linux-kernel - Re: [PATCH 1/6] uprobes/tracing: Introduce uprobe_{trace,perf}

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Date:	Sun, 7 Apr 2013 19:28:25 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Anton Arapov <anton@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] uprobes/tracing: Introduce
 uprobe_{trace,perf}_print() helpers

* Oleg Nesterov <oleg@...hat.com> [2013-04-01 18:08:45]:

> Extract the output code from uprobe_trace_func() and uprobe_perf_func()
> into the new helpers, they will be used by ->ret_handler() too. We also
> add the unused "unsigned long func" argument in advance, to simplify the
> next changes.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

> ---
>  kernel/trace/trace_uprobe.c |   29 ++++++++++++++++++++---------
>  1 files changed, 20 insertions(+), 9 deletions(-)
> 
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 92a4b08..2ea9961 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -496,8 +496,8 @@ static const struct file_operations uprobe_profile_ops = {
>  	.release	= seq_release,
>  };
> 
> -/* uprobe handler */
> -static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
> +static void uprobe_trace_print(struct trace_uprobe *tu,
> +				unsigned long func, struct pt_regs *regs)
>  {
>  	struct uprobe_trace_entry_head *entry;
>  	struct ring_buffer_event *event;
> @@ -510,7 +510,7 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
>  	event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
>  						  size, 0, 0);
>  	if (!event)
> -		return 0;
> +		return;
> 
>  	entry = ring_buffer_event_data(event);
>  	entry->vaddr[0] = instruction_pointer(regs);
> @@ -520,7 +520,12 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
> 
>  	if (!filter_current_check_discard(buffer, call, entry, event))
>  		trace_buffer_unlock_commit(buffer, event, 0, 0);
> +}
> 
> +/* uprobe handler */
> +static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
> +{
> +	uprobe_trace_print(tu, 0, regs);
>  	return 0;
>  }
> 
> @@ -753,8 +758,8 @@ static bool uprobe_perf_filter(struct uprobe_consumer *uc,
>  	return ret;
>  }
> 
> -/* uprobe profile handler */
> -static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
> +static void uprobe_perf_print(struct trace_uprobe *tu,
> +				unsigned long func, struct pt_regs *regs)
>  {
>  	struct ftrace_event_call *call = &tu->call;
>  	struct uprobe_trace_entry_head *entry;
> @@ -763,13 +768,10 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
>  	void *data;
>  	int size, rctx, i;
> 
> -	if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
> -		return UPROBE_HANDLER_REMOVE;
> -
>  	size = SIZEOF_TRACE_ENTRY(1);
>  	size = ALIGN(size + tu->size + sizeof(u32), sizeof(u64)) - sizeof(u32);
>  	if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
> -		return 0;
> +		return;
> 
>  	preempt_disable();
>  	entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
> @@ -786,6 +788,15 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
>  	perf_trace_buf_submit(entry, size, rctx, ip, 1, regs, head, NULL);
>   out:
>  	preempt_enable();
> +}
> +
> +/* uprobe profile handler */
> +static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
> +{
> +	if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
> +		return UPROBE_HANDLER_REMOVE;
> +
> +	uprobe_perf_print(tu, 0, regs);
>  	return 0;
>  }
>  #endif	/* CONFIG_PERF_EVENTS */
> -- 
> 1.5.5.1
> 

-- 
Thanks and Regards
Srikar Dronamraju

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