96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#include <sys/zfs_context.h>
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list_t zfs_dbgmsgs;
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int zfs_dbgmsg_size;
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kmutex_t zfs_dbgmsgs_lock;
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int zfs_dbgmsg_maxsize = 1<<20; /* 1MB */
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void
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zfs_dbgmsg_init(void)
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{
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list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t),
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offsetof(zfs_dbgmsg_t, zdm_node));
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mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL);
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}
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void
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zfs_dbgmsg_fini(void)
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{
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zfs_dbgmsg_t *zdm;
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while ((zdm = list_remove_head(&zfs_dbgmsgs)) != NULL) {
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int size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
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kmem_free(zdm, size);
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zfs_dbgmsg_size -= size;
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}
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mutex_destroy(&zfs_dbgmsgs_lock);
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ASSERT3U(zfs_dbgmsg_size, ==, 0);
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}
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/*
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* Print these messages by running:
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* echo ::zfs_dbgmsg | mdb -k
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*
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* Monitor these messages by running:
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* dtrace -q -n 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}'
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*/
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void
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zfs_dbgmsg(const char *fmt, ...)
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{
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int size;
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va_list adx;
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zfs_dbgmsg_t *zdm;
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va_start(adx, fmt);
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size = vsnprintf(NULL, 0, fmt, adx);
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va_end(adx);
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/*
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* There is one byte of string in sizeof (zfs_dbgmsg_t), used
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* for the terminating null.
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*/
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zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP);
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zdm->zdm_timestamp = gethrestime_sec();
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va_start(adx, fmt);
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(void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx);
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va_end(adx);
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DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg);
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mutex_enter(&zfs_dbgmsgs_lock);
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list_insert_tail(&zfs_dbgmsgs, zdm);
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zfs_dbgmsg_size += sizeof (zfs_dbgmsg_t) + size;
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while (zfs_dbgmsg_size > zfs_dbgmsg_maxsize) {
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zdm = list_remove_head(&zfs_dbgmsgs);
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size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
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kmem_free(zdm, size);
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zfs_dbgmsg_size -= size;
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}
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mutex_exit(&zfs_dbgmsgs_lock);
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}
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