linux-kernel - Re: [PATCH] sound, core, pcm_lib: xrun_log: log also in

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Date:	Wed, 18 May 2011 17:13:32 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Ben Gardiner <bengardiner@...ometrics.ca>
Cc:	alsa-devel@...a-project.org, Jaroslav Kysela <perex@...ex.cz>,
	Clemens Ladisch <clemens@...isch.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sound, core, pcm_lib: xrun_log: log also in_interrupt

At Wed, 18 May 2011 10:03:34 -0400,
Ben Gardiner wrote:
> 
> When debugging pcm drivers I found the "period" or "hw" prefix printed
> by either XRUN_DEBUG_PERIODUPDATE or XRUN_DEBUG_PERIODUPDATE events, 
> respectively to be very useful is observing the interplay between
> interrupt-context updates and syscall-context updates.
> 
> Similarly, when debugging overruns with XRUN_DEBUG_LOG it is useful to
> see the context of the last 10 positions.
> 
> Add an in_interrupt member to hwptr_log_entry which stores the value of
> the in_interrupt parameter of snd_pcm_update_hw_ptr0 when the log entry
> is created. Print a "[Q]" prefix when dumping the log entries if
> in_interrupt was true.
> 
> Signed-off-by: Ben Gardiner <bengardiner@...ometrics.ca>

Looks good to me.  Applied now.
Thanks!


Takashi

> ---
>  sound/core/pcm_lib.c |   12 ++++++++----
>  1 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
> index 64449cb..c8c8091 100644
> --- a/sound/core/pcm_lib.c
> +++ b/sound/core/pcm_lib.c
> @@ -189,6 +189,7 @@ static void xrun(struct snd_pcm_substream *substream)
>  #define XRUN_LOG_CNT	10
>  
>  struct hwptr_log_entry {
> +	unsigned int in_interrupt;
>  	unsigned long jiffies;
>  	snd_pcm_uframes_t pos;
>  	snd_pcm_uframes_t period_size;
> @@ -204,7 +205,7 @@ struct snd_pcm_hwptr_log {
>  };
>  
>  static void xrun_log(struct snd_pcm_substream *substream,
> -		     snd_pcm_uframes_t pos)
> +		     snd_pcm_uframes_t pos, int in_interrupt)
>  {
>  	struct snd_pcm_runtime *runtime = substream->runtime;
>  	struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
> @@ -220,6 +221,7 @@ static void xrun_log(struct snd_pcm_substream *substream,
>  			return;
>  	}
>  	entry = &log->entries[log->idx];
> +	entry->in_interrupt = in_interrupt;
>  	entry->jiffies = jiffies;
>  	entry->pos = pos;
>  	entry->period_size = runtime->period_size;
> @@ -246,9 +248,11 @@ static void xrun_log_show(struct snd_pcm_substream *substream)
>  		entry = &log->entries[idx];
>  		if (entry->period_size == 0)
>  			break;
> -		snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
> +		snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
>  			   "hwptr=%ld/%ld\n",
> -			   name, entry->jiffies, (unsigned long)entry->pos,
> +			   name, entry->in_interrupt ? "[Q] " : "",
> +			   entry->jiffies,
> +			   (unsigned long)entry->pos,
>  			   (unsigned long)entry->period_size,
>  			   (unsigned long)entry->buffer_size,
>  			   (unsigned long)entry->old_hw_ptr,
> @@ -326,7 +330,7 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
>  	}
>  	pos -= pos % runtime->min_align;
>  	if (xrun_debug(substream, XRUN_DEBUG_LOG))
> -		xrun_log(substream, pos);
> +		xrun_log(substream, pos, in_interrupt);
>  	hw_base = runtime->hw_ptr_base;
>  	new_hw_ptr = hw_base + pos;
>  	if (in_interrupt) {
> -- 
> 1.7.4.1
> 
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