Hi,
-I am currently working on one embedded development board.
-I have ported 3.0.31 kernel with my personal patches on it.
-When I am trying to insert my module, it fails to allocate 4MB memory using kmalloc.
-Below is a snapshot of cat /proc/meminfo command of my embedded linux system.
-According to my understanding, LowFree parameter indicates free memory in kernel space which is around 536MB in this case.
-There is a lot free space available in kernel space then
why module fails in kmalloc of 4MB ?
-Also find the attached log messages of dmesg
Regards,
Mehul
[65210.351562] Hello World [65210.356201] insmod: page allocation failure: order:10, mode:0xd0 [65210.363952] [<c007d5ac>] (unwind_backtrace+0x0/0x128) from [<c059b138>] (dump_stack+0x20/0x28) [65210.375183] [<c059b138>] (dump_stack+0x20/0x28) from [<c0107d84>] (warn_alloc_failed+0xf4/0x114) [65210.386596] [<c0107d84>] (warn_alloc_failed+0xf4/0x114) from [<c0109e6c>] (__alloc_pages_nodemask+0x588/0x684) [65210.399505] [<c0109e6c>] (__alloc_pages_nodemask+0x588/0x684) from [<c059cbf4>] (cache_alloc_refill+0x2d0/0x51c) [65210.411773] [<c059cbf4>] (cache_alloc_refill+0x2d0/0x51c) from [<c0135308>] (kmem_cache_alloc_trace+0x84/0x1ac) [65210.422851] [<c0135308>] (kmem_cache_alloc_trace+0x84/0x1ac) from [<bf165028>] (myfunc+0x28/0x48 [myModule]) [65210.433959] [<bf165028>] (myfunc+0x28/0x48 [myModule]) from [<bf165068>] (init_module+0x20/0x30 [myModule]) [65210.444976] [<bf165068>] (init_module+0x20/0x30 [myModule]) from [<c006a654>] (do_one_initcall+0xa0/0x170) [65210.455535] [<c006a654>] (do_one_initcall+0xa0/0x170) from [<c00de0a8>] (sys_init_module+0x18bc/0x1abc) [65210.466125] [<c00de0a8>] (sys_init_module+0x18bc/0x1abc) from [<c0075c80>] (ret_fast_syscall+0x0/0x30) [65210.476043] Mem-info: [65210.478393] Normal per-cpu: [65210.482269] CPU 0: hi: 186, btch: 31 usd: 38 [65210.487762] CPU 1: hi: 186, btch: 31 usd: 158 [65210.493011] HighMem per-cpu: [65210.496276] CPU 0: hi: 42, btch: 7 usd: 3 [65210.502716] CPU 1: hi: 42, btch: 7 usd: 35 [65210.508453] active_anon:8156 inactive_anon:40 isolated_anon:0 [65210.508483] active_file:6 inactive_file:135 isolated_file:0 [65210.508483] unevictable:0 dirty:6 writeback:0 unstable:0 [65210.508483] free:138461 slab_reclaimable:740 slab_unreclaimable:15319 [65210.508483] mapped:51 shmem:89 pagetables:435 bounce:25 [65210.538635] Normal free:550544kB min:3744kB low:4680kB high:5616kB active_anon:21720kB inactive_anon:144kB active_file:24kB inactive_file:84kB unevictable:0kB isolated(anons [65210.580169] lowmem_reserve[]: 0 1262 1262 [65210.584777] HighMem free:2716kB min:156kB low:328kB high:500kB active_anon:10904kB inactive_anon:16kB active_file:0kB inactive_file:940kB unevictable:0kB isolated(anon):0kBs [65210.624145] lowmem_reserve[]: 0 0 0 [65210.628082] Normal: 2495*4kB 1598*8kB 1091*16kB 1020*32kB 950*64kB 666*128kB 366*256kB 208*512kB 86*1024kB 19*2048kB 1*4096kB 0*8192kB 0*16384kB 0*32768kB 0*65536kB 0*13107B [65210.647460] HighMem: 4*4kB 80*8kB 94*16kB 6*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB 0*32768kB 0*65536kB 0*131072kB = 2352kB [65210.666870] 543 total pagecache pages [65210.671844] 0 pages in swap cache [65210.675292] Swap cache stats: add 0, delete 0, find 0/0 [65210.681457] Free swap = 0kB [65210.685424] Total swap = 0kB [65210.700500] 262144 pages of RAM [65210.704681] 171752 free pages [65210.707733] 63879 reserved pages [65210.711700] 16069 slab pages [65210.715332] 262 pages shared [65210.718383] 0 pages swap cached [65210.722229] Memory allocation failed
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