tracing: Use double-dash spelling for trace option
The '-trace' and '--trace' spellings are only both supported in qemu binary, while for qemu-nbd or qemu-img only '--trace' spelling is supported. So for the consistency of trace option invocation, we should use double-dash spelling in our documentation. This's also mentioned in https://wiki.qemu.org/BiteSizedTasks#Consistent_option_usage_in_documentation . Signed-off-by: Yaowei Bai <baiyaowei@cmss.chinamobile.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 1530674247-31200-1-git-send-email-baiyaowei@cmss.chinamobile.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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@ -18,7 +18,7 @@ for debugging, profiling, and observing execution.
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3. Run the virtual machine to produce a trace file:
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3. Run the virtual machine to produce a trace file:
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qemu -trace events=/tmp/events ... # your normal QEMU invocation
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qemu --trace events=/tmp/events ... # your normal QEMU invocation
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4. Pretty-print the binary trace file:
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4. Pretty-print the binary trace file:
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@ -157,11 +157,11 @@ The state of events can also be queried and modified through monitor commands:
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* trace-event NAME on|off
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* trace-event NAME on|off
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Enable/disable a given trace event or a group of events (using wildcards).
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Enable/disable a given trace event or a group of events (using wildcards).
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The "-trace events=<file>" command line argument can be used to enable the
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The "--trace events=<file>" command line argument can be used to enable the
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events listed in <file> from the very beginning of the program. This file must
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events listed in <file> from the very beginning of the program. This file must
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contain one event name per line.
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contain one event name per line.
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If a line in the "-trace events=<file>" file begins with a '-', the trace event
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If a line in the "--trace events=<file>" file begins with a '-', the trace event
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will be disabled instead of enabled. This is useful when a wildcard was used
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will be disabled instead of enabled. This is useful when a wildcard was used
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to enable an entire family of events but one noisy event needs to be disabled.
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to enable an entire family of events but one noisy event needs to be disabled.
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@ -253,7 +253,7 @@ void trace_init_file(const char *file)
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#ifdef CONFIG_TRACE_SIMPLE
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#ifdef CONFIG_TRACE_SIMPLE
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st_set_trace_file(file);
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st_set_trace_file(file);
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#elif defined CONFIG_TRACE_LOG
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#elif defined CONFIG_TRACE_LOG
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/* If both the simple and the log backends are enabled, "-trace file"
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/* If both the simple and the log backends are enabled, "--trace file"
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* only applies to the simple backend; use "-D" for the log backend.
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* only applies to the simple backend; use "-D" for the log backend.
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*/
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*/
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if (file) {
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if (file) {
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@ -261,7 +261,7 @@ void trace_init_file(const char *file)
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}
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}
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#else
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#else
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if (file) {
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if (file) {
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fprintf(stderr, "error: -trace file=...: "
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fprintf(stderr, "error: --trace file=...: "
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"option not supported by the selected tracing backends\n");
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"option not supported by the selected tracing backends\n");
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exit(1);
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exit(1);
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}
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}
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@ -193,7 +193,7 @@ void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
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/**
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/**
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* trace_init_backends:
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* trace_init_backends:
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* @file: Name of trace output file; may be NULL.
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* @file: Name of trace output file; may be NULL.
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* Corresponds to commandline option "-trace file=...".
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* Corresponds to commandline option "--trace file=...".
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*
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*
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* Initialize the tracing backend.
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* Initialize the tracing backend.
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*
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*
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@ -204,7 +204,7 @@ bool trace_init_backends(void);
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/**
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/**
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* trace_init_file:
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* trace_init_file:
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* @file: Name of trace output file; may be NULL.
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* @file: Name of trace output file; may be NULL.
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* Corresponds to commandline option "-trace file=...".
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* Corresponds to commandline option "--trace file=...".
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*
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*
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* Record the name of the output file for the tracing backend.
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* Record the name of the output file for the tracing backend.
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* Exits if no selected backend does not support specifying the
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* Exits if no selected backend does not support specifying the
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