linux-kernel - Re: [PATCH 2/3] tracing: Make trace_marker use the correct per-instance buffer

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Date:	Mon, 01 Jul 2013 20:25:04 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexander Z Lam <azl@...gle.com>
Cc:	linux-kernel@...r.kernel.org, David Sharp <dhsharp@...gle.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	Alexander Z Lam <lambchop468@...il.com>
Subject: Re: [PATCH 2/3] tracing: Make trace_marker use the correct
 per-instance buffer

On Mon, 2013-07-01 at 15:31 -0700, Alexander Z Lam wrote:
> The trace_marker file was present for each new instance created, but it
> added the trace mark to the global trace buffer instead of to
> the instance's buffer.

Thanks, I'll get this into this merge window. And maybe even mark it for
stable.

-- Steve

> 
> Cc: David Sharp <dhsharp@...gle.com>
> Cc: Vaibhav Nagarnaik <vnagarnaik@...gle.com>
> Cc: Alexander Z Lam <lambchop468@...il.com>
> Signed-off-by: Alexander Z Lam <azl@...gle.com>
> ---
>  kernel/trace/trace.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index e0b0d2a..2f7307e 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -4351,6 +4351,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
>  					size_t cnt, loff_t *fpos)
>  {
>  	unsigned long addr = (unsigned long)ubuf;
> +	struct trace_array *tr = filp->private_data;
>  	struct ring_buffer_event *event;
>  	struct ring_buffer *buffer;
>  	struct print_entry *entry;
> @@ -4410,7 +4411,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
>  
>  	local_save_flags(irq_flags);
>  	size = sizeof(*entry) + cnt + 2; /* possible \n added */
> -	buffer = global_trace.trace_buffer.buffer;
> +	buffer = tr->trace_buffer.buffer;
>  	event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
>  					  irq_flags, preempt_count());
>  	if (!event) {


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