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d654bc4190
Every dtrace/systemd probe also include a libvirt log message. These are logged at level DEBUG currently, which means if you want to see all probes they are drowned by the rest of the DEBUG messages. Since we don't really use the INFO log level for much, it seems reasonable to suggest we log all probes at level INFO.
101 lines
4.4 KiB
C
101 lines
4.4 KiB
C
/*
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* virprobe.h: dynamic operation tracing
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*
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* Copyright (C) 2006-2014 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __VIR_PROBE_H__
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# define __VIR_PROBE_H__
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# include "internal.h"
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# include "virlog.h"
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# if WITH_DTRACE_PROBES
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# ifndef LIBVIRT_PROBES_H
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# define LIBVIRT_PROBES_H
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# include "libvirt_probes.h"
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# endif /* LIBVIRT_PROBES_H */
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/* Systemtap 1.2 headers have a bug where they cannot handle a
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* variable declared with array type. Work around this by casting all
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* arguments. This is some gross use of the preprocessor because
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* PROBE is a var-arg macro, but it is better than the alternative of
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* making all callers to PROBE have to be aware of the issues. And
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* hopefully, if we ever add a call to PROBE with other than 9
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* end arguments, you can figure out the pattern to extend this hack.
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*/
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# define VIR_COUNT_ARGS(...) VIR_ARG11(__VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
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# define VIR_ARG11(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, ...) _11
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# define VIR_ADD_CAST_EXPAND(a, b, ...) VIR_ADD_CAST_PASTE(a, b, __VA_ARGS__)
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# define VIR_ADD_CAST_PASTE(a, b, ...) a##b(__VA_ARGS__)
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/* The double cast is necessary to silence gcc warnings; any pointer
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* can safely go to intptr_t and back to void *, which collapses
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* arrays into pointers; while any integer can be widened to intptr_t
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* then cast to void *. */
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# define VIR_ADD_CAST(a) ((void *)(intptr_t)(a))
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# define VIR_ADD_CAST1(a) \
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VIR_ADD_CAST(a)
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# define VIR_ADD_CAST2(a, b) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b)
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# define VIR_ADD_CAST3(a, b, c) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c)
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# define VIR_ADD_CAST4(a, b, c, d) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d)
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# define VIR_ADD_CAST5(a, b, c, d, e) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e)
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# define VIR_ADD_CAST6(a, b, c, d, e, f) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f)
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# define VIR_ADD_CAST7(a, b, c, d, e, f, g) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
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VIR_ADD_CAST(g)
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# define VIR_ADD_CAST8(a, b, c, d, e, f, g, h) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
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VIR_ADD_CAST(g), VIR_ADD_CAST(h)
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# define VIR_ADD_CAST9(a, b, c, d, e, f, g, h, i) \
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VIR_ADD_CAST(a), VIR_ADD_CAST(b), VIR_ADD_CAST(c), \
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VIR_ADD_CAST(d), VIR_ADD_CAST(e), VIR_ADD_CAST(f), \
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VIR_ADD_CAST(g), VIR_ADD_CAST(h), VIR_ADD_CAST(i)
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# define VIR_ADD_CASTS(...) \
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VIR_ADD_CAST_EXPAND(VIR_ADD_CAST, VIR_COUNT_ARGS(__VA_ARGS__), \
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__VA_ARGS__)
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# define PROBE_EXPAND(NAME, ARGS) NAME(ARGS)
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# define PROBE(NAME, FMT, ...) \
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VIR_INFO_INT(&virLogSelf, \
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__FILE__, __LINE__, __func__, \
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#NAME ": " FMT, __VA_ARGS__); \
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if (LIBVIRT_ ## NAME ## _ENABLED()) { \
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PROBE_EXPAND(LIBVIRT_ ## NAME, \
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VIR_ADD_CASTS(__VA_ARGS__)); \
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}
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# else
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# define PROBE(NAME, FMT, ...) \
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VIR_INFO_INT(&virLogSelf, \
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__FILE__, __LINE__, __func__, \
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#NAME ": " FMT, __VA_ARGS__);
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# endif
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#endif /* __VIR_PROBE_H__ */
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