[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-devel] [PATCH] tracetool: Omit useless QEMU_*_ENABLED() check

From: Stefan Hajnoczi
Subject: [Qemu-devel] [PATCH] tracetool: Omit useless QEMU_*_ENABLED() check
Date: Tue, 27 Sep 2011 09:00:22 +0100

SystemTap provides a "semaphore" that can optionally be tested before
executing a trace event.  The purpose of this mechanism is to skip
expensive tracing code when the trace event is disabled.

For example, some applications may have trace events that format or
convert strings for trace events.  This expensive processing should only
be done in the case where the trace event is enabled.

Since QEMU's generated trace events never have such special-purpose
code, there is no reason to add the semaphore check.

Signed-off-by: Stefan Hajnoczi <address@hidden>
 scripts/tracetool |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/scripts/tracetool b/scripts/tracetool
index 4c9951d..ffe3eba 100755
--- a/scripts/tracetool
+++ b/scripts/tracetool
@@ -415,9 +415,7 @@ linetoh_dtrace()
     # Define an empty function for the trace event
     cat <<EOF
 static inline void trace_$name($args) {
-    if (QEMU_${nameupper}_ENABLED()) {
-        QEMU_${nameupper}($argnames);
-    }
+    QEMU_${nameupper}($argnames);

reply via email to

[Prev in Thread] Current Thread [Next in Thread]