Make sure you have http://git.android-x86.org/?p=kernel/common.git;a=commit;h=5038d42d2e60c855cf5b097197d95adaa1269d32
The code-change also should make it somewhat clearer on how the checks end up happening. Cheers, -san On Thu, May 31, 2012 at 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. > >> >> > >> 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 > > -- > unsubscribe: android-kernel+unsubscr...@googlegroups.com > website: http://groups.google.com/group/android-kernel > -- San Mehat | Staff Software Engineer | s...@google.com | 415-366-6172 -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
