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

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Date:	Wed, 14 Jan 2009 16:12:24 -0800
From:	Greg KH <greg@...ah.com>
To:	Arve Hjønnevåg <arve@...roid.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 03:32:38PM -0800, Arve Hjønnevåg wrote:
> 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.

Great, care to document this somewhere so people like me don't get
confused?

thanks,

greg k-h
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