linux-kernel - Re: [RFC][PATCH 00/10] tracing: Use TRACE_DEFINE

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Message-ID: <20150331213005.GA8465@dastard>
Date:	Wed, 1 Apr 2015 08:30:05 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [RFC][PATCH 00/10] tracing: Use TRACE_DEFINE_ENUM() to show enum
 values

On Fri, Mar 27, 2015 at 05:37:04PM -0400, Steven Rostedt wrote:
> 
> As there are many tracepoints that use __print_symbolic() to translate
> numbers into ASCII strings, and several of these translate enums as
> well, it causes a problem for user space tools that read the tracepoint
> format files and have to translate the binary data to their associated
> strings.
.....
> Steven Rostedt (Red Hat) (10):
>       tracing: Add TRACE_DEFINE_ENUM() macro to map enums to their values
>       tracing: Allow for modules to export their trace enums as well
>       x86/tlb/trace: Export enums in used by tlb_flush tracepoint
>       net/9p/tracing: Export enums in tracepoints to userspace
>       f2fs: Export the enums in the tracepoints to userspace
>       irq/tracing: Export enums in tracepoints to user space
>       mm: tracing: Export enums in tracepoints to user space
>       SUNRPC: Export enums in tracepoints to user space
>       v4l: Export enums used by tracepoints to user space
>       writeback: Export enums used by tracepoint to user space

So are you expecting subsystem maintainers to modify their tracing
code to do this, or is this just the first round of changes you are
making? e.g:

$ grep print_symbolic fs/xfs/xfs_trace.h
                  __print_symbolic(__entry->trans_type, XFS_TRANS_TYPES),
                  __print_symbolic(__entry->type, XFS_LI_TYPE_DESC),
                  __print_symbolic(__entry->type, XFS_LI_TYPE_DESC),
                  __print_symbolic(__entry->type, XFS_IO_TYPES),
                  __print_symbolic(__entry->type, XFS_ALLOC_TYPES),
                  __print_symbolic(__entry->otype, XFS_ALLOC_TYPES),
                  __print_symbolic(__entry->which, XFS_SWAPEXT_INODES),
                  __print_symbolic(__entry->format, XFS_INODE_FORMAT_STR),
                  __print_symbolic(__entry->type, XFS_LI_TYPE_DESC),
$

And a quick git grep indicates there are a lot that you haven't
converted in this patchset...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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