Re: [PATCH 0/8] Suspend block api (version 6)

[Igor Stoppa <igor.stoppa@nokia.com>]

ext tytso@mit.edu wrote:

> On Mon, May 17, 2010 at 09:12:03AM -0700, Kevin Hilman wrote:
>   
>> The n900 *never* suspends.  It only uses dynamic PM + CPUidle.
>> The droid uses opportunistic suspend (as well as dynamic PM + CPUidle)
>>
>> I don't know of any more objective comparison of the two, but as a
>> user of both devices I can say that the active usage is basically the
>> same (around a day) and the idle use is similar as well, even though
>> the Droid has a slightly bigger battery (1400 mAh vs. 1320 mAh.)....
>>     
>
> Just for a bit of light amusement, although hopefully we've killed the
> meme that other platforms have absolutely no problems in this area
> without using something like suspend blockers,

If you are advocating QoS, I think it's a general agreement that 
something like that is needed.

If you are saying that suspend blockers - or the like - are needed, no, 
that is not true.
>  I offer for your
> consideration this thread from maemo-developers:
>
> http://lists.maemo.org/pipermail/maemo-developers/2010-May/026490.html
>
> Note how users conflate battery lifetime after downloading a random
> application with the platform being "stable".  I also was amazed that
> the thread degenerated into trying to detect processes that are taking
> 90% of the CPU.  It's not necessary for a process to be constantly
> running before it starts chewing up your battery, and if people think
> the "blame the victim" trick works (``It's the user's fault for
> "approving" the application by installing it!''), I suspect that
> the platform will be not be very successful...
>   
 From the thread - if i have not missed it - the user doesn't say if 
this is a newly flashed device or if he has done an upgrade of something 
he used to hack with. Erroneous settings might be an explanation there ...

Yes, I am blaming the victim, mostly out of previous experience in 
similar cases.

 From a platform pov I think this mostly proves the need to embed more 
self diagnostic in the system and have QoS.

igor