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authorCheng Xu <chengxu@linux.vnet.ibm.com>2011-05-14 14:20:02 +0800
committerIngo Molnar <mingo@elte.hu>2011-05-16 11:00:54 +0200
commitec514c487c3d4b652943da7b0afbc094eee08cfa (patch)
treed6766fd9a3f6eec2816a8191cf02f14564ba7473 /arch/mips/cavium-octeon/smp.c
parentbd1a643e10eb8782b36b47c3602300319dd2fb00 (diff)
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sched: Fix rt_rq runtime leakage bug
This patch is to fix the real-time scheduler bug reported at: https://lkml.org/lkml/2011/4/26/13 That is, when running multiple real-time threads on every logical CPUs and then turning off one CPU, the kernel will bug at function __disable_runtime(). Function __disable_runtime() bugs and reports leakage of rt_rq runtime. The root cause is __disable_runtime() assumes it iterates through all the existing rt_rq's while walking rq->leaf_rt_rq_list, which actually contains only runnable rt_rq's. This problem also applies to __enable_runtime() and print_rt_stats(). The patch is based on above analysis, appears to fix the problem, but is only lightly tested. Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Cheng Xu <chengxu@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/4DCE1F12.6040609@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/mips/cavium-octeon/smp.c')
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