linux-kernel - Re: [RFC][PATCH 03/12 v3] tracing: Create seq_buf layer in trace

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Date:	Wed, 5 Nov 2014 15:26:20 +0100
From:	Petr Mladek <pmladek@...e.cz>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH 03/12 v3] tracing: Create seq_buf layer in trace_seq

On Tue 2014-11-04 10:52:40, Steven Rostedt wrote:
> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> Create a seq_buf layer that trace_seq sits on. The seq_buf will not
> be limited to page size. This will allow other usages of seq_buf
> instead of a hard set PAGE_SIZE one that trace_seq has.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  include/linux/seq_buf.h              |  72 ++++++++
>  include/linux/trace_seq.h            |  10 +-
>  kernel/trace/Makefile                |   1 +
>  kernel/trace/seq_buf.c               | 341 +++++++++++++++++++++++++++++++++++
>  kernel/trace/trace.c                 |  39 ++--
>  kernel/trace/trace_events.c          |   6 +-
>  kernel/trace/trace_functions_graph.c |   6 +-
>  kernel/trace/trace_seq.c             | 184 +++++++++----------
>  8 files changed, 534 insertions(+), 125 deletions(-)
>  create mode 100644 include/linux/seq_buf.h
>  create mode 100644 kernel/trace/seq_buf.c
> 
> diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
> new file mode 100644
> index 000000000000..97872154d51c
> --- /dev/null
> +++ b/include/linux/seq_buf.h
> @@ -0,0 +1,72 @@
> +#ifndef _LINUX_SEQ_BUF_H
> +#define _LINUX_SEQ_BUF_H
> +
> +#include <linux/fs.h>
> +
> +#include <asm/page.h>

One more small thing. We do not need this include because
seq_buf does not use the PAGE_SIZE.

Best Regards,
Petr
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