=%d", instance));
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KASSERT(type == KSTAT_TYPE_NAMED, ("type=%hhu", type));
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KASSERT(flags == KSTAT_FLAG_VIRTUAL, ("flags=%02hhx", flags));
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/*
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* Allocate the main structure. We don't need to copy module/class/name
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* stuff in here, because it is only used for sysctl node creation
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* done in this function.
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*/
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ksp = malloc(sizeof(*ksp), M_KSTAT, M_WAITOK);
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ksp->ks_ndata = ndata;
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/*
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* Create sysctl tree for those statistics:
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*
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* kstat.<module>.<class>.<name>.
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*/
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sysctl_ctx_init(&ksp->ks_sysctl_ctx);
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root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx,
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SYSCTL_STATIC_CHILDREN(_kstat), OID_AUTO, module, CTLFLAG_RW, 0,
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"");
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if (root == NULL) {
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printf("%s: Cannot create kstat.%s tree!\n", __func__, module);
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sysctl_ctx_free(&ksp->ks_sysctl_ctx);
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free(ksp, M_KSTAT);
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return (NULL);
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}
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root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx, SYSCTL_CHILDREN(root),
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OID_AUTO, class, CTLFLAG_RW, 0, "");
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if (root == NULL) {
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printf("%s: Cannot create kstat.%s.%s tree!\n", __func__,
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module, class);
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sysctl_ctx_free(&ksp->ks_sysctl_ctx);
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free(ksp, M_KSTAT);
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return (NULL);
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}
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root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx, SYSCTL_CHILDREN(root),
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OID_AUTO, name, CTLFLAG_RW, 0, "");
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if (root == NULL) {
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printf("%s: Cannot create kstat.%s.%s.%s tree!\n", __func__,
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module, class, name);
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sysctl_ctx_free(&ksp->ks_sysctl_ctx);
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free(ksp, M_KSTAT);
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return (NULL);
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}
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ksp->ks_sysctl_root = root;
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return (ksp);
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}
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static int
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kstat_sysctl(SYSCTL_HANDLER_ARGS)
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{
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kstat_named_t *ksent = arg1;
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uint64_t val;
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val = ksent->value.ui64;
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return sysctl_handle_64(oidp, &val, 0, req);
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}
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void
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kstat_install(kstat_t *ksp)
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{
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kstat_named_t *ksent;
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u_int i;
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ksent = ksp->ks_data;
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for (i = 0; i < ksp->ks_ndata; i++, ksent++) {
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KASSERT(ksent->data_type == KSTAT_DATA_UINT64,
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("data_type=%d", ksent->data_type));
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SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
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SYSCTL_CHILDREN(ksp->ks_sysctl_root), OID_AUTO, ksent->name,
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CTLTYPE_U64 | CTLFLAG_RD, ksent, sizeof(*ksent),
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kstat_sysctl, "QU", ksent->desc);
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}
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}
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void
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kstat_delete(kstat_t *ksp)
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{
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sysctl_ctx_free(&ksp->ks_sysctl_ctx);
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free(ksp, M_KSTAT);
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}
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