On Mon, Sep 23, 2013 at 05:33:26PM -0300, Rodrigo Vivi wrote:
> From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
>
> So that we can find the callers who introduce a ring stall. A single
> ring stall is not too unwelcome, the right issue becomes when they start
> to interlock and prevent any concurrent work. That, however, is a little
> tricker to detect with a mere tracepoint!
>
> v2: Rebrand it as a ring event, rather than an object event.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Just wondering if we would want to see the seqno(s) in the trace as well?
But anyway, the patch looks fine.
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem.c | 2 ++
> drivers/gpu/drm/i915/i915_trace.h | 19 +++++++++++++++++++
> 2 files changed, 21 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index d68cc5c..4a16491 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -2614,6 +2614,8 @@ i915_gem_object_sync(struct drm_i915_gem_object *obj,
> if (ret)
> return ret;
>
> + trace_i915_gem_ring_sync_to(from, to);
> +
> ret = to->sync_to(to, from, seqno);
> if (!ret)
> /* We use last_read_seqno because sync_to()
> diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
> index 5c8e36a..48e8f07 100644
> --- a/drivers/gpu/drm/i915/i915_trace.h
> +++ b/drivers/gpu/drm/i915/i915_trace.h
> @@ -233,6 +233,25 @@ TRACE_EVENT(i915_gem_evict_everything,
> TP_printk("dev=%d", __entry->dev)
> );
>
> +TRACE_EVENT(i915_gem_ring_sync_to,
> + TP_PROTO(struct intel_ring_buffer *from, struct intel_ring_buffer *to),
> + TP_ARGS(from, to),
> +
> + TP_STRUCT__entry(
> + __field(u32, dev)
> + __field(u32, sync_from)
> + __field(u32, sync_to)
> + ),
> +
> + TP_fast_assign(
> + __entry->dev = from->dev->primary->index;
> + __entry->sync_from = from->id;
> + __entry->sync_to = to->id;
> + ),
> +
> + TP_printk("dev=%u, sync-from=%u, sync-to=%u", __entry->dev, __entry->sync_from, __entry->sync_to)
> +);
> +
> TRACE_EVENT(i915_gem_ring_dispatch,
> TP_PROTO(struct intel_ring_buffer *ring, u32 flags),
> TP_ARGS(ring, flags),
> --
> 1.8.1.4
>
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--
Ville Syrjälä
Intel OTC
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