linux-kernel - Re: [ANNOUNCE] System Inactivity Monitor v1.0

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Date:	Mon, 29 Jan 2007 23:42:08 +0100
From:	Alessandro Di Marco <dmr@....it>
To:	Pavel Machek <pavel@....cz>
Cc:	Vojtech Pavlik <vojtech@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [ANNOUNCE] System Inactivity Monitor v1.0

Pavel Machek <pavel@....cz> writes:

   Hi!

   >    The /proc/bus/input/devices has an extensible structure. You can just
   >    add an "A:" line (for Activity) instead of adding a new proc file.
   > 
   > I know, but IMO there is too much stuff to parse in there. Activity counters
   > are frequently accessed by daemons, and four or five concurrent daemons are the
   > norm in a typical X11 linux box...

   Syscalls are fast enough, and the file is _very_ easy (=> fast) to parse.

   >    Also, the activity counters should IMO coincide with the event times
   >    passed through /dev/input/event, and should not be jiffies based.
   >    Ideally, both should be based on clock_gettime(CLOCK_MONOTONIC).
   > 
   > In evdev.c do_gettimeofday() is used. Anyway I just need of a monotonic
   > counter, so get_jiffies_64() wouldn't be better? It isn't affected by wrapping
   > issues and it is probably faster than do_gtod().

   Just use same time source rest of inputs already do...

OK, but what about the time-warp problem?. To fix it I need to know when the
system goes to sleep/resumes. In SIN I've solved via the platform driver,
introducing suspend() resume() callbacks...

greets,

-- 
Technology is dominated by two types of people: those who understand what they
do not manage, and those who manage what they do not understand. - Putt's Law
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