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e5d1c27e30
This change modifies some of the infrastructure for enabling the use of the DTRACE_PROBE* macros, such that we can use tehm in the "spl" module. Currently, when the DTRACE_PROBE* macros are used, they get expanded to create new functions, and these dynamically generated functions become part of the "zfs" module. Since the "spl" module does not depend on the "zfs" module, the use of DTRACE_PROBE* in the "spl" module would result in undefined symbols being used in the "spl" module. Specifically, DTRACE_PROBE* would turn into a function call, and the function being called would be a symbol only contained in the "zfs" module; which results in a linker and/or runtime error. Thus, this change adds the necessary logic to the "spl" module, to mirror the tracing functionality available to the "zfs" module. After this change, we'll have a "trace_zfs.h" header file which defines the probes available only to the "zfs" module, and a "trace_spl.h" header file which defines the probes available only to the "spl" module. Reviewed by: Brad Lewis <brad.lewis@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Prakash Surya <prakash.surya@delphix.com> Closes #9525
104 lines
3.1 KiB
C
104 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
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* Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2017, Intel Corporation.
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*/
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#include <sys/sysmacros.h>
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#include <sys/zio.h>
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#include <sys/zio_impl.h>
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#include <sys/time.h>
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#include <sys/trace_zfs.h>
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void
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zio_delay_interrupt(zio_t *zio)
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{
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/*
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* The timeout_generic() function isn't defined in userspace, so
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* rather than trying to implement the function, the zio delay
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* functionality has been disabled for userspace builds.
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*/
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#ifdef _KERNEL
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/*
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* If io_target_timestamp is zero, then no delay has been registered
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* for this IO, thus jump to the end of this function and "skip" the
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* delay; issuing it directly to the zio layer.
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*/
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if (zio->io_target_timestamp != 0) {
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hrtime_t now = gethrtime();
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if (now >= zio->io_target_timestamp) {
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/*
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* This IO has already taken longer than the target
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* delay to complete, so we don't want to delay it
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* any longer; we "miss" the delay and issue it
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* directly to the zio layer. This is likely due to
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* the target latency being set to a value less than
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* the underlying hardware can satisfy (e.g. delay
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* set to 1ms, but the disks take 10ms to complete an
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* IO request).
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*/
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DTRACE_PROBE2(zio__delay__miss, zio_t *, zio,
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hrtime_t, now);
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zio_interrupt(zio);
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} else {
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taskqid_t tid;
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hrtime_t diff = zio->io_target_timestamp - now;
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clock_t expire_at_tick = ddi_get_lbolt() +
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NSEC_TO_TICK(diff);
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DTRACE_PROBE3(zio__delay__hit, zio_t *, zio,
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hrtime_t, now, hrtime_t, diff);
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if (NSEC_TO_TICK(diff) == 0) {
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/* Our delay is less than a jiffy - just spin */
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zfs_sleep_until(zio->io_target_timestamp);
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zio_interrupt(zio);
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} else {
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/*
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* Use taskq_dispatch_delay() in the place of
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* OpenZFS's timeout_generic().
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*/
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tid = taskq_dispatch_delay(system_taskq,
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(task_func_t *)zio_interrupt,
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zio, TQ_NOSLEEP, expire_at_tick);
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if (tid == TASKQID_INVALID) {
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/*
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* Couldn't allocate a task. Just
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* finish the zio without a delay.
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*/
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zio_interrupt(zio);
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}
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}
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}
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return;
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}
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#endif
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DTRACE_PROBE1(zio__delay__skip, zio_t *, zio);
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zio_interrupt(zio);
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}
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