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trace: [tcg] Do not generate TCG code to trace dynamically-disabled events

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If an event is dynamically disabled, the TCG code that calls the
execution-time tracer is not generated.

Removes the overheads of execution-time tracers for dynamically disabled
events. As a bonus, also avoids checking the event state when the
execution-time tracer is called from TCG-generated code (since otherwise
TCG would simply not call it).

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-id: 149915799921.6295.13067154430923434035.stgit@frigg.lan
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Lluís Vilanova 2017-07-04 10:46:39 +02:00 • committed by Stefan Hajnoczi
parent 61a67f71dd
commit 864a2178d4
4 changed files with 41 additions and 14 deletions
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5
scripts/tracetool/format/tcg_helper_c.py
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@ -6,7 +6,7 @@ Generate trace/generated-helpers.c.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@ -71,10 +71,11 @@ def generate(events, backend, group):
out('void %(name_tcg)s(%(args_api)s)',
'{',
# NOTE: the check was already performed at TCG-generation time
' %(name)s(%(args_call)s);',
'}',
name_tcg="helper_%s_proxy" % e.api(),
name=e.api(),
name=e.api(e.QEMU_TRACE_NOCHECK),
args_api=e_args_api,
args_call=", ".join(e_args_call.casted()),
)