Messages in this thread | | | Date | Tue, 14 Jul 2015 09:31:54 -0400 | From | Steven Rostedt <> | Subject | Re: [RFC 2/3] arm64: refactor save_stack_trace() |
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On Tue, 14 Jul 2015 21:47:10 +0900 Jungseok Lee <jungseoklee85@gmail.com> wrote:
> Is the below example an unexpected result? > Entry 17 and 18 are ftrace_call and ftrace_ops_no_ops, respectively. > > Depth Size Location (51 entries) > ----- ---- -------- > 0) 5352 96 _raw_spin_unlock_irqrestore+0x1c/0x60 > 1) 5256 48 gic_raise_softirq+0xa0/0xbc > 2) 5208 80 smp_cross_call+0x40/0xbc > 3) 5128 48 smp_send_reschedule+0x38/0x48 > 4) 5080 32 trigger_load_balance+0x184/0x29c > 5) 5048 112 scheduler_tick+0xac/0x104 > 6) 4936 64 update_process_times+0x5c/0x74 > 7) 4872 32 tick_sched_handle.isra.15+0x38/0x7c > 8) 4840 48 tick_sched_timer+0x48/0x90 > 9) 4792 48 __run_hrtimer+0x60/0x258 > 10) 4744 64 hrtimer_interrupt+0xe8/0x260 > 11) 4680 128 arch_timer_handler_virt+0x38/0x48 > 12) 4552 32 handle_percpu_devid_irq+0x84/0x188 > 13) 4520 64 generic_handle_irq+0x38/0x54 > 14) 4456 32 __handle_domain_irq+0x68/0xbc > 15) 4424 64 gic_handle_irq+0x38/0x88 > 16) 4360 280 el1_irq+0x64/0xd8
Note, function tracing does not disable interrupts. This looks to be that an interrupt came in while __aloc_skb() was being traced.
-- Steve
> 17) 4080 168 ftrace_ops_no_ops+0xb4/0x16c > 18) 3912 32 ftrace_call+0x0/0x4 > 19) 3880 144 __alloc_skb+0x48/0x180 > 20) 3736 96 alloc_skb_with_frags+0x74/0x234 > 21) 3640 112 sock_alloc_send_pskb+0x1d0/0x294 > 22) 3528 160 sock_alloc_send_skb+0x44/0x54 > 23) 3368 64 __ip_append_data.isra.40+0x78c/0xb48 > 24) 3304 224 ip_append_data.part.42+0x98/0xe8 > 25) 3080 112 ip_append_data+0x68/0x7c > 26) 2968 96 icmp_push_reply+0x7c/0x144 > 27) 2872 96 icmp_send+0x3c0/0x3c8 > 28) 2776 192 __udp4_lib_rcv+0x5b8/0x684 > 29) 2584 96 udp_rcv+0x2c/0x3c > 30) 2488 32 ip_local_deliver+0xa0/0x224 > 31) 2456 48 ip_rcv+0x360/0x57c > 32) 2408 64 __netif_receive_skb_core+0x4d0/0x80c > 33) 2344 128 __netif_receive_skb+0x24/0x84 > 34) 2216 32 process_backlog+0x9c/0x15c > 35) 2184 80 net_rx_action+0x1ec/0x32c > 36) 2104 160 __do_softirq+0x114/0x2f0 > 37) 1944 128 do_softirq+0x60/0x68 > 38) 1816 32 __local_bh_enable_ip+0xb0/0xd4 > 39) 1784 32 ip_finish_output+0x1f4/0xabc > 40) 1752 96 ip_output+0xf0/0x120 > 41) 1656 64 ip_local_out_sk+0x44/0x54 > 42) 1592 32 ip_send_skb+0x24/0xbc > 43) 1560 48 udp_send_skb+0x1b4/0x2f4 > 44) 1512 80 udp_sendmsg+0x2a8/0x7a0 > 45) 1432 272 inet_sendmsg+0xa0/0xd0 > 46) 1160 48 sock_sendmsg+0x30/0x78 > 47) 1112 32 ___sys_sendmsg+0x15c/0x26c > 48) 1080 400 __sys_sendmmsg+0x94/0x180 > 49) 680 320 SyS_sendmmsg+0x38/0x54 > 50) 360 360 el0_svc_naked+0x20/0x28 > > Best Regards > Jungseok Lee
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