On Thu, Jan 15, 2009 at 07:02:48PM +0530, Trilok Soni wrote: > 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 As we can't stack LSMs, using the lsm interface for a simple memory driver seems pretty wasteful :) thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
