Re: [PATCH 2/3] dma-mapping: Use trace_dma_alloc for dma_alloc* instead of using trace_dma_map

[Christoph Hellwig]

On Thu, Oct 17, 2024 at 02:13:53PM -0400, Sean Anderson wrote:
> +DECLARE_EVENT_CLASS(_dma_alloc,
>  	TP_PROTO(struct device *dev, void *virt_addr, dma_addr_t dma_addr,
>  		 size_t size, enum dma_data_direction dir, gfp_t flags,
>  		 unsigned long attrs),
> @@ -149,7 +149,60 @@ TRACE_EVENT(dma_alloc,
>  		decode_dma_attrs(__entry->attrs))
>  );
>  
> -TRACE_EVENT(dma_free,
> +DEFINE_EVENT(_dma_alloc, dma_alloc,
> +	TP_PROTO(struct device *dev, void *virt_addr, dma_addr_t dma_addr,
> +		 size_t size, enum dma_data_direction dir, gfp_t flags,
> +		 unsigned long attrs),
> +	TP_ARGS(dev, virt_addr, dma_addr, size, dir, flags, attrs));
> +
> +DEFINE_EVENT(_dma_alloc, dma_alloc_pages,

The scheme we used in XFS (fs/xfs/xfs_trace.h) for the event classes is
to give the class a _class postdix, and use macros to avoid the repeated
DEFINE_EVENT boilerplate.  Any chance you could rewrite this to use
a similar scheme?