[Intel-gfx] [PATCH v2 2/2] drm/i915/trace: add hw_id to gem requests trace points

[Chris Wilson]

Quoting Lionel Landwerlin (2017-12-18 15:19:59)
> When monitoring the GPU with i915 perf, reports are tagged with a hw
> id. Gem context creation tracepoints already have a hw_id field,
> unfortunately you only get this correlation between a process id and a
> hw context id once when the context is created. It doesn't help if you
> started monitoring after the process was initialized or if the drm fd
> was transfered from one process to another.
> 
> This change adds the hw_id field to gem requests, so that correlation
> can also be done on submission.
> 
> v2: Place hw_id at the end of the tracepoint to not disrupt too much
>     existing tools (Chris)
> 
> v3: Reorder hw_id field again (Chris)
> 
> v4: Add missing hw_id to i915_gem_request_wait_begin tracepoint (Chris)
> 
> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris