linux-kernel - Re: [PATCH v2 2/2] ALSA: set no sound proc fs for reduced memory footprint

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Date:	Wed, 27 May 2015 09:22:41 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	"Jie, Yang" <yang.jie@...el.com>
Cc:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Girdwood, Liam R" <liam.r.girdwood@...el.com>,
	"Zhang, Vivian" <vivian.zhang@...el.com>
Subject: Re: [PATCH v2 2/2] ALSA: set no sound proc fs for reduced memory footprint

At Wed, 27 May 2015 07:09:24 +0000,
Jie, Yang wrote:
> 
> > -----Original Message-----
> > From: Takashi Iwai [mailto:tiwai@...e.de]
> > Sent: Wednesday, May 27, 2015 2:19 PM
> > To: Jie, Yang
> > Cc: Sudip Mukherjee; broonie@...nel.org; alsa-devel@...a-project.org;
> > linux-kernel@...r.kernel.org; Girdwood, Liam R; Zhang, Vivian
> > Subject: Re: [PATCH v2 2/2] ALSA: set no sound proc fs for reduced memory
> > footprint
> > 
> > At Wed, 27 May 2015 05:38:01 +0000,
> > Jie, Yang wrote:
> > >
> > > > -----Original Message-----
> > > > From: Sudip Mukherjee [mailto:sudipm.mukherjee@...il.com]
> > > > Sent: Wednesday, May 27, 2015 12:50 PM
> > > > To: Jie, Yang
> > > > Cc: tiwai@...e.de; broonie@...nel.org; alsa-devel@...a-project.org;
> > > > linux- kernel@...r.kernel.org; Girdwood, Liam R; Zhang, Vivian
> > > > Subject: Re: [PATCH v2 2/2] ALSA: set no sound proc fs for reduced
> > > > memory footprint
> > > >
> > > > On Tue, May 26, 2015 at 09:13:57PM +0800, Jie Yang wrote:
> > > > > Disable sound proc fs, when CONFIG_SND_NO_PROC_FS is selected,
> > > > > which can save about 9KB memory size for reducing memory footprint
> > purpose.
> > > > > ---
> > > > missing Signed-off-by.
> > >
> > > Thanks for pointing out.
> > >
> > > Signed-off-by: Jie Yang <yang.jie@...el.com>
> > >
> > > Takashi, do I need to resend them?
> > 
> > Yes, but you seen to have missed my first comment.  Here again:
>  
> Sorry about the missing. :)
> 
> > 
> > ==========================================================
> > ======
> > > +menuconfig SND_REDUCED_MEMORY_FOOTPRINT
> > > +	bool "Reduced Memory Footprint Support"
> > > +	default n
> > > +	help
> > > +	  Say 'Y' to enable Reduced Memory Footprint Support, which may
> > > +	  reduce code size and data footprint as much as possible.
> > 
> > I'd like to move this into sound/core.
> > Also, the kconfig name appears a bit too lengthy to me.
> > ==========================================================
> > ======
> > 
> > And, after reading this again, I wonder whether we just take the existing
> > CONFIG_EXPERT for allowing the selection of more knobs like
> > CONFIG_SND_PROC_FS.
> > 
> > SND_PROC_FS
> > 	bool "Sound proc file" if EXPERT
>  
> Sounds good. Then we don't need 'SND_REDUCED_MEMORY_FOOTPRINT'
> any more? Or we can keep it as root menu of the set of items, just as below?
> (I changed it to SND_SMALL_FOOTPRINT, as your comment above)

I originally thought to select items from SND_SMALL_FOOTPRINT, but
this doesn't seem to work.  At least, "de"selecting isn't supported by
Kconfig (i.e. set SND_PROC_FS=n when SND_SMALL_FOOTPRINT=y).
We may have SND_NO_PROC_FS and select it, but it's too bad.

So, IMO, we can drop SND_SMALL_FOOTPRINT but let users choose each
knob when EXPERT=y.


Takashi
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