On May 31, 10:47 am, Ken Chen <ken.chen....@gmail.com> wrote: > On Wed, May 30, 2012 at 3:56 AM, Kanishka Ariyapala > <kanishka...@gmail.com>wrote: > > > Thank you Ken for the reply. I created a cgroup under /dev/cpuctl and > > added a process to the tasks file. using echo PID > tasks. however it wont > > get registered there, of course the PID changes every time when the > > application is re-started. In my case I was testing with browser and the > > music player. Once you exit and come back the PID is gone. > > > <Ken>That's expected behavior of cgroup. > > Since NAME of the app is constant(ex - com.android.browser) I will have to> > get the PID from the task_struct I guess, and assign the PID. How ever what > > is the mechanism to make a process change between two cgroups? In a > > programmatical manner with out issuing echo PID. (can it be hard coded in > > the source..) > > > <Ken> Simply echo PID to new cgroup, it will be moved out from the > > previous one automatically. > > > I don't know if this is a stupid Q anyways, normal applications have the > > user name as something like app_XX is there any way of changing that to a > > root? through capabilities may be? > > CAP_SYS_NICE is defined in capability.h how do I know if it is granted to > > my process? if not granting it. (in the kernel space as well as inside the > > app) > > <Ken> You can not changing app_xx to root, but root can grant CAP_SYS_NICE > to app_xx. > > <DK> How can this be done? in the kernel source or in side the application > > > > > On Tue, May 29, 2012 at 4:17 PM, Ken Chen <ken.chen....@gmail.com> wrote: > > >> Currently, Android dalvik VM leverages cpu cgroup to determine whether to > >> use kernel scheduler policies, /dev/cpuctl is mounted in init.rc by > >> default. You can create a sub-cpu cgroup under /dev/cpuctl, and control the > >> priorization of processes there as long as your process is granted with > >> CAP_SYS_NICE capability or running as root. > > >> Ken > > >> On Mon, May 28, 2012 at 6:55 AM, Kanishka Ariyapala < > >> kanishka...@gmail.com> wrote: > > >>> after some googling came to know that android framework is it self using > >>> cgroups. Is it the reason for the device or resource busy error? > >>> Dose it mean that I won't be able to use cgroups? > > >>> On Mon, May 28, 2012 at 12:26 AM, DK <kanishka...@gmail.com> wrote: > > >>>> Hi, > > >>>> I have trouble configuring cgroups, please help! When I issue the > >>>> following command I get the error "mount: Device or resource busy" > > >>>> # mount -t cgroup -ocpu none /dev/cpuctl > > >>>> These are the configurations options that I have enabled. > > >>>> CONFIG_GROUP_SCHED=y > >>>> CONFIG_FAIR_GROUP_SCHED=y > >>>> CONFIG_RT_GROUP_SCHED=y > >>>> # CONFIG_USER_SCHED is not set > >>>> CONFIG_CGROUP_SCHED=y > >>>> CONFIG_CGROUPS=y > >>>> CONFIG_CGROUP_DEBUG=y > >>>> CONFIG_CGROUP_NS=y > >>>> CONFIG_CGROUP_FREEZER=y > >>>> CONFIG_CGROUP_DEVICE=y > >>>> CONFIG_CGROUP_CPUACCT=y > >>>> CONFIG_RESOURCE_COUNTERS=y > >>>> CONFIG_CGROUP_MEM_RES_CTLR=y > >>>> CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y > >>>> CONFIG_MM_OWNER=y > > >>>> Why is mount saying device busy? > > >>>> note: I was following the steps in the documentation(sched-design- > >>>> CFS.txt) > > >>>> Regards, > >>>> Kanishka > > >>>> -- > >>>> unsubscribe: android-kernel+unsubscr...@googlegroups.com > >>>> website:http://groups.google.com/group/android-kernel > > >>> -- > >>> unsubscribe: android-kernel+unsubscr...@googlegroups.com > >>> website:http://groups.google.com/group/android-kernel > > >> -- > > >> -- Ken Chen > > >> -- > >> unsubscribe: android-kernel+unsubscr...@googlegroups.com > >> website:http://groups.google.com/group/android-kernel > > > -- > > unsubscribe: android-kernel+unsubscr...@googlegroups.com > > website:http://groups.google.com/group/android-kernel > > -- > > -- Ken Chen
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