linux-kernel - Re: [PATCH 5/5] ALSA: firewire: use nonatomic PCM operation

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Message-ID: <20240905080814.GB486563@workstation.local>
Date: Thu, 5 Sep 2024 17:08:14 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: Takashi Iwai <tiwai@...e.de>
Cc: linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org,
	apais@...ux.microsoft.com, edmund.raile@...tonmail.com,
	linux-media@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] ALSA: firewire: use nonatomic PCM operation

On Wed, Sep 04, 2024 at 06:07:54PM +0200, Takashi Iwai wrote:
> On Wed, 04 Sep 2024 14:51:54 +0200,
> Takashi Sakamoto wrote:
> > 
> > In the former commits, the callback of isochronous context runs on usual
> > work process. In the case, ALSA PCM device has a flag, nonatomic, to
> > acquire mutex lock instead of spin lock for PCM substream group.
> > 
> > This commit uses the flag. It has an advantage in the case that ALSA PCM
> > application uses the large size of intermediate buffer, since it takes
> > too long time even in tasklet softIRQ to process many of isochronous
> > packets, then result in the delay of system event due to disabled IRQ so
> > long. It is avertible to switch to nonatomic operation.
> > 
> > Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
> 
> Feel free to take my ack:
> 
> Reviewed-by: Takashi Iwai <tiwai@...e.de>

Thanks for your ack ;)


Regards

Takashi Sakamoto