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SubjectRe: [GIT PULL rcu/next] rcu commits for 2.6.40
On 05/14/2011 09:14 PM, Yinghai Lu wrote:
> On 05/14/2011 11:34 AM, Paul E. McKenney wrote:
>>> and do the inspection afterwards.
>>
>> And here is a lightly-tested patch, which applies on tip/core/rcu.
>>
>> This problem could account for both the long delays seen with e59fb312
>> (Decrease memory-barrier usage based on semi-formal proof) and the
>> shorter delays seen with a26ac245 (move TREE_RCU from softirq to kthread).
>
> yes. it fixes the problem.
>
> for 1024g system when hotadd mem enabled in kernel config
>
> [ 31.814803] cpu_dev_init done
> [ 35.437163] memory_dev_init done
>
> even it is with gcc from opensuse 11.3

got:

[ 86.931217] Switched to NOHz mode on CPU #0
[ 86.931272] Switched to NOHz mode on CPU #25
[ 86.931278] ------------[ cut here ]------------
[ 86.931290] WARNING: at kernel/rcutree.c:364 rcu_enter_nohz+0x44/0x76()
[ 86.931294] Hardware name: Sun Fire X4800 M2
[ 86.931297] Modules linked in:
[ 86.931303] Pid: 0, comm: swapper Not tainted 2.6.39-rc7-tip-yh-04836-g5e42dc2-dirty #3
[ 86.931307] Call Trace:
[ 86.931333] [<ffffffff81080280>] warn_slowpath_common+0x85/0x9d
[ 86.931338] Switched to NOHz mode on CPU #74
[ 86.931346] [<ffffffff810802b2>] warn_slowpath_null+0x1a/0x1c
[ 86.931356] [<ffffffff810d3615>] rcu_enter_nohz+0x44/0x76
[ 86.931370] [<ffffffff810ab3cb>] tick_nohz_stop_sched_tick+0x27d/0x366
[ 86.931381] [<ffffffff810391bc>] cpu_idle+0x7a/0xcc
[ 86.931397] [<ffffffff81bd1aa3>] rest_init+0xb7/0xbe
[ 86.931408] [<ffffffff81bd19ec>] ? csum_partial_copy_generic+0x16c/0x16c
[ 86.931423] [<ffffffff82738e39>] start_kernel+0x3b2/0x3bd
[ 86.931428] Switched to NOHz mode on CPU #94
[ 86.931436] [<ffffffff827382cc>] x86_64_start_reservations+0x9c/0xa0
[ 86.931446] [<ffffffff827384a8>] x86_64_start_kernel+0x1d8/0x1e3
[ 86.931463] ---[ end trace 2cfc591bf7de931f ]---
[ 86.931598] Switched to NOHz mode on CPU #151
[ 86.931613] Switched to NOHz mode on CPU #152

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