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

From: Clemens Ladisch
Date: Thu Feb 02 2017 - 12:28:55 EST


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