Messages in this thread | | | Date | Mon, 23 May 2011 15:58:45 -0700 | From | Yinghai Lu <> | Subject | Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof" |
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On 05/23/2011 03:55 PM, Yinghai Lu wrote: > On 05/23/2011 03:01 PM, Yinghai Lu wrote: >> On 05/23/2011 02:25 PM, Paul E. McKenney wrote: >>> On Mon, May 23, 2011 at 01:14:22PM -0700, Yinghai Lu wrote: >>>> On 05/21/2011 07:08 AM, Paul E. McKenney wrote: >>>>> On Sat, May 21, 2011 at 06:18:44AM -0700, Paul E. McKenney wrote: >>>>>> On Fri, May 20, 2011 at 05:02:40PM -0700, Yinghai Lu wrote: >>>>>>> On 05/20/2011 04:49 PM, Paul E. McKenney wrote: >>>>>>>> On Fri, May 20, 2011 at 04:16:28PM -0700, Yinghai Lu wrote: >>>>>>> ... >>>>>>>>> >>>>>>>>> the same one i sent out before, but let DEBUG_LOCKING_API_SELFTESTS disabled. >>>>>>>> >>>>>>>> OK, just to make sure I understand... You are compiling exactly the >>>>>>>> same kernel source tree with exactly the same .config, just with two >>>>>>>> different versions of gcc, correct? >>>>>>> yes. >>>>>>>> >>>>>>>> If so, it is quite possible that the slow one is the correct one. :-/ >>>>>>> yeah, new version always have problem. >>>>>>> >>>>>>> looks like opensuse11.3 has 4.5.0 and fedora14 has 4.5.1 >>>>>> >>>>>> OK, so fedora14 is the fast one (4.5.1) and opensuse11.3 is the slow >>>>>> one (4.5.0), correct? >>>>> >>>>> And does commit c7a3786030 help? This commit (from Peter Zijlstra) >>>>> tidied up RCU kthreads' scheduler interactions. The patch is below, >>>>> though it is probably more convenient to pull it from the rcu/next >>>>> branch of: >>>>> >>>>> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git >>>>> >>> > gcc in Fedora 14 is fine with your tree. >
sorry, I should wait for longer to see Fedora 14 is ok.
got same warning with the one compiled from fedora 14...
[ 372.937251] INFO: task rcun0:8 blocked for more than 120 seconds. [ 372.937618] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 372.956130] rcun0 D 0000000000000000 0 8 2 0x00000000 [ 372.956498] ffff882070d65e90 0000000000000046 ffff882070d64000 0000000000004000 [ 372.956528] 00000000001d1f40 ffff882070d65fd8 00000000001d1f40 ffff882070d65fd8 [ 372.956555] 0000000000004000 00000000001d1f40 ffff882070d18000 ffff882070d6a2b0 [ 372.956581] Call Trace: [ 372.956605] [<ffffffff810afce3>] ? __lock_release+0x166/0x16f [ 372.956624] [<ffffffff81c229d1>] ? _raw_spin_unlock_irqrestore+0x3f/0x46 [ 372.956639] [<ffffffff810ce941>] ? rcu_cpu_kthread_should_stop+0x137/0x137 [ 372.956650] [<ffffffff810adfd5>] ? trace_hardirqs_on+0xd/0xf [ 372.956661] [<ffffffff810ce941>] ? rcu_cpu_kthread_should_stop+0x137/0x137 [ 372.956673] [<ffffffff8109a0a5>] kthread+0x8c/0xa8 [ 372.956689] [<ffffffff81c2a754>] kernel_thread_helper+0x4/0x10 [ 372.956701] [<ffffffff81c22c80>] ? retint_restore_args+0xe/0xe [ 372.956711] [<ffffffff8109a019>] ? __init_kthread_worker+0x5b/0x5b [ 372.956722] [<ffffffff81c2a750>] ? gs_change+0xb/0xb [ 372.956726] INFO: lockdep is turned off. [ 492.750827] INFO: task rcun0:8 blocked for more than 120 seconds. [ 492.751150] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 492.762991] rcun0 D 0000000000000000 0 8 2 0x00000000 [ 492.763264] ffff882070d65e90 0000000000000046 ffff882070d64000 0000000000004000 [ 492.763294] 00000000001d1f40 ffff882070d65fd8 00000000001d1f40 ffff882070d65fd8 [ 492.763320] 0000000000004000 00000000001d1f40 ffff882070d18000 ffff882070d6a2b0 [ 492.763346] Call Trace: [ 492.763359] [<ffffffff810afce3>] ? __lock_release+0x166/0x16f [ 492.763371] [<ffffffff81c229d1>] ? _raw_spin_unlock_irqrestore+0x3f/0x46 [ 492.763382] [<ffffffff810ce941>] ? rcu_cpu_kthread_should_stop+0x137/0x137 [ 492.763393] [<ffffffff810adfd5>] ? trace_hardirqs_on+0xd/0xf [ 492.763404] [<ffffffff810ce941>] ? rcu_cpu_kthread_should_stop+0x137/0x137 [ 492.763414] [<ffffffff8109a0a5>] kthread+0x8c/0xa8 [ 492.763427] [<ffffffff81c2a754>] kernel_thread_helper+0x4/0x10 [ 492.763439] [<ffffffff81c22c80>] ? retint_restore_args+0xe/0xe [ 492.763449] [<ffffffff8109a019>] ? __init_kthread_worker+0x5b/0x5b [ 492.763460] [<ffffffff81c2a750>] ? gs_change+0xb/0xb [ 492.763463] INFO: lockdep is turned off.
if reverting PeterZ's patch will not have that warning.
Thanks
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