[PATCH v3] ALSA: control: Add memory consumption limit to user controls

[Jaroslav Kysela]

Dne 18. 04. 21 v 16:27 Takashi Sakamoto napsal(a):

> As you note, control component is not optional for card. However,
> control component is actually maintained as device component. As current
> card implementation maintains each component successfully, it's worth to
> investigate putting control-related members from card to unique
> structure behind private data of component. Additionally, when integrating
> control functionality, it's convenient to me that relevant stuffs are
> capsulated apart from card structure. In short, I'd like 'divide and
> conquer' method in code refactoring.

I guess, you may show us some code for comments (just a prototype - no full
implementation). As you noted, the separate allocations may save some space
depending on the slab implementation, but it should not be the main reason for
such changes.

The device objects were added to the ALSA control stack later (they simply
didn't exist when we designed it). Also, the low-level drivers communicate
with the control layer using the card structure pointer. The additional
translation is another challenge.

						Jaroslav

-- 
Jaroslav Kysela <perex at perex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.