log如下：
[335594.340000] [<801e4c18>] net_rx_action+0x10c/0x1e0
[335594.340000] [<800269f8>] __do_softirq+0xf8/0x230
[335594.340000] [<80026d64>] irq_exit+0x54/0x70
[335594.340000] [<80004830>] ret_from_irq+0x0/0x4
[335594.340000] [<86889118>] 0x86889118
[335594.340000]
[335594.340000] Mem-Info:
[335594.340000] Normal per-cpu:
[335594.340000] CPU 0: hi: 42, btch: 7 usd: 43
[335594.340000] active_anon:648 inactive_anon:12 isolated_anon:0
[335594.340000] active_file:2208 inactive_file:1969 isolated_file:0
[335594.340000] unevictable:0 dirty:0 writeback:0 unstable:0
[335594.340000] free:132 slab_reclaimable:417 slab_unreclaimable:23834
[335594.340000] mapped:1049 shmem:26 pagetables:78 bounce:0
[335594.340000] free_cma:0
[335594.340000] Normal free:528kB min:1420kB low:1772kB high:2128kB active_anon:2592kB inactive_anon:48kB active_file:8832kB inactive_file:7876kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:126452kB mlocked:0kB dirty:0kB writeback:0kB mapped:4196kB shmem:104kB slab_reclaimable:1668kB slab_unreclaimable:95336kB kernel_stack:368kB pagetables:312kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[335594.340000] lowmem_reserve[]: 0 0
[335594.340000] Normal: 04kB 08kB 116kB ® 032kB 064kB 2128kB ® 1256kB ® 0512kB 01024kB 02048kB 04096kB = 528kB
[335594.340000] 4203 total pagecache pages
[335594.340000] 0 pages in swap cache
[335594.340000] Swap cache stats: add 0, delete 0, find 0/0
[335594.340000] Free swap = 0kB
[335594.340000] Total swap = 0kB
[335594.340000] 32768 pages RAM
[335594.340000] 0 pages HighMem/MovableOnly
[335594.340000] 1155 pages reserved
[335594.560000] mqtt_client: page allocation failure: order:0, mode:0x120
[335594.560000] CPU: 0 PID: 1640 Comm: mqtt_client Not tainted 3.18.29 #36
[335594.560000] Stack : 00000000 00000000 00000000 00000000 803541f2 0000003a 00000000 00000000
00000000 00000000 802b1cd4 8030a9e3 00000668 80353420 861cda80 00000000
00000000 00000000 8030a64c 80047628 00000006 800243ec 00000000 00000000
802b51d8 86bc7abc 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
…
[335594.560000] Call Trace:
[335594.560000] [<800141a8>] show_stack+0x50/0x84
[335594.560000] [<8006f9d8>] warn_alloc_failed+0xe8/0x10c
[335594.560000] [<800718c8>] __alloc_pages_nodemask+0x51c/0x68c
[335594.560000] [<801d5ae8>] __netdev_alloc_frag+0x78/0x1c8
[335594.560000] [<801c01c0>] fe_poll+0x2ec/0x5f0
[335594.560000] [<801e4c18>] net_rx_action+0x10c/0x1e0
[335594.560000] [<800269f8>] __do_softirq+0xf8/0x230
[335594.560000] [<80026d64>] irq_exit+0x54/0x70
[335594.560000] [<80004830>] ret_from_irq+0x0/0x4
[335594.560000] [<86889118>] 0x86889118
[335594.560000]
[335594.560000] Mem-Info:
[335594.560000] Normal per-cpu:
[335594.560000] CPU 0: hi: 42, btch: 7 usd: 43
[335594.560000] active_anon:648 inactive_anon:12 isolated_anon:0
[335594.560000] active_file:2208 inactive_file:1969 isolated_file:0
[335594.560000] unevictable:0 dirty:0 writeback:0 unstable:0
[335594.560000] free:132 slab_reclaimable:417 slab_unreclaimable:23834
[335594.560000] mapped:1049 shmem:26 pagetables:78 bounce:0
[335594.560000] free_cma:0
[335594.560000] Normal free:528kB min:1420kB low:1772kB high:2128kB active_anon:2592kB inactive_anon:48kB active_file:8832kB inactive_file:7876kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:126452kB mlocked:0kB dirty:0kB writeback:0kB mapped:4196kB shmem:104kB slab_reclaimable:1668kB slab_unreclaimable:95336kB kernel_stack:368kB pagetables:312kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[335594.560000] lowmem_reserve[]: 0 0
[335594.560000] Normal: 04kB 08kB 116kB ® 032kB 064kB 2128kB ® 1256kB ® 0512kB 01024kB 02048kB 04096kB = 528kB
[335594.560000] 4203 total pagecache pages
[335594.560000] 0 pages in swap cache
[335594.560000] Swap cache stats: add 0, delete 0, find 0/0
[335594.560000] Free swap = 0kB
[335594.560000] Total swap = 0kB
[335594.560000] 32768 pages RAM
[335594.560000] 0 pages HighMem/MovableOnly
[335594.560000] 1155 pages reserved
[335594.790000] mqtt_client: page allocation failure: order:0, mode:0x120
[335594.790000] CPU: 0 PID: 1640 Comm: mqtt_client Not tainted 3.18.29 #36
[335594.790000] Stack : 00000000 00000000 00000000 00000000 803541f2 0000003a 00000000 00000000
00000000 00000000 802b1cd4 8030a9e3 00000668 80353420 861cda80 00000000
00000000 00000000 8030a64c 80047628 00000006 800243ec 00000000 00000000
802b51d8 86bc7abc 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
…
[335594.790000] Call Trace:
[335594.790000] [<800141a8>] show_stack+0x50/0x84
[335594.790000] [<8006f9d8>] warn_alloc_failed+0xe8/0x10c
[335594.790000] [<800718c8>] __alloc_pages_nodemask+0x51c/0x68c
[335594.790000] [<801d5ae8>] __netdev_alloc_frag+0x78/0x1c8
[335594.790000] [<801c01c0>] fe_poll+0x2ec/0x5f0
[335594.790000] [<801e4c18>] net_rx_action+0x10c/0x1e0
[335594.790000] [<800269f8>] __do_softirq+0xf8/0x230
[335594.790000] [<80026d64>] irq_exit+0x54/0x70
[335594.790000] [<80004830>] ret_from_irq+0x0/0x4
[335594.790000] [<86889118>] 0x86889118
[335594.790000]
[335594.790000] Mem-Info:
[335594.790000] Normal per-cpu:
[335594.790000] CPU 0: hi: 42, btch: 7 usd: 43
[335594.790000] active_anon:648 inactive_anon:12 isolated_anon:0
[335594.790000] active_file:2208 inactive_file:1969 isolated_file:0
[335594.790000] unevictable:0 dirty:0 writeback:0 unstable:0
[335594.790000] free:132 slab_reclaimable:417 slab_unreclaimable:23834
[335594.790000] mapped:1049 shmem:26 pagetables:78 bounce:0
[335594.790000] free_cma:0
[335594.790000] Normal free:528kB min:1420kB low:1772kB high:2128kB active_anon:2592kB inactive_anon:48kB active_file:8832kB inactive_file:7876kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:126452kB mlocked:0kB dirty:0kB writeback:0kB mapped:4196kB shmem:104kB slab_reclaimable:1668kB slab_unreclaimable:95336kB kernel_stack:368kB pagetables:312kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[335594.790000] lowmem_reserve[]: 0 0
[335594.790000] Normal: 04kB 08kB 116kB ® 032kB 064kB 2128kB ® 1256kB ® 0512kB 01024kB 02048kB 0*4096kB = 528kB
[335594.790000] 4203 total pagecache pages
[335594.790000] 0 pages in swap cache
[335594.790000] Swap cache stats: add 0, delete 0, find 0/0
[335594.790000] Free swap = 0kB
[335594.790000] Total swap = 0kB
[335594.790000] 32768 pages RAM
[335594.790000] 0 pages HighMem/MovableOnly
[335594.790000] 1155 pages reserved
[335595.020000] mqtt_client: page allocation failure: order:0, mode:0x120
[335595.020000] CPU: 0 PID: 1640 Comm: mqtt_client Not tainted 3.18.29 #36
[335595.020000] Stack : 00000000 00000000 00000000 00000000 803541f2 0000003a 00000000 00000000
00000000 00000000 802b1cd4 8030a9e3 00000668 80353420 861cda80 00000000
00000000 00000000 8030a64c 80047628 00000006 800243ec 00000000 00000000
802b51d8 86bc7abc 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
…
[335595.020000] Call Trace:
[335595.020000] [<800141a8>] show_stack+0x50/0x84
[335595.020000] [<8006f9d8>] warn_alloc_failed+0xe8/0x10c
[335595.020000] [<800718c8>] __alloc_pages_nodemask+
都是打印一些重复信息，打印得很快，又不是重启信息。