On Wed, 2012-08-22 at 17:43 +0900, Yoshihiro YUNOMAE wrote:
> Add read path and control path to use trace-agent of virtio-trace.
> When we use trace-agent, trace-cmd will be used as follows:
> # AGENT_READ_DIR=/tmp/virtio-trace/tracing \
> AGENT_CTL=/tmp/virtio-trace/agent-ctl-path.in \
> TRACING_DIR=/tmp/virtio-trace/debugfs/tracing \\
Ha! You used "TRACING_DIR" but patch one introduces TRACE_DIR. Lets
change this to DEBUG_TRACING_DIR instead anyway.
Also, I don't like the generic environment variables. Perhaps
VIRTIO_TRACE_DIR, or AGENT_TRACE_DIR and AGENT_TRACE_CTL. Lets try to
keep the environment namespace sparse.
> trace-cmd record -e "sched:*"
> Here, AGENT_READ_DIR is the path for a reading directory of virtio-trace,
> AGENT_CTL is a control path of trace-agent, and TRACING_DIR is a debugfs path
> of a guest.
>
> Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@xxxxxxxxxxx>
> ---
>
> trace-cmd.h | 1 +
> trace-recorder.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
> trace-util.c | 18 +++++++++++++++++
> 3 files changed, 75 insertions(+), 1 deletions(-)
>
> diff --git a/trace-cmd.h b/trace-cmd.h
> index f904dc5..75506ed 100644
> --- a/trace-cmd.h
> +++ b/trace-cmd.h
> @@ -72,6 +72,7 @@ static inline int tracecmd_host_bigendian(void)
> }
>
> char *tracecmd_find_tracing_dir(void);
> +char *guest_agent_tracing_read_dir(void);
>
> /* --- Opening and Reading the trace.dat file --- */
>
> diff --git a/trace-recorder.c b/trace-recorder.c
> index 215affc..3b750e9 100644
> --- a/trace-recorder.c
> +++ b/trace-recorder.c
> @@ -33,6 +33,7 @@
> #include <unistd.h>
> #include <ctype.h>
> #include <errno.h>
> +#include <stdbool.h>
>
> #include "trace-cmd.h"
>
> @@ -43,6 +44,8 @@ struct tracecmd_recorder {
> int page_size;
> int cpu;
> int stop;
> + int ctl_fd;
> + bool agent_existing;
Thanks for the reminder. I need to convert a lot to use 'bool' instead.
> };
>
> void tracecmd_free_recorder(struct tracecmd_recorder *recorder)
> @@ -59,11 +62,29 @@ void tracecmd_free_recorder(struct tracecmd_recorder *recorder)
> free(recorder);
> }
>
> +static char *use_trace_agent_dir(char *ctl_path,
> + struct tracecmd_recorder *recorder)
> +{
> + ctl_path = strdup(ctl_path);
> + if (!ctl_path)
> + die("malloc");
> + warning("Use environmental control path: %s\n", ctl_path);
s/Use/Using/
-- Steve
> +
> + recorder->ctl_fd = open(ctl_path, O_WRONLY);
> + if (recorder->ctl_fd < 0)
> + return NULL;
> +
> + recorder->agent_existing = true;
> +
> + return guest_agent_tracing_read_dir();
> +}
> +
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