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

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Message-ID: <E7B1D079BA13FB44A978CC8F69C7D6A90553AF9C@SHSMSX101.ccr.corp.intel.com>
Date:	Wed, 27 May 2015 07:40:24 +0000
From:	"Jie, Yang" <yang.jie@...el.com>
To:	Takashi Iwai <tiwai@...e.de>
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

> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai@...e.de]
> Sent: Wednesday, May 27, 2015 3:23 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 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.
 
Firstly, I used sound/Kconfig but not sound/core/Kconfig, because some
efforts for reducing footprint are based on sound/asoc/(e.g. dapm, dpcm,
...).

Secondly, if we drop SND_SMALL_FOOTPRINT, then we have to add
several(may up to ~10) knobs under the sound menu(Sound Card Support),
which looks messy and not neat.

~Keyon

> 
> 
> Takashi
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