On Mon, May 2, 2011 at 10:52 PM, <purusothaman.ramajothi@xxxxxxxxx> wrote: > Hi, > > > > I am using 2.6.27.18 kernel.My machine is powerpc > architecture.I executed the deep sleep operation by executing the following > command: > > > > “echo mem > /sys/power/state” > > > > The suspend opeartion was successful.All the devices and user level threads > are suspended. > > > > But sometimes during resume my machine hangs.This is not happening > regularly.But it occurs after 60 or 70 times of deep sleep operation.So for > debugging this I have added checkpoints in the flow of deep check.When this > issue was produced the kernel hangs around “thaw_tasks” or “schedule” > function of “thaw_processes”.These functions are defined in > “kernel/power/process.c”. > Have you enabled [Kernel hacking] ==> [Detect Hung Tasks] and waited more than 120 seconds after the hang? > > > Note: The final printk message “Restarting tasks.....done” was not displayed > when this issue occurred.But all the devices and drivers resumed back. > > > > I was not able to debug this as the reproduciablity rate was too low.Kindly > help me in solving the issue. Around 1/100 is not that low for a suspend/resume issue. Don't get too frustrated. You will probably encounter much rarer (let's say 1/10000) incidents if you are doing the job with newly produced chips and boards. :D If you have some H/W tracers similar as T32, try it. It helps a lot. > > > > Regards, > > Purusothaman R > > > > Please do not print this email unless it is absolutely necessary. > > The information contained in this electronic message and any attachments to > this message are intended for the exclusive use of the addressee(s) and may > contain proprietary, confidential or privileged information. If you are not > the intended recipient, you should not disseminate, distribute or copy this > e-mail. Please notify the sender immediately and destroy all copies of this > message and any attachments. > > WARNING: Computer viruses can be transmitted via email. The recipient should > check this email and any attachments for the presence of viruses. The > company accepts no liability for any damage caused by any virus transmitted > by this email. > > www.wipro.com > > _______________________________________________ > linux-pm mailing list > linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx > https://lists.linux-foundation.org/mailman/listinfo/linux-pm > -- MyungJoo Ham, Ph.D. Mobile Software Platform Lab, Digital Media and Communications (DMC) Business Samsung Electronics cell: 82-10-6714-2858 _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
