linux-kernel - Re: [RFC PATCH 2/2] trace: splice support for tracing

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Date:	Mon, 9 Feb 2009 10:49:59 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
cc:	mingo@...e.hu, fweisbec@...il.com, penberg@...helsinki.fi,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] trace: splice support for tracing_pipe


On Mon, 9 Feb 2009, Eduard - Gabriel Munteanu wrote:
> +
> +static ssize_t tracing_splice_read_pipe(struct file *filp,
> +					loff_t *ppos,
> +					struct pipe_inode_info *pipe,
> +					size_t len,
> +					unsigned int flags)
> +{
> +	struct page *pages[PIPE_BUFFERS];
> +	struct partial_page partial[PIPE_BUFFERS];
> +	struct trace_iterator *iter = filp->private_data;
> +	struct splice_pipe_desc spd = {
> +		.pages = pages,
> +		.partial = partial,
> +		.nr_pages = 0, /* This gets updated below. */
> +		.flags = flags,
> +		.ops = &tracing_pipe_buf_ops,
> +		.spd_release = tracing_spd_release_pipe,
> +	};

Note, this is getting a little stack heavy. It is still in bounds,
but I get very nervous when I see structure arrays on the stack.
If either the structure or the array grows large, we can be in trouble.

-- Steve

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