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

[Takashi Iwai]

On Fri, 09 Apr 2021 15:34:14 +0200,
Jaroslav Kysela wrote:
> 
> Dne 09. 04. 21 v 12:59 Takashi Iwai napsal(a):
> 
> >> 5. add any mechanism to bind lifetime of user-defined element set to user
> >>    process
> >>
> >> At present, the lifetime of user-defined element set is bound to card
> >> itself. However, it's convenient to user processes to bind the lifetime
> >> to process itself. I add any mechanism for it.
> >>
> >> For recent years I've made some patches in house but never arrive at the
> >> best one. In the patches, I utilize access flags but in general the
> >> maintenance of lifetime is not easy issue. I tackle again in this time.
> > 
> > It sounds interesting, but I don't know how easily you can manage it.
> > The driver doesn't care much about the user process lifetime, but
> > mostly concentrate on the file handle...
> 
> It should be easy to trace which process created the user element and
> automatically remove this element when the process close the file descriptor.
> Something like 'bind lifetime of the control to the active control file
> descriptor'.

If it's tied only with the file handle, it's easy.  But I thought this
is about the process?


Takashi