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authorZhang, Yanmin <yanmin_zhang@linux.intel.com>2008-09-09 11:26:33 +0800
committerIngo Molnar <mingo@elte.hu>2008-09-11 09:34:28 +0200
commitbaf25731e54d06eb13dc4eda78c6dc7da4ce84e8 (patch)
treeaf5cbd2b004a2258ebfd332d4871249d1c32f41f /kernel/kexec.c
parent291c54ff764d12ecc9a916cb478a0bbb45c5990e (diff)
sched: fix 2.6.27-rc5 couldn't boot on tulsa machine randomly
On my tulsa x86-64 machine, kernel 2.6.25-rc5 couldn't boot randomly. Basically, function __enable_runtime forgets to reset rt_rq->rt_throttled to 0. When every cpu is up, per-cpu migration_thread is created and it runs very fast, sometimes to mark the corresponding rt_rq->rt_throttled to 1 very quickly. After all cpus are up, with below calling chain: sched_init_smp => arch_init_sched_domains => build_sched_domains => ... => cpu_attach_domain => rq_attach_root => set_rq_online => ... => _enable_runtime _enable_runtime is called against every rt_rq again, so rt_rq->rt_time is reset to 0, but rt_rq->rt_throttled might be still 1. Later on function do_sched_rt_period_timer couldn't reset it, and all RT tasks couldn't be scheduled to run on that cpu. here is RT task migration_thread which is woken up when a task is migrated to another cpu. Below patch fixes it against 2.6.27-rc5. Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/kexec.c')
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