linux-kernel - Re: [PATCH RFC 10/10] dpaa

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Date:	Fri, 03 Apr 2015 09:47:01 -0700
From:	Joe Perches <joe@...ches.com>
To:	madalin.bucur@...escale.com
Cc:	netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	Ruxandra Ioana Radulescu <ruxandra.radulescu@...escale.com>
Subject: Re: [PATCH RFC 10/10] dpaa_eth: add trace points

On Wed, 2015-04-01 at 19:19 +0300, Madalin Bucur wrote:
> Add trace points on the hot processing path.

more trivia:

> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h
[]
> +#define fd_format_name(format)	{ qm_fd_##format, #format }
> +#define fd_format_list	\
> +	fd_format_name(contig),	\
> +	fd_format_name(sg)

Are these used anywhere?

> +#define TR_FMT "[%s] fqid=%d, fd: addr=0x%llx, format=%s, off=%u, len=%u," \
> +	" status=0x%08x"

It's nicer to coalesce string fragments.

Unless this is intended to be used more than once,
perhaps it's better to remove it and use the string
directly instead.

> +	/* This is what gets printed when the trace event is triggered */
> +	TP_printk(TR_FMT,
> +		  __get_str(name), __entry->fqid, __entry->fd_addr,
> +		  __print_symbolic(__entry->fd_format, fd_format_list),
> +		  __entry->fd_offset, __entry->fd_length, __entry->fd_status)


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