linux-kernel - Re: [PATCH 1/8] PM: Opportunistic suspend support.

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Message-ID: <alpine.LFD.2.00.1005261948290.2995@localhost.localdomain>
Date:	Wed, 26 May 2010 19:51:17 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	James Bottomley <James.Bottomley@...e.de>
cc:	Peter Zijlstra <peterz@...radead.org>, Pavel Machek <pavel@....cz>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Florian Mickler <florian@...kler.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Tejun Heo <tj@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nigel Cunningham <nigel@...onice.net>,
	Ming Lei <tom.leiming@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-doc@...r.kernel.org, Matthew Garrett <mjg59@...f.ucam.org>,
	Greg KH <gregkh@...e.de>, tytso@....edu
Subject: Re: [PATCH 1/8] PM: Opportunistic suspend support.

On Wed, 26 May 2010, James Bottomley wrote:
> On Wed, 2010-05-26 at 19:01 +0200, Peter Zijlstra wrote:
> > On Wed, 2010-05-26 at 18:59 +0200, Pavel Machek wrote:
> > > On Wed 2010-05-26 18:28:28, Peter Zijlstra wrote:
> > > > On Wed, 2010-05-26 at 11:18 -0500, James Bottomley wrote:
> > > > > > Or make the suspend manager a C proglet and provide a JNI interface,
> > > > > > or whatever.
> > > > > 
> > > > > It's a fairly large piece of code to try to rewrite in C, so I don't
> > > > > think that's feasible on a reasonable timescale.  Android does have the
> > > > > concept of special sockets that can be used to communicate from less to
> > > > > more privileged processes (it has a very segmented runtime model), so
> > > > > these might be usable ... they have a drawback that they're essentially
> > > > > named pipes, so no multiplexing, but one per suspend influencing C
> > > > > process shouldn't be a huge burden. 
> > > > 
> > > > It wouldn't need to convert the whole Frameworks layer into C, just
> > > > enough to manage the suspend state.
> > > > 
> > > > Anyway, I think there's been enough arguments against even the concept
> > > > of opportunistic/auto-suspend, and I for one will object with a NAK if
> > > > Rafael send this to Linus.
> > > 
> > > It was submitted already. I tried to followup with NAK, but can't
> > > currently see it in the archive.
> 
> You mean this one:
> 
> https://lists.linux-foundation.org/pipermail/linux-pm/2010-May/025689.html
> 
> ?
> 
> > It was apparently hidden on some funky list.
> 
> Sending a PM pull request to the PM list doesn't really strike me as the
> height of obfuscation.  Plus almost everyone who objected was on the cc
> list.
> 
> >  Hiding pull requests is bad enough, but hiding pull requests for
> > contended features is just plain wrong.
> 
> I don't think it's a conspiracy ... just standard operating procedure
> for this subsystem.  I do think cc'ing lkml is good practise (having
> been yelled at for not doing that in the past) but it's certainly not
> universal practise.

At least it would be good style for a topic which is

   1) contended like this one

   2) pushing an intrusive feature last minute which has been merged
      into the pm tree barely two days ago.

Darn, _we_ have to deal with that forever as it sets a crappy user
space ABI in stone.

Thanks,

	tglx
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