linux-kernel - Re: lowmemory android driver not needed?

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Date:	Wed, 14 Jan 2009 15:32:38 -0800
From:	"Arve Hjønnevåg" <arve@...roid.com>
To:	"Greg KH" <greg@...ah.com>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Pavel Machek" <pavel@...e.cz>,
	"Brian Swetland" <swetland@...gle.com>, arve@...gle.com,
	"San Mehat" <san@...roid.com>, "Robert Love" <rlove@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: lowmemory android driver not needed?

On Wed, Jan 14, 2009 at 3:17 PM, Greg KH <greg@...ah.com> 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.

-- 
Arve Hjønnevåg
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