[Qemu-devel] Re: [PATCH 2/3] Monitor command 'info trace'

[Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>]

On Wed, Jun 16, 2010 at 06:12:06PM +0530, Prerna Saxena wrote:
> diff --git a/simpletrace.c b/simpletrace.c
> index 2fec4d3..239ae3f 100644
> --- a/simpletrace.c
> +++ b/simpletrace.c
> @@ -62,3 +62,16 @@ void trace4(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long
>  void trace5(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4, unsigned long x5) {
>      trace(event, x1, x2, x3, x4, x5);
>  }
> +
> +void do_info_trace(Monitor *mon)
> +{
> +    unsigned int i, max_idx;
> +
> +    max_idx = trace_idx ? trace_idx : TRACE_BUF_LEN;

trace_idx is always in the range [0, TRACE_BUF_LEN).  There is no need
to perform this test.

> +
> +    for (i=0; i<max_idx ;i++) {

Whitespace "i=0; i<max_idx ;i++".  "i = 0; i < max_idx; i++" is pretty
common across QEMU.

> +        monitor_printf(mon, "Event %ld : %ld %ld %ld %ld %ld\n",
> +                          trace_buf[i].event, trace_buf[i].x1, trace_buf[i].x2,
> +                            trace_buf[i].x3, trace_buf[i].x4, trace_buf[i].x5);

Getting only numeric output is the limitation of a binary trace.  It
would probably be possible to pretty-print without much additional code
by using the format strings from the trace-events file.

I think the numeric dump is good for now though.  Hex is more compact
than decimal and would make pointers easier to spot.  Want to change
this?

> +    }
> +}
> diff --git a/tracetool b/tracetool
> index 9ea9c08..2c73bab 100755
> --- a/tracetool
> +++ b/tracetool
> @@ -130,6 +130,7 @@ void trace2(TraceEvent event, unsigned long x1, unsigned long x2);
>  void trace3(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3);
>  void trace4(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4);
>  void trace5(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4, unsigned long x5);
> +void do_info_trace(Monitor *mon);
>  EOF
> 
>      simple_event_num=0
> @@ -289,6 +290,7 @@ tracetoh()
>  #define TRACE_H
> 
>  #include "qemu-common.h"
> +#include "monitor.h"

qemu-common.h forward-declares Monitor, I don't think you need
monitor.h.

Stefan