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79c76d5b65
By marking DMU transaction processing contexts with PF_FSTRANS we can revert the KM_PUSHPAGE -> KM_SLEEP changes. This brings us back in line with upstream. In some cases this means simply swapping the flags back. For others fnvlist_alloc() was replaced by nvlist_alloc(..., KM_PUSHPAGE) and must be reverted back to fnvlist_alloc() which assumes KM_SLEEP. The one place KM_PUSHPAGE is kept is when allocating ARC buffers which allows us to dip in to reserved memory. This is again the same as upstream. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
123 lines
3.1 KiB
C
123 lines
3.1 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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* Copyright (c) 2012, 2014 by Delphix. 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 = 4<<20; /* 4MB */
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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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ASSERT0(zfs_dbgmsg_size);
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}
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/*
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* To get this data enable the zfs__dbgmsg tracepoint as shown:
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*
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* # Enable zfs__dbgmsg tracepoint, clear the tracepoint ring buffer
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* $ echo 1 > /sys/kernel/debug/tracing/events/zfs/enable
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* $ echo 0 > /sys/kernel/debug/tracing/trace
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*
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* # Dump the ring buffer.
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* $ cat /sys/kernel/debug/tracing/trace
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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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char *nl;
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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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/*
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* Get rid of trailing newline.
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*/
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nl = strrchr(zdm->zdm_msg, '\n');
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if (nl != NULL)
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*nl = '\0';
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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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void
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zfs_dbgmsg_print(const char *tag)
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{
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#if !defined(_KERNEL)
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zfs_dbgmsg_t *zdm;
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(void) printf("ZFS_DBGMSG(%s):\n", tag);
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mutex_enter(&zfs_dbgmsgs_lock);
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for (zdm = list_head(&zfs_dbgmsgs); zdm;
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zdm = list_next(&zfs_dbgmsgs, zdm))
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(void) printf("%s\n", zdm->zdm_msg);
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mutex_exit(&zfs_dbgmsgs_lock);
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#endif /* !_KERNEL */
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}
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