Messages in this thread | | | Date | Sat, 14 May 2011 22:41:29 -0700 | From | Yinghai Lu <> | Subject | Re: [GIT PULL rcu/next] rcu commits for 2.6.40 |
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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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