Re: [Qemu-devel] [PATCH 06/14] trace: Trace entry point of balloon request handler

[Anthony Liguori <anthony@codemonkey.ws>]

On 08/12/2010 05:36 AM, Stefan Hajnoczi wrote:
> From: Prerna Saxena<prerna@linux.vnet.ibm.com>
>
> Signed-off-by: Prerna Saxena<prerna@linux.vnet.ibm.com>
> Signed-off-by: Stefan Hajnoczi<stefanha@linux.vnet.ibm.com>
> ---
>   balloon.c    |    2 ++
>   trace-events |    4 ++++
>   2 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/balloon.c b/balloon.c
> index 8e0b7f1..0021fef 100644
> --- a/balloon.c
> +++ b/balloon.c
> @@ -29,6 +29,7 @@
>   #include "cpu-common.h"
>   #include "kvm.h"
>   #include "balloon.h"
> +#include "trace.h"
>
>
>   static QEMUBalloonEvent *qemu_balloon_event;
> @@ -43,6 +44,7 @@ void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
>   int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque)
>   {
>       if (qemu_balloon_event) {
> +        trace_balloon_event(qemu_balloon_event_opaque, target);
>           qemu_balloon_event(qemu_balloon_event_opaque, target, cb, opaque);
>           return 1;
>       } else {
> diff --git a/trace-events b/trace-events
> index c1f3e28..eae62da 100644
> --- a/trace-events
> +++ b/trace-events
> @@ -58,3 +58,7 @@ paio_submit(void *acb, void *opaque, unsigned long sector_num, unsigned long nb_
>   # ioport.c
>   cpu_in(unsigned int addr, unsigned int val) "addr %#x value %u"
>   cpu_out(unsigned int addr, unsigned int val) "addr %#x value %u"
> +
> +# balloon.c
> +# Since requests are raised via monitor, not many tracepoints are needed.
> +balloon_event(void *opaque, unsigned long addr) "opaque %p addr %lu"
>    

ram_addr_t is not necessarily an unsigned long.  It's actually a 
uint64_t.   Integer promotion should handle this in most cases but 
having the definition in two different places worries me a bit.

Regards,

Anthony Liguori