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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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21
scripts/tracetool/format/tcg_h.py
View file

@ -6,7 +6,7 @@ Generate .h file for TCG code generation.
"""
__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"
@ -46,7 +46,7 @@ def generate(events, backend, group):
for e in events:
# just keep one of them
if "tcg-trans" not in e.properties:
if "tcg-exec" not in e.properties:
continue
out('static inline void %(name_tcg)s(%(args)s)',
@ -58,12 +58,25 @@ def generate(events, backend, group):
args_trans = e.original.event_trans.args
args_exec = tracetool.vcpu.transform_args(
"tcg_helper_c", e.original.event_exec, "wrapper")
if "vcpu" in e.properties:
trace_cpu = e.args.names()[0]
cond = "trace_event_get_vcpu_state(%(cpu)s,"\
" TRACE_%(id)s)"\
% dict(
cpu=trace_cpu,
id=e.original.event_exec.name.upper())
else:
cond = "true"
out(' %(name_trans)s(%(argnames_trans)s);',
' gen_helper_%(name_exec)s(%(argnames_exec)s);',
' if (%(cond)s) {',
' gen_helper_%(name_exec)s(%(argnames_exec)s);',
' }',
name_trans=e.original.event_trans.api(e.QEMU_TRACE),
name_exec=e.original.event_exec.api(e.QEMU_TRACE),
argnames_trans=", ".join(args_trans.names()),
argnames_exec=", ".join(args_exec.names()))
argnames_exec=", ".join(args_exec.names()),
cond=cond)
out('}')