[Intel-gfx] [RFC i-g-t 2/2] tools/intel_engine_stats: Just a demo

[Chris Wilson]

Quoting Tvrtko Ursulin (2017-08-02 13:33:12)
> diff --git a/tools/intel_engine_stats.c b/tools/intel_engine_stats.c
> new file mode 100644
> index 000000000000..24dbb1eb6a57
> --- /dev/null
> +++ b/tools/intel_engine_stats.c
> @@ -0,0 +1,40 @@
> +#include <stdio.h>
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <fcntl.h>
> +#include <unistd.h>
> +
> +#include "drmtest.h"
> +#include "igt_debugfs.h"
> +
> +int main(void)
> +{
> +       int drm_fd, fd;
> +
> +       drm_fd = drm_open_driver(DRIVER_INTEL);
> +
> +       fd = igt_debugfs_open(drm_fd, "i915_engine_stats", O_RDONLY);
> +       igt_assert(fd >= 0);

I'm just going to advise caution over using debugfs from tools/. If it
is useful enough to wrap up, presumably we want to support it
indefinitely.  This is just 
	watch cat /sys/kernel/debug/dri/0/i915_engine_stats
but a small demo to extract just this from perf would be useful.
-Chris