Date: Wed, 14 Jan 2009 16:12:24 -0800
From: Greg KH <greg@kroah.com>
To: Arve =?iso-8859-1?B?SGr4bm5lduVn?= <arve@android.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, Pavel Machek <pavel@suse.cz>,
       Brian Swetland <swetland@google.com>, arve@google.com,
       San Mehat <san@android.com>, Robert Love <rlove@google.com>,
       linux-kernel@vger.kernel.org
Subject: Re: lowmemory android driver not needed?
Message-ID: <20090115001224.GC11328@kroah.com>
References: <20090114010223.GA21380@kroah.com> <20090114021801.GA14759@bulgaria.corp.google.com> <d6200be20901131830r7103ff8eoe0314f9faf89d89b@mail.gmail.com> <20090114035237.GB16442@kroah.com> <20090114104307.GA20451@elf.ucw.cz> <20090114104834.18387fca@lxorguk.ukuu.org.uk> <d6200be20901141426r1d48ea33gc9a380451e4aaf93@mail.gmail.com> <20090114231739.GB24111@kroah.com> <d6200be20901141532y6f236104kd521041d640c152e@mail.gmail.com>
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On Wed, Jan 14, 2009 at 03:32:38PM -0800, Arve Hj?nnev?g wrote:
> On Wed, Jan 14, 2009 at 3:17 PM, Greg KH <greg@kroah.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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