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provider. The NFS client exposes 'start' and 'done' probes for NFSv2 and NFSv3 RPCs when using the new RPC implementation, passing in the vnode, mbuf chain, credential, and NFSv2 or NFSv3 procedure number. For 'done' probes, the error number is also available. Probes are named in the following way: ... nfsclient:nfs2:write:start nfsclient:nfs2:write:done ... nfsclient:nfs3:access:start nfsclient:nfs3:access:done ... Access to the unmarshalled arguments is not easily available at this point in the stack, but the passed probe arguments are sufficient to to a lot of interesting things in practice. Technically, these probes may cover multiple RPC retransmits, and even transactions if the transaction ID change as a result of authentication failure or a jukebox error from the server, but usefully capture the intent of a single NFS request, such as access, getattr, write, etc. Typical use might involve profiling RPC latency by system call, number of RPCs, how often a getattr leads to a call to access, when failed access control checks occur, etc. More detailed RPC information might best be provided by adding a krpc provider. It would also be useful to add NFS client probes for events such as the access cache or attribute cache satisfying requests without an RPC. Sponsored by: Google, Inc. MFC after: 1 month
75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/*
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* Copyright (C) 2008 John Birrell <jb@freebsd.org>
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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 AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/errno.h>
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static int
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dtraceall_modevent(module_t mod __unused, int type, void *data __unused)
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{
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int error = 0;
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switch (type) {
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case MOD_LOAD:
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break;
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case MOD_UNLOAD:
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break;
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case MOD_SHUTDOWN:
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return (error);
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}
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DEV_MODULE(dtraceall, dtraceall_modevent, NULL);
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MODULE_VERSION(dtraceall, 1);
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/* All the DTrace modules should be dependencies here: */
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MODULE_DEPEND(dtraceall, cyclic, 1, 1, 1);
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MODULE_DEPEND(dtraceall, opensolaris, 1, 1, 1);
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MODULE_DEPEND(dtraceall, dtrace, 1, 1, 1);
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MODULE_DEPEND(dtraceall, dtmalloc, 1, 1, 1);
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MODULE_DEPEND(dtraceall, dtnfsclient, 1, 1, 1);
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#if defined(__amd64__) || defined(__i386__)
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MODULE_DEPEND(dtraceall, fbt, 1, 1, 1);
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#endif
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MODULE_DEPEND(dtraceall, sdt, 1, 1, 1);
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MODULE_DEPEND(dtraceall, systrace, 1, 1, 1);
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MODULE_DEPEND(dtraceall, profile, 1, 1, 1);
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