linux-kernel - Re: [PATCH] mellanox: mlx5: Use logging functions to reduce text ~10k/5%

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Message-ID: <20160622204056.GB20838@obsidianresearch.com>
Date:	Wed, 22 Jun 2016 14:40:56 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Matan Barak <matanb@...lanox.com>,
	Leon Romanovsky <leonro@...lanox.com>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mellanox: mlx5: Use logging functions to reduce text
 ~10k/5%

On Wed, Jun 22, 2016 at 11:23:59AM -0700, Joe Perches wrote:

> The output changes now do not include line #, but do include the
> function offset.

I've been using a technique like this in some code with good results:

struct source_location
{
   const char *file;
   const char *func;
   const char *format;
   uint16_t line;
};
#define _LOCATION(format) ({static const source_location __location__ = {\
             __FILE__,__PRETTY_FUNCTION__,format,__LINE__};\
	     &__location__;})

void _mlx5_core_err(const struct source_location *loc,struct mlx5_core_dev *dev, ...);
#define mlx5_core_err(dev,format,...) _mlx_core_err(_LOCATION(format),dev,__VA_ARGS__)

The call site .text overhead is the about same as what you have, but
this still retains the function and line number information in
.rodata.

Jason