On Wednesday 18 August 2010 03:52 AM, Manikandan Ramachandran wrote:
I see a scenario where higher priority task is ready to run but lower priority IRQ thread is hogging the cpu. Please see the timeline log below:
Can you try turning on RCU_CPU_STALL_DETECTION to get any trace which might have hogged the cpu too long. Also make sure that sirq-rcu is running at little more prio than your high prio task. Thanks, Gowri
GIVE ffff0c1c [Comment: High priority IRQ thread wakes up high priority process at jiffy 0xffff0c1c] **ffff0c21**##ffff0c21##**ffff0c21**##ffff0c21##**ffff0c21**##ffff0c21##**ffff0c21**##ffff0c21##**ffff0c21**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c22**##ffff0c22##**ffff0c23**##ffff0c23##**ffff0c23**##ffff0c23##**ffff0c23**##ffff0c24##**ffff0c24**##ffff0c24##**ffff0c24**##ffff0c24## [Comment: Low priority IDE[ide_intr] handler hogs CPU for almost 3 ms] GOTffff0c26 [Comment: High priority task wakes up after 10 ms!!] I fail to understand why scheduler failed to schedule high priority task 10 times in a row. FYI, I have put IDE thread to SCHED_NORMAL while high priority thread and task to SCHED_FIFO.
-- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
