On Sat, 29 Jan 2011 18:17:56 +0530 Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> wrote: > On Fri, Jan 28, 2011 at 8:52 AM, KAMEZAWA Hiroyuki > <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote: > > > > On recent -mm, when I run make -j 8 under 200M limit of memcg, as > > == > > # mount -t cgroup none /cgroup/memory -o memory > > # mkdir /cgroup/memory/A > > # echo 200M > /cgroup/memory/A/memory.limit_in_bytes > > # echo $$ > /cgroup/memory/A/tasks > > # make -j 8 kernel > > == > > > > I see hangs with khugepaged. That's because memcg's memory reclaim > > routine doesn't handle HUGE_PAGE request in proper way. And khugepaged > > doesn't know about memcg. > > > > This patch set is for fixing above hang. Patch 1-3 seems obvious and > > has the same concept as patches in RHEL. > > Do you have any backtraces? Are they in the specific patches? > Jan 18 10:28:29 rhel6-test kernel: [56245.286007] INFO: rcu_sched_state detected stall on CPU 0 (t=60000 jiffies) Jan 18 10:28:29 rhel6-test kernel: [56245.286007] sending NMI to all CPUs: Jan 18 10:28:29 rhel6-test kernel: [56245.286007] NMI backtrace for cpu 0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] CPU 0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8102a04e>] arch_trigger_all_cpu_bac ktrace+0x5e/0xa0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff810bca09>] __rcu_pending+0x169/0x3b 0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8108a250>] ? tick_sched_timer+0x0/0 xc0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff810bccbc>] rcu_check_callbacks+0x6c /0x120 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff810689a8>] update_process_times+0x4 8/0x90 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8108a2b6>] tick_sched_timer+0x66/0x c0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8107ede0>] __run_hrtimer+0x90/0x1e0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff81032db9>] ? kvm_clock_get_cycles+0 x9/0x10 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8107f1be>] hrtimer_interrupt+0xde/0 x240 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8155268b>] smp_apic_timer_interrupt +0x6b/0x9b Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8100c9d3>] apic_timer_interrupt+0x13/0x20 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] <EOI> Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff810a726a>] ? res_counter_charge+0xda/0x100 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff81145459>] __mem_cgroup_try_charge+0x199/0x5d0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff811463b5>] mem_cgroup_newpage_charge+0x45/0x50 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8113dbd4>] khugepaged+0x924/0x1430 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8107af00>] ? autoremove_wake_function+0x0/0x40 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8113d2b0>] ? khugepaged+0x0/0x1430 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8107a8b6>] kthread+0x96/0xa0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8100ce24>] kernel_thread_helper+0x4/0x10 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8107a820>] ? kthread+0x0/0xa0 Jan 18 10:28:29 rhel6-test kernel: [56245.286007] [<ffffffff8100ce20>] ? kernel_thread_helper+0x0/0x10 Thanks, -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>