Chúng tôi có bảng tùy chỉnh dựa trên BBB và nó có RAM 256 MB và 4GB eMMC, chúng tôi đang thấy vấn đề phân mảnh trên đó.
Và như một phần của phân tích tôi muốn hiểu, bộ đệm unmovable( from /proc/pagetypeinfo)và unevictable(from /proc/zoneinfo)trang trong bộ đệm (hay bộ đệm) là gì?
# cat /proc/pagetypeinfo ; cat /proc/buddyinfo
Page block order: 11
Pages per block: 2048
Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 11
Node 0, zone Normal, type Unmovable 291 254 213 171 146 98 68 41 23 16 6 0
Node 0, zone Normal, type Reclaimable 0 0 2 2 1 0 1 1 1 1 1 0
Node 0, zone Normal, type Movable 32 19 5 8 4 4 3 1 1 0 1 0
Node 0, zone Normal, type Reserve 30 31 22 20 23 14 7 3 0 0 0 0
Node 0, zone Normal, type CMA 507 252 112 16 1 1 0 0 0 0 0 0
Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0 0
Number of blocks type Unmovable Reclaimable Movable Reserve CMA Isolate
Node 0, zone Normal 20 1 8 1 2 0
Node 0, zone Normal 860 556 354 217 175 117 79 46 25 17 8 0
đầu ra df như sau
Filesystem 1024-blocks Used Available Use% Mounted on
rootfs 487652 136737 321219 30% /
/dev/root 487652 136737 321219 30% /
tmpfs 125720 60 125660 0% /tmp
tmpfs 125720 0 125720 0% /dev/shm
tmpfs 125720 68 125652 0% /var/run
tmpfs 125720 8 125712 0% /var/spool/cron
tmpfs 125720 4 125716 0% /home/<app>/.ssh
tmpfs 125720 0 125720 0% /var/sftp
tmpfs 125720 0 125720 0% /var/monit-health-check
/dev/mmcblk0p18 55397 3480 47617 7% /var/db
/dev/mmcblk0p19 999320 1416 929092 0% /var/firmware
/dev/mmcblk0p20 379525 2094 353316 1% /var/misc
/dev/mmcblk0p21 31596 1065 27951 4% /var/log
/dev/mmcblk0p22 999320 1284 929224 0% /var/eventlog
không ramfscó chỉ có tmpfsvậy tại sao ~38MBcác trang không thể di chuyển được hiện diện? Có điều gì bất thường không?
Chúng tôi đã CONFIG_COMPACTIONkích hoạt trong cấu hình kernel. Điều đó là khi chúng ta thấy
Vấn đề phân mảnh đã được hỏi trong các nhóm google dựa trên BBB, Chúng tôi chưa có giải pháp. https://groups.google.com/forum/#!topic/beagleboard/L7piqfHiyO8
Ca sử dụng : Tạo tar chứa các tệp Kích thước 4k (sử dụng / dev / urandom) (85,0000) và giải nén nó trên phân vùng được gắn (kích thước 500MB, FS = ext4), sau một thời gian, chúng tôi hủy kết nối dừng và phân vùng được hiển thị lại dưới dạng chỉ đọc.
[47364.483783] lowmem_reserve[]: 0 0 0
[47364.483797] Normal: 2529*4kB (UEMRC) 893*8kB (UEMC) 16*16kB (UM) 6*32kB (M) 0*64kB 1*128kB (M) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB = 17836kB
[47364.483855] 44590 total pagecache pages
[47364.483871] 0 pages in swap cache
[47364.483881] Swap cache stats: add 0, delete 0, find 0/0
[47364.483888] Free swap = 0kB
[47364.483895] Total swap = 0kB
[47364.494968] 65536 pages of RAM
[47364.494978] 4767 free pages
[47364.494985] 2662 reserved pages
[47364.494993] 5200 slab pages
[47364.495000] 310103 pages shared
[47364.495008] 0 pages swap cached
[47368.503176] mmcqd/1: page allocation failure: order:2, mode:0x200020
[47368.503216] CPU: 0 PID: 613 Comm: mmcqd/1 Tainted: P O 3.12.10-005-ts-armv7l #1
[47368.503282] [<c0012d24>] (unwind_backtrace+0x0/0xf4) from [<c0011130>] (show_stack+0x10/0x14)
[47368.503317] [<c0011130>] (show_stack+0x10/0x14) from [<c0087548>] (warn_alloc_failed+0xe0/0x118)
[47368.503346] [<c0087548>] (warn_alloc_failed+0xe0/0x118) from [<c008a3ac>] (__alloc_pages_nodemask+0x74c/0x8f8)
[47368.503375] [<c008a3ac>] (__alloc_pages_nodemask+0x74c/0x8f8) from [<c00b2e8c>] (cache_alloc_refill+0x328/0x620)
[47368.503398] [<c00b2e8c>] (cache_alloc_refill+0x328/0x620) from [<c00b3224>] (__kmalloc+0xa0/0xe8)
[47368.503433] [<c00b3224>] (__kmalloc+0xa0/0xe8) from [<c0212904>] (edma_prep_slave_sg+0x84/0x388)
[47368.503469] [<c0212904>] (edma_prep_slave_sg+0x84/0x388) from [<c02eeb98>] (omap_hsmmc_request+0x414/0x508)
[47368.503497] [<c02eeb98>] (omap_hsmmc_request+0x414/0x508) from [<c02d9240>] (mmc_start_request+0xc4/0xe0)
[47368.503519] [<c02d9240>] (mmc_start_request+0xc4/0xe0) from [<c02da028>] (mmc_start_req+0x2d8/0x38c)
[47368.503540] [<c02da028>] (mmc_start_req+0x2d8/0x38c) from [<c02e7310>] (mmc_blk_issue_rw_rq+0xb4/0x9d8)
[47368.503562] [<c02e7310>] (mmc_blk_issue_rw_rq+0xb4/0x9d8) from [<c02e7dd8>] (mmc_blk_issue_rq+0x1a4/0x468)
[47368.503583] [<c02e7dd8>] (mmc_blk_issue_rq+0x1a4/0x468) from [<c02e8760>] (mmc_queue_thread+0x88/0x118)
[47368.503609] [<c02e8760>] (mmc_queue_thread+0x88/0x118) from [<c004d8b8>] (kthread+0xb4/0xb8)
[47368.503633] [<c004d8b8>] (kthread+0xb4/0xb8) from [<c000e298>] (ret_from_fork+0x14/0x3c)
[47368.503644] Mem-info:
[47368.503653] Normal per-cpu:
[47368.503664] CPU 0: hi: 90, btch: 15 usd: 17
[47368.503691] active_anon:7530 inactive_anon:20 isolated_anon:0
[47368.503691] active_file:3142 inactive_file:44610 isolated_file:0
[47368.503691] unevictable:422 dirty:32 writeback:0 unstable:0
[47368.503691] free:1149 slab_reclaimable:3734 slab_unreclaimable:1130
[47368.503691] mapped:2362 shmem:43 pagetables:256 bounce:0
[47368.503691] free_cma:207
[47368.503752] Normal free:4596kB min:2004kB low:2504kB high:3004kB active_anon:30120kB inactive_anon:80kB active_file:12568kB inactive_file:178440kB unevictable:1688kB isolated(anon):0kB isolated(file):0kB present:260096kB managed:251496kB mlocked:1688kB dirty:128kB writeback:0kB mapped:9448kB shmem:172kB slab_reclaimable:14936kB slab_unreclaimable:4520kB kernel_stack:1176kB pagetables:1024kB unstable:0kB bounce:0kB free_cma:828kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[47368.503765] lowmem_reserve[]: 0 0 0
[47368.503782] Normal: 833*4kB (UEMRC) 158*8kB (MC) 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB = 4596kB
[47368.503833] 48144 total pagecache pages
[47368.503849] 0 pages in swap cache
[47368.503858] Swap cache stats: add 0, delete 0, find 0/0
[47368.503866] Free swap = 0kB
[47368.503873] Total swap = 0kB
[47368.503885] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[47368.503896] cache: kmalloc-16384, object size: 16384, order: 2
[47368.503909] node 0: slabs: 7/7, objs: 7/7, free: 0
[47368.503932] omap_hsmmc 481d8000.mmc: prep_slave_sg() failed
[47368.503945] omap_hsmmc 481d8000.mmc: MMC start dma failure
[47368.512369] mmcblk0: unknown error -1 sending read/write command, card status 0x900
[47368.512578] blk_update_request: 371 callbacks suppressed
[47368.512591] end_request: I/O error, dev mmcblk0, sector 1371894
[47368.512613] Buffer I/O error on device mmcblk0p16, logical block 145275
[47368.512623] lost page write due to I/O error on mmcblk0p16
[47368.512892] end_request: I/O error, dev mmcblk0, sector 1371896
[47368.512906] Buffer I/O error on device mmcblk0p16, logical block 145276
[47368.512916] lost page write due to I/O error on mmcblk0p16
[47368.513011] end_request: I/O error, dev mmcblk0, sector 1371898
[47368.513024] Buffer I/O error on device mmcblk0p16, logical block 145277
[47368.513034] lost page write due to I/O error on mmcblk0p16
[47368.513107] end_request: I/O error, dev mmcblk0, sector 1371900
[47368.513179] end_request: I/O error, dev mmcblk0, sector 1371902
[47368.513251] end_request: I/O error, dev mmcblk0, sector 1371904
[47368.513322] end_request: I/O error, dev mmcblk0, sector 1371906
[47368.513405] end_request: I/O error, dev mmcblk0, sector 1371908
[47368.513478] end_request: I/O error, dev mmcblk0, sector 1371910
[47368.513549] end_request: I/O error, dev mmcblk0, sector 1371912
[47368.796212] Aborting journal on device mmcblk0p16-8.
[47368.802513] EXT4-fs error (device mmcblk0p16): ext4_journal_check_start:56: Detected aborted journal
[47368.812303] EXT4-fs (mmcblk0p16): Remounting filesystem read-only
[47369.669029] Mem-info:
[47369.669043] Normal per-cpu:
[47369.669057] CPU 0: hi: 90, btch: 15 usd: 47
[47369.669085] active_anon:7486 inactive_anon:20 isolated_anon:0
[47369.669085] active_file:3150 inactive_file:44775 isolated_file:0
[47369.669085] unevictable:422 dirty:37 writeback:0 unstable:0
[47369.669085] free:1041 slab_reclaimable:3730 slab_unreclaimable:1105
[47369.669085] mapped:2367 shmem:43 pagetables:250 bounce:0
[47369.669085] free_cma:176
[47369.669147] Normal free:4164kB min:2004kB low:2504kB high:3004kB active_anon:29944kB inactive_anon:80kB active_file:12600kB inactive_file:179100kB unevictable:1688kB isolated(anon):0kB isolated(file):0kB present:260096kB managed:251496kB mlocked:1688kB dirty:148kB writeback:0kB mapped:9468kB shmem:172kB slab_reclaimable:14920kB slab_unreclaimable:4420kB kernel_stack:1168kB pagetables:1000kB unstable:0kB bounce:0kB free_cma:704kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[47369.669159] lowmem_reserve[]: 0 0 0
[47369.669173] Normal: 733*4kB (UEMRC) 92*8kB (MC) 11*16kB (UMC) 6*32kB (UMC) 2*64kB (U) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB = 4164kB
Vấn đề tương tự không thể lặp lại trong BBB (với Linux 3.8 và angstrom). Tôi cũng đã thay đổi kích thước RAM thành 256M trong khi thử nghiệm nó.