tinydrm: page allocation failure

[Noralf Trønnes]

Den 11.12.2017 04.28, skrev David Lechner:
> I'm using drm-misc/drm-misc-next and occasionally getting errors as 
> seen in the stack traces below. I'm not really sure what to make of 
> it. Any ideas?
>

The spi controller driver has told the spi core to allocate dummy
buffers for tx/rx: spi_sync -> __spi_pump_messages -> spi_map_msg
-> krealloc -> __do_krealloc -> kmalloc_track_caller

order:4 means it's trying to allocate 2^4*PAGE_SIZE = 64kB, which
probably is the max DMA limit. So this is a pixel data transfer.

On my Raspberry Pi I've got 43 chunks of 64kB available if I have
understood this right:

$ sudo cat /proc/buddyinfo
Node 0, zone   Normal     40     68     66     51     43     46 13      
1      3      3     75

I don't know what those dummy buffers are used for.

Noralf.

>
> [ 1727.253743] kworker/0:2: page allocation failure: order:4, 
> mode:0x14040c1(GFP_KERNEL|GFP_DMA|__GFP_COMP), nodemask=(null)
> [ 1727.298438] CPU: 0 PID: 1913 Comm: kworker/0:2 Tainted: P 
> 4.15.0-rc2-08575-gbc02198-dirty #612
> [ 1727.331513] Hardware name: Generic DA850/OMAP-L138/AM18x
> [ 1727.354135] Workqueue: events drm_fb_helper_dirty_work 
> [drm_kms_helper]
> [ 1727.379355] Backtrace:
> [ 1727.380665] [<c000da6c>] (dump_backtrace) from [<c000dd34>] 
> (show_stack+0x18/0x1c)
> [ 1727.423509]  r7:00000040 r6:c0521840 r5:ffffe000 r4:00000000
> [ 1727.434302] [<c000dd1c>] (show_stack) from [<c04631f0>] 
> (dump_stack+0x20/0x28)
> [ 1727.468647] [<c04631d0>] (dump_stack) from [<c009ce14>] 
> (warn_alloc+0x94/0x13c)
> [ 1727.481443] [<c009cd84>] (warn_alloc) from [<c009d834>] 
> (__alloc_pages_nodemask+0x8d0/0xbd4)
> [ 1727.514315]  r3:00000004 r2:c0521840
> [ 1727.524305]  r6:00000023 r5:00000000 r4:c05c915c
> [ 1727.530599] [<c009cf64>] (__alloc_pages_nodemask) from [<c00b5d84>] 
> (kmalloc_order+0x20/0x54)
> [ 1727.554296]  r10:00000000 r9:60000013 r8:c02f0e98 r7:014000c1 
> r6:c2ae9d94 r5:0000a000
> [ 1727.575312]  r4:00000000
> [ 1727.587963] [<c00b5d64>] (kmalloc_order) from [<c00d6a3c>] 
> (__kmalloc_track_caller+0x180/0x1a4)
> [ 1727.624311] [<c00d68bc>] (__kmalloc_track_caller) from [<c00b6094>] 
> (krealloc+0x7c/0xc0)
> [ 1727.654324]  r10:00000000 r9:60000013 r8:c02f0e98 r7:014000c1 
> r6:c2ae9d94 r5:0000a000
> [ 1727.668407]  r4:00000000
> [ 1727.669779] [<c00b6018>] (krealloc) from [<c02f0e98>] 
> (__spi_pump_messages+0x4bc/0x584)
> [ 1727.704329]  r9:60000013 r8:c02ef590 r7:00000000 r6:c2ae9d94 
> r5:c2b50c00 r4:0000a000
> [ 1727.710940] [<c02f09dc>] (__spi_pump_messages) from [<c02f1fc0>] 
> (__spi_sync+0x250/0x284)
> [ 1727.744313]  r10:00000000 r9:60000013 r8:c02ef590 r7:c2b50c00 
> r6:c2ae9d94 r5:c2b50400
> [ 1727.751125]  r4:60000013
> [ 1727.752479] [<c02f1d70>] (__spi_sync) from [<c02f2020>] 
> (spi_sync+0x2c/0x44)
> [ 1727.781959]  r9:00000000 r8:c305a000 r7:c2b50400 r6:c2ae9d94 
> r5:c2ae9d94 r4:c2b50400
> [ 1727.814395] [<c02f1ff4>] (spi_sync) from [<bf2a1170>] 
> (tinydrm_spi_transfer+0x118/0x1b8 [tinydrm])
> [ 1727.822355]  r5:7ffffffc r4:00000000
> [ 1727.840616] [<bf2a1058>] (tinydrm_spi_transfer [tinydrm]) from 
> [<bf2b33ec>] (mipi_dbi_typec3_command+0x114/0x1cc [mipi_dbi])
> [ 1727.874285]  r10:c05e67e4 r9:00000000 r8:00000010 r7:c2b50400 
> r6:c3050000 r5:c2bd6010
> [ 1727.881098]  r4:0000a000
> [ 1727.882486] [<bf2b32d8>] (mipi_dbi_typec3_command [mipi_dbi]) from 
> [<bf2b2074>] (mipi_dbi_command_buf+0x40/0x54 [mipi_dbi])
> [ 1727.924298]  r8:0000a000 r7:c3050000 r6:bf2b32d8 r5:c2bd65c0 
> r4:c2bd6010
> [ 1727.929891] [<bf2b2034>] (mipi_dbi_command_buf [mipi_dbi]) from 
> [<bf2b2668>] (mipi_dbi_fb_dirty+0x18c/0x218 [mipi_dbi])
> [ 1727.964291]  r9:00000000 r8:c3050000 r7:00000001 r6:c1f7f600 
> r5:c2bd65a0 r4:c2bd6010
> [ 1727.971220] [<bf2b24dc>] (mipi_dbi_fb_dirty [mipi_dbi]) from 
> [<bf265758>] (drm_fb_helper_dirty_work+0xc8/0xe4 [drm_kms_helper])
> [ 1728.004256]  r9:00000000 r8:c05e67e4 r7:c2f5d200 r6:00000000 
> r5:60000013 r4:bf2b24dc
> [ 1728.011371] [<bf265690>] (drm_fb_helper_dirty_work 
> [drm_kms_helper]) from [<c0032504>] (process_one_work+0x140/0x454)
> [ 1728.054256]  r5:c1f6de40 r4:c1e861f4
> [ 1728.056676] [<c00323c4>] (process_one_work) from [<c0032858>] 
> (worker_thread+0x40/0x64c)
> [ 1728.063570]  r10:c05e67e4 r9:c2ae8000 r8:00000008 r7:c05f7220 
> r6:c05e67f8 r5:c1f6de58
> [ 1728.090392]  r4:c1f6de40
> [ 1728.097104] [<c0032818>] (worker_thread) from [<c00383cc>] 
> (kthread+0x108/0x148)
> [ 1728.103522]  r10:c1ced258 r9:c283bea4 r8:c1f6de40 r7:c2ae8000 
> r6:00000000 r5:c058da00
> [ 1728.144241]  r4:c1ced240
> [ 1728.145601] [<c00382c4>] (kthread) from [<c000a760>] 
> (ret_from_fork+0x14/0x34)
> [ 1728.152331]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 
> r6:00000000 r5:c00382c4
> [ 1728.182111]  r4:c058da00
> [ 1728.183397] Mem-Info:
> [ 1728.184877] active_anon:2927 inactive_anon:204 isolated_anon:0
>                 active_file:2033 inactive_file:1830 isolated_file:0
>                 unevictable:0 dirty:107 writeback:0 unstable:0
>                 slab_reclaimable:996 slab_unreclaimable:1441
>                 mapped:3107 shmem:320 pagetables:149 bounce:0
>                 free:4279 free_pcp:0 free_cma:3098
> [ 1728.254307] Node 0 active_anon:11732kB inactive_anon:792kB 
> active_file:8188kB inactive_file:7376kB unevictable:0kB 
> isolated(anon):0kB isolated(file):0kB mapped:12512kB dirty:456kB 
> writeback:0kB shmem:1280kB writeback_tmp:0kB unstable:0kB 
> all_unreclaimable? no
> [ 1728.304296] DMA free:16988kB min:820kB low:1024kB high:1228kB 
> active_anon:11748kB inactive_anon:776kB active_file:8192kB 
> inactive_file:7428kB unevictable:0kB writepending:464kB 
> present:65536kB managed:58704kB mlocked:0kB kernel_stack:488kB 
> pagetables:596kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:12392kB
> [ 1728.364196] lowmem_reserve[]: 0 0 0
> [ 1728.366509] DMA: 527*4kB (UMEHC) 412*8kB (UMEHC) 196*16kB (UMEHC) 
> 106*32kB (UMEHC) 43*64kB (UEC) 14*128kB (UC) 2*256kB (C) 0*512kB 
> 0*1024kB 0*2048kB 0*4096kB = 16988kB
> [ 1728.404211] 4225 total pagecache pages
> [ 1728.406722] 16384 pages RAM
> [ 1728.408239] 0 pages HighMem/MovableOnly
> [ 1728.410796] 1708 pages reserved
> [ 1728.412654] 4096 pages cma reserved
> [ 1728.437308] st7735r spi1.0: Failed to update display -12
> [ 1737.138417] kworker/0:2: page allocation failure: order:4, 
> mode:0x14040c1(GFP_KERNEL|GFP_DMA|__GFP_COMP), nodemask=(null)
> [ 1737.159532] CPU: 0 PID: 1913 Comm: kworker/0:2 Tainted: P 
> 4.15.0-rc2-08575-gbc02198-dirty #612
> [ 1737.171194] Hardware name: Generic DA850/OMAP-L138/AM18x
> [ 1737.176610] Workqueue: events drm_fb_helper_dirty_work 
> [drm_kms_helper]
> [ 1737.182601] Backtrace:
> [ 1737.184259] [<c000da6c>] (dump_backtrace) from [<c000dd34>] 
> (show_stack+0x18/0x1c)
> [ 1737.194828]  r7:00000040 r6:c0521840 r5:ffffe000 r4:00000000
> [ 1737.200031] [<c000dd1c>] (show_stack) from [<c04631f0>] 
> (dump_stack+0x20/0x28)
> [ 1737.208030] [<c04631d0>] (dump_stack) from [<c009ce14>] 
> (warn_alloc+0x94/0x13c)
> [ 1737.216805] [<c009cd84>] (warn_alloc) from [<c009d834>] 
> (__alloc_pages_nodemask+0x8d0/0xbd4)
> [ 1737.224964]  r3:00000004 r2:c0521840
> [ 1737.230560]  r6:00000021 r5:00000000 r4:c05c915c
> [ 1737.234807] [<c009cf64>] (__alloc_pages_nodemask) from [<c00b5d84>] 
> (kmalloc_order+0x20/0x54)
> [ 1737.245280]  r10:00000000 r9:60000013 r8:c02f0e98 r7:014000c1 
> r6:c2ae9d94 r5:0000a000
> [ 1737.252513]  r4:00000000
> [ 1737.254103] [<c00b5d64>] (kmalloc_order) from [<c00d6a3c>] 
> (__kmalloc_track_caller+0x180/0x1a4)
> [ 1737.272789] [<c00d68bc>] (__kmalloc_track_caller) from [<c00b6094>] 
> (krealloc+0x7c/0xc0)
> [ 1737.281922]  r10:00000000 r9:60000013 r8:c02f0e98 r7:014000c1 
> r6:c2ae9d94 r5:0000a000
> [ 1737.290161]  r4:00000000
> [ 1737.296344] [<c00b6018>] (krealloc) from [<c02f0e98>] 
> (__spi_pump_messages+0x4bc/0x584)
> [ 1737.305276]  r9:60000013 r8:c02ef590 r7:00000000 r6:c2ae9d94 
> r5:c2b50c00 r4:0000a000
> [ 1737.312438] [<c02f09dc>] (__spi_pump_messages) from [<c02f1fc0>] 
> (__spi_sync+0x250/0x284)
> [ 1737.322216]  r10:00000000 r9:60000013 r8:c02ef590 r7:c2b50c00 
> r6:c2ae9d94 r5:c2b50400
> [ 1737.333626]  r4:60000013
> [ 1737.335001] [<c02f1d70>] (__spi_sync) from [<c02f2020>] 
> (spi_sync+0x2c/0x44)
> [ 1737.340842]  r9:00000000 r8:c305a000 r7:c2b50400 r6:c2ae9d94 
> r5:c2ae9d94 r4:c2b50400
> [ 1737.349354] [<c02f1ff4>] (spi_sync) from [<bf2a1170>] 
> (tinydrm_spi_transfer+0x118/0x1b8 [tinydrm])
> [ 1737.363624]  r5:7ffffffc r4:00000000
> [ 1737.366094] [<bf2a1058>] (tinydrm_spi_transfer [tinydrm]) from 
> [<bf2b33ec>] (mipi_dbi_typec3_command+0x114/0x1cc [mipi_dbi])
> [ 1737.392253]  r10:c05e67e4 r9:00000000 r8:00000010 r7:c2b50400 
> r6:c3050000 r5:c2bd6010
> [ 1737.403576]  r4:0000a000
> [ 1737.405642] [<bf2b32d8>] (mipi_dbi_typec3_command [mipi_dbi]) from 
> [<bf2b2074>] (mipi_dbi_command_buf+0x40/0x54 [mipi_dbi])
> [ 1737.416696]  r8:0000a000 r7:c3050000 r6:bf2b32d8 r5:c2bd65c0 
> r4:c2bd6010
> [ 1737.427416] [<bf2b2034>] (mipi_dbi_command_buf [mipi_dbi]) from 
> [<bf2b2668>] (mipi_dbi_fb_dirty+0x18c/0x218 [mipi_dbi])
> [ 1737.438798]  r9:00000000 r8:c3050000 r7:00000001 r6:c1f7f600 
> r5:c2bd65a0 r4:c2bd6010
> [ 1737.446789] [<bf2b24dc>] (mipi_dbi_fb_dirty [mipi_dbi]) from 
> [<bf265758>] (drm_fb_helper_dirty_work+0xc8/0xe4 [drm_kms_helper])
> [ 1737.463800]  r9:00000000 r8:c05e67e4 r7:c2f5d200 r6:00000000 
> r5:60000013 r4:bf2b24dc
> [ 1737.470718] [<bf265690>] (drm_fb_helper_dirty_work 
> [drm_kms_helper]) from [<c0032504>] (process_one_work+0x140/0x454)
> [ 1737.486679]  r5:c1f6de40 r4:c1e861f4
> [ 1737.489820] [<c00323c4>] (process_one_work) from [<c0032858>] 
> (worker_thread+0x40/0x64c)
> [ 1737.507452]  r10:c05e67e4 r9:c2ae8000 r8:00000008 r7:c05f7220 
> r6:c05e67f8 r5:c1f6de58
> [ 1737.523644]  r4:c1f6de40
> [ 1737.525018] [<c0032818>] (worker_thread) from [<c00383cc>] 
> (kthread+0x108/0x148)
> [ 1737.531212]  r10:c1ced258 r9:c283bea4 r8:c1f6de40 r7:c2ae8000 
> r6:00000000 r5:c058da00
> [ 1737.554995]  r4:c1ced240
> [ 1737.563744] [<c00382c4>] (kthread) from [<c000a760>] 
> (ret_from_fork+0x14/0x34)
> [ 1737.569786]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 
> r6:00000000 r5:c00382c4
> [ 1737.585266]  r4:c058da00
> [ 1737.586555] Mem-Info:
> [ 1737.587627] active_anon:3212 inactive_anon:30 isolated_anon:0
>                 active_file:1829 inactive_file:1706 isolated_file:0
>                 unevictable:0 dirty:126 writeback:0 unstable:0
>                 slab_reclaimable:1000 slab_unreclaimable:1430
>                 mapped:2734 shmem:321 pagetables:154 bounce:0
>                 free:4503 free_pcp:0 free_cma:3162
> [ 1737.615567] Node 0 active_anon:12848kB inactive_anon:120kB 
> active_file:7372kB inactive_file:6824kB unevictable:0kB 
> isolated(anon):0kB isolated(file):0kB mapped:10936kB dirty:504kB 
> writeback:0kB shmem:1284kB writeback_tmp:0kB unstable:0kB 
> all_unreclaimable? no
> [ 1737.645083] DMA free:17984kB min:820kB low:1024kB high:1228kB 
> active_anon:12848kB inactive_anon:120kB active_file:7360kB 
> inactive_file:6792kB unevictable:0kB writepending:508kB 
> present:65536kB managed:58704kB mlocked:0kB kernel_stack:496kB 
> pagetables:616kB bounce:0kB free_pcp:20kB local_pcp:20kB free_cma:12648kB
> [ 1737.674601] lowmem_reserve[]: 0 0 0
> [ 1737.676914] DMA: 589*4kB (UMEHC) 358*8kB (UMHC) 225*16kB (UMHC) 
> 123*32kB (UMEHC) 45*64kB (UEC) 14*128kB (UC) 2*256kB (C) 0*512kB 
> 0*1024kB 0*2048kB 0*4096kB = 17940kB
> [ 1737.701573] 3883 total pagecache pages
> [ 1737.704671] 16384 pages RAM
> [ 1737.706592] 0 pages HighMem/MovableOnly
> [ 1737.709186] 1708 pages reserved
> [ 1737.711055] 4096 pages cma reserved
> [ 1742.177435] kworker/0:2: page allocation failure: order:4, 
> mode:0x14040c1(GFP_KERNEL|GFP_DMA|__GFP_COMP), nodemask=(null)
> [ 1742.213617] CPU: 0 PID: 1913 Comm: kworker/0:2 Tainted: P 
> 4.15.0-rc2-08575-gbc02198-dirty #612
> [ 1742.231618] Hardware name: Generic DA850/OMAP-L138/AM18x
> [ 1742.237868] Workqueue: events drm_fb_helper_dirty_work 
> [drm_kms_helper]
> [ 1742.245854] Backtrace:
> [ 1742.248000] [<c000da6c>] (dump_backtrace) from [<c000dd34>] 
> (show_stack+0x18/0x1c)
> [ 1742.256895]  r7:00000040 r6:c0521840 r5:ffffe000 r4:00000000
> [ 1742.262244] [<c000dd1c>] (show_stack) from [<c04631f0>] 
> (dump_stack+0x20/0x28)
> [ 1742.269239] [<c04631d0>] (dump_stack) from [<c009ce14>] 
> (warn_alloc+0x94/0x13c)
> [ 1742.277081] [<c009cd84>] (warn_alloc) from [<c009d834>] 
> (__alloc_pages_nodemask+0x8d0/0xbd4)
> [ 1742.287239]  r3:00000004 r2:c0521840
> [ 1742.290457]  r6:00000022 r5:00000000 r4:c05c915c
> [ 1742.294861] [<c009cf64>] (__alloc_pages_nodemask) from [<c00b5d84>] 
> (kmalloc_order+0x20/0x54)
> [ 1742.311390]  r10:00000000 r9:60000013 r8:c02f0e98 r7:014000c1 
> r6:c2ae9d94 r5:0000a000
> [ 1742.319808]  r4:00000000
> [ 1742.322683] [<c00b5d64>] (kmalloc_order) from [<c00d6a3c>] 
> (__kmalloc_track_caller+0x180/0x1a4)
> [ 1742.331975] [<c00d68bc>] (__kmalloc_track_caller) from [<c00b6094>] 
> (krealloc+0x7c/0xc0)
> [ 1742.341748]  r10:00000000 r9:60000013 r8:c02f0e98 r7:014000c1 
> r6:c2ae9d94 r5:0000a000
> [ 1742.350902]  r4:00000000
> [ 1742.354117] [<c00b6018>] (krealloc) from [<c02f0e98>] 
> (__spi_pump_messages+0x4bc/0x584)
> [ 1742.362572]  r9:60000013 r8:c02ef590 r7:00000000 r6:c2ae9d94 
> r5:c2b50c00 r4:0000a000
> [ 1742.370122] [<c02f09dc>] (__spi_pump_messages) from [<c02f1fc0>] 
> (__spi_sync+0x250/0x284)
> [ 1742.379851]  r10:00000000 r9:60000013 r8:c02ef590 r7:c2b50c00 
> r6:c2ae9d94 r5:c2b50400
> [ 1742.388300]  r4:60000013
> [ 1742.392540] [<c02f1d70>] (__spi_sync) from [<c02f2020>] 
> (spi_sync+0x2c/0x44)
> [ 1742.400902]  r9:00000000 r8:c305a000 r7:c2b50400 r6:c2ae9d94 
> r5:c2ae9d94 r4:c2b50400
> [ 1742.408553] [<c02f1ff4>] (spi_sync) from [<bf2a1170>] 
> (tinydrm_spi_transfer+0x118/0x1b8 [tinydrm])
> [ 1742.418971]  r5:7ffffffc r4:00000000
> [ 1742.422301] [<bf2a1058>] (tinydrm_spi_transfer [tinydrm]) from 
> [<bf2b33ec>] (mipi_dbi_typec3_command+0x114/0x1cc [mipi_dbi])
> [ 1742.435020]  r10:c05e67e4 r9:00000000 r8:00000010 r7:c2b50400 
> r6:c3050000 r5:c2bd6010
> [ 1742.443874]  r4:0000a000
> [ 1742.446156] [<bf2b32d8>] (mipi_dbi_typec3_command [mipi_dbi]) from 
> [<bf2b2074>] (mipi_dbi_command_buf+0x40/0x54 [mipi_dbi])
> [ 1742.458093]  r8:0000a000 r7:c3050000 r6:bf2b32d8 r5:c2bd65c0 
> r4:c2bd6010
> [ 1742.464897] [<bf2b2034>] (mipi_dbi_command_buf [mipi_dbi]) from 
> [<bf2b2668>] (mipi_dbi_fb_dirty+0x18c/0x218 [mipi_dbi])
> [ 1742.476362]  r9:00000000 r8:c3050000 r7:00000001 r6:c1f7f600 
> r5:c2bd65a0 r4:c2bd6010
> [ 1742.484232] [<bf2b24dc>] (mipi_dbi_fb_dirty [mipi_dbi]) from 
> [<bf265758>] (drm_fb_helper_dirty_work+0xc8/0xe4 [drm_kms_helper])
> [ 1742.497323]  r9:00000000 r8:c05e67e4 r7:c2f5d200 r6:00000000 
> r5:60000013 r4:bf2b24dc
> [ 1742.505287] [<bf265690>] (drm_fb_helper_dirty_work 
> [drm_kms_helper]) from [<c0032504>] (process_one_work+0x140/0x454)
> [ 1742.514945]  r5:c1f6de40 r4:c1e861f4
> [ 1742.517333] [<c00323c4>] (process_one_work) from [<c0032858>] 
> (worker_thread+0x40/0x64c)
> [ 1742.524410]  r10:c05e67e4 r9:c2ae8000 r8:00000008 r7:c05f7220 
> r6:c05e67f8 r5:c1f6de58
> [ 1742.531014]  r4:c1f6de40
> [ 1742.532332] [<c0032818>] (worker_thread) from [<c00383cc>] 
> (kthread+0x108/0x148)
> [ 1742.538869]  r10:c1ced258 r9:c283bea4 r8:c1f6de40 r7:c2ae8000 
> r6:00000000 r5:c058da00
> [ 1742.545653]  r4:c1ced240
> [ 1742.546985] [<c00382c4>] (kthread) from [<c000a760>] 
> (ret_from_fork+0x14/0x34)
> [ 1742.553796]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 
> r6:00000000 r5:c00382c4
> [ 1742.560411]  r4:c058da00
> [ 1742.561674] Mem-Info:
> [ 1742.562739] active_anon:3212 inactive_anon:30 isolated_anon:0
>                 active_file:1891 inactive_file:1541 isolated_file:0
>                 unevictable:0 dirty:0 writeback:61 unstable:0
>                 slab_reclaimable:1000 slab_unreclaimable:1476
>                 mapped:2123 shmem:321 pagetables:154 bounce:0
>                 free:4556 free_pcp:5 free_cma:3162
> [ 1742.588213] Node 0 active_anon:12848kB inactive_anon:120kB 
> active_file:7564kB inactive_file:6164kB unevictable:0kB 
> isolated(anon):0kB isolated(file):0kB mapped:8492kB dirty:0kB 
> writeback:244kB shmem:1284kB writeback_tmp:0kB unstable:0kB 
> all_unreclaimable? no
> [ 1742.610916] DMA free:18224kB min:820kB low:1024kB high:1228kB 
> active_anon:12848kB inactive_anon:120kB active_file:7564kB 
> inactive_file:6164kB unevictable:0kB writepending:244kB 
> present:65536kB managed:58704kB mlocked:0kB kernel_stack:496kB 
> pagetables:616kB bounce:0kB free_pcp:20kB local_pcp:20kB free_cma:12648kB
> [ 1742.638628] lowmem_reserve[]: 0 0 0
> [ 1742.640936] DMA: 676*4kB (UMEHC) 294*8kB (UMHC) 261*16kB (UMHC) 
> 117*32kB (UMEHC) 46*64kB (UMEC) 14*128kB (UC) 2*256kB (C) 0*512kB 
> 0*1024kB 0*2048kB 0*4096kB = 18224kB
> [ 1742.655056] 3753 total pagecache pages
> [ 1742.657553] 16384 pages RAM
> [ 1742.659927] 0 pages HighMem/MovableOnly
> [ 1742.664521] 1708 pages reserved
> [ 1742.667263] 4096 pages cma reserved