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Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' into staging

Pull request

# gpg: Signature made Thu 30 Jan 2020 21:38:06 GMT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/tracing-pull-request:
  qemu_set_log_filename: filename argument may be NULL
  hw/display/qxl.c: Use trace_event_get_state_backends()
  memory.c: Use trace_event_get_state_backends()
  docs/devel/tracing.txt: Recommend only trace_event_get_state_backends()
  Makefile: Keep trace-events-subdirs ordered

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2020-01-31 17:36:59 +00:00
commit 28db64fce5
7 changed files with 30 additions and 33 deletions
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12
docs/devel/tracing.txt
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@ -342,8 +342,10 @@ edit the "trace-events-all" file).
In addition, there might be cases where relatively complex computations must be
performed to generate values that are only used as arguments for a trace
function. In these cases you can use the macro 'TRACE_${EVENT_NAME}_ENABLED' to
guard such computations and avoid its compilation when the event is disabled:
function. In these cases you can use 'trace_event_get_state_backends()' to
guard such computations, so they are skipped if the event has been either
compile-time disabled or run-time disabled. If the event is compile-time
disabled, this check will have no performance impact.
#include "trace.h" /* needed for trace event prototype */
@ -356,7 +358,7 @@ guard such computations and avoid its compilation when the event is disabled:
align = getpagesize();
}
ptr = qemu_memalign(align, size);
if (TRACE_QEMU_VMALLOC_ENABLED) { /* preprocessor macro */
if (trace_event_get_state_backends(TRACE_QEMU_VMALLOC)) {
void *complex;
/* some complex computations to produce the 'complex' value */
trace_qemu_vmalloc(size, ptr, complex);
@ -364,10 +366,6 @@ guard such computations and avoid its compilation when the event is disabled:
return ptr;
}
You can check both if the event has been disabled and is dynamically enabled at
the same time using the 'trace_event_get_state_backends' routine (see header
"trace/control.h" for more information).
=== "tcg" ===
Guest code generated by TCG can be traced by defining an event with the "tcg"