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

[Jaroslav Kysela]

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'.

					Jaroslav

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