linux-kernel - Re: [alsa-devel] [RFC] [ALSA][CONTROL] Added 2 ioctls for reading/writing values of multiple controls in one go (at once)

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Date:   Thu, 2 Feb 2017 18:22:43 +0100
From:   Clemens Ladisch <clemens@...isch.de>
To:     Satendra Singh Thakur <satendra.t@...sung.com>
Cc:     alsa-devel@...a-project.org, ycheon.song@...sung.com,
        tiwai@...e.com, linux-kernel@...r.kernel.org,
        nishant.s4@...sung.com, hemanshu.s@...sung.com,
        o-takashi@...amocchi.jp
Subject: Re: [alsa-devel] [RFC] [ALSA][CONTROL] Added 2 ioctls for
 reading/writing values of multiple controls in one go (at once)

Satendra Singh Thakur wrote:
> -Added an ioctl to read values of multiple elements at once
> -Added an ioctl to write values of multiple elements at once
> -In the absence of above ioctls user needs to call N ioctls to
>  read/write value of N elements which requires N context switches

And why are these N context switches a problem?

> -Above mentioned ioctl will be useful for alsa utils such as amixer
>  which reads all controls of given sound card

Is there a noticeable difference?


Regards,
Clemens