Re: lowmemory android driver not needed?

[Trilok Soni]

Hi Greg,

On Thu, Jan 15, 2009 at 5:42 AM, Greg KH <greg@xxxxxxxxx> wrote:
> On Wed, Jan 14, 2009 at 03:32:38PM -0800, Arve Hjønnevåg wrote:
>> On Wed, Jan 14, 2009 at 3:17 PM, Greg KH <greg@xxxxxxxxx> wrote:
>> >> We actually use 6 different thresholds for killing processes. I don't
>> >> know what all the classes are, processes with a higher oom_adj value
>> >> can be killed with less impact to the user than processes with a lower
>> >> oom_adj value. The first few classes only affect latency when
>> >> switching apps, but later classes stop non critical background
>> >> services and finally the foreground app. Another reason to not kill
>> >> every process at the same threshold is that memory may not be free
>> >> immediately when the process is killed.
>> >
>> > But the lowmemorykiller android module doesn't have anything to do with
>> > this, right?
>> >
>>
>> It does. We write the thresholds to
>> /sys/module/lowmemorykiller/parameters/adj and
>> /sys/module/lowmemorykiller/parameters/minfree then set the oom_adj
>> value per process. If the standard oom killer can be adjusted in a
>> similar way, then we will not need the lowmemorykiller module.
>
> Great, care to document this somewhere so people like me don't get
> confused?

And there is one more lowmem driver developed by Nokia for Nokia 8xx
tablets it seems. CCed Tony Lindgren,  Juha and Viktor.

http://git.kernel.org/?p=linux/kernel/git/tmlind/linux-omap-2.6.git;a=blob;f=security/lowmem.c;h=ae78a530af39703e335ad769f1e6f097f63ec6dd;hb=HEAD

-- 
---Trilok Soni
http://triloksoni.wordpress.com
http://www.linkedin.com/in/triloksoni
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