{"id":4511,"date":"2020-08-15T02:12:23","date_gmt":"2020-08-14T18:12:23","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=4511"},"modified":"2020-08-15T02:12:23","modified_gmt":"2020-08-14T18:12:23","slug":"linux%e5%86%85%e5%ad%98slab%e5%88%86%e9%85%8d%e5%99%a8%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%ef%bc%88%e4%b8%80%ef%bc%89-%e6%a6%82%e5%bf%b5","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/4511","title":{"rendered":"[Linux\u5185\u5b58]slab\u5206\u914d\u5668\u5b66\u4e60\u7b14\u8bb0\uff08\u4e00\uff09–\u6982\u5ff5"},"content":{"rendered":"
\n
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<\/div>\n
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\u539f\u6587\u5730\u5740<\/a><\/div>\n
<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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http:\/\/blog.csdn.net\/vanbreaker\/article\/details\/7664296<\/a>
\n1,\u4e3a\u4ec0\u4e48\u9700\u8981slab\u5206\u914d\u5668\uff1a<\/strong>
\n\u5229\u7528\u4f19\u4f34\u7cfb\u7edf\u8fdb\u884c\u5206\u914d\u5185\u5b58\u53ea\u80fd\u6309\u7167\u9875\u7684\u5355\u4f4d\u8fdb\u884c\u5206\u914d\uff0c\u8fd9\u6837\u4f1a\u9020\u6210\u5f88\u591a\u7684\u5185\u5b58\u6d6a\u8d39\uff0c\u591a\u4e86\u5f88\u591a\u5185\u5b58\u788e\u7247\uff0c\u6bd4\u5982\u53ea\u9700\u8981\u7533\u8bf710\u5b57\u8282\u7684\uff0c\u7ed3\u679c\u5206\u914d\u4e86\u4e00\u4e2a\u9875\u3002<\/p>\n

2\uff0cslab\u5206\u914d\u5668\u548c\u4f19\u4f34\u7cfb\u7edf\u5206\u914d\u7684\u5dee\u522b<\/strong>
\nslab\u5206\u914d\u5668\u662f\u57fa\u4e8e\u5bf9\u8c61\u8fdb\u884c\u7ba1\u7406\u7684\uff0c\u76f8\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\u5f52\u4e3a\u4e00\u7c7b(\u5982\u8fdb\u7a0b\u63cf\u8ff0\u7b26\u5c31\u662f\u4e00\u7c7b)\uff0c\u6bcf\u5f53\u8981\u7533\u8bf7\u8fd9\u6837\u4e00\u4e2a\u5bf9\u8c61\uff0cslab\u5206\u914d\u5668\u5c31\u4ece\u4e00\u4e2aslab\u5217\u8868\u4e2d\u5206\u914d\u4e00\u4e2a\u8fd9\u6837\u5927\u5c0f\u7684\u5355\u5143\u51fa\u53bb\uff0c\u800c\u5f53\u8981\u91ca\u653e\u65f6\uff0c\u5c06\u5176\u91cd\u65b0\u4fdd\u5b58\u5728\u8be5\u5217\u8868\u4e2d\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u8fd4\u56de\u7ed9\u4f19\u4f34\u7cfb\u7edf\u3002slab\u5206\u914d\u5bf9\u8c61\u65f6\uff0c\u4f1a\u4f7f\u7528\u6700\u8fd1\u91ca\u653e\u7684\u5bf9\u8c61\u5185\u5b58\u5757\uff0c\u56e0\u6b64\u5176\u9a7b\u7559\u5728CPU\u9ad8\u901f\u7f13\u5b58\u7684\u6982\u7387\u8f83\u9ad8
\nSlab\u5206\u914d\u5668\u7531\u5f88\u591a\u7f13\u5b58\uff08\u52a8\u6001\u94fe\u8868\uff09\u7ec4\u6210\uff0c\u4e0d\u540c\u7684\u7f13\u5b58\u5927\u5c0f\u4e0d\u540c\uff08\u5982\u540d\u4e3akmalloc-128\u7684\u7f13\u5b58\u6240\u7ba1\u7406\u5bf9\u8c61\u7684\u957f\u5ea6\u4e3a128\u5b57\u8282\uff09\u3002Linux\u7684Slab\u7f13\u5b58\u5206\u4e3a\u4e13\u7528\u548c\u901a\u7528\u4e24\u79cd\uff0c\u901a\u7528\u7f13\u5b58\u901a\u8fc7\u51fd\u6570kmem_cache_init()\u00a0\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u9002\u7528\u4e8e\u7279\u5b9a\u5bf9\u8c61\uff0c\u6bd4\u5982\u5404\u79cd\u63cf\u8ff0\u7b26\uff0c\u5b58\u653e\u8fdb\u7a0b\u63cf\u8ff0\u7b26\u7684\u7f13\u5b58\u5927\u5c0f\u5c31\u662fsizeof(task_struct)\uff1b\u800c\u4e13\u7528\u7f13\u5b58\u5219\u901a\u8fc7\u51fd\u6570\u00a0kmem_cache_create()\u521b\u5efa\u3002\u901a\u7528Slab\u7684\u5bf9\u8c61\u5927\u5c0f\u9884\u5148\u5b9a\u4e49\u597d\u7684\uff0c\u4e00\u822c\u662f2\u7684\u6b21\u5e42\uff08cache\u5bf9\u9f50\u7684\u9700\u8981\uff09\uff0cLinux\u4f7f\u752813\u7ea7\uff0c\u00a0\u5982\u4e0b\uff1a32\u300164\u3001128\u3001256\u3001512\u30011024\u30012048\u30014096\u30018192\u300116384\u300132768\u300165536\u3001131072\u3002\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u5185\u5b58\u788e\u7247\u5c0f\u4e8e\u767e\u5206\u4e4b50<\/p>\n

3\uff0cslab\u7684\u6982\u5ff5<\/strong><\/p>\n

slab\u5206\u914d\u5668\u628a\u5185\u5b58\u533a\u770b\u4f5c\u5bf9\u8c61\uff08object\uff09,\u8fd9\u4e9b\u5bf9\u8c61\u7531\u4e00\u7ec4\u6570\u636e\u7ed3\u6784\u548c\u51e0\u4e2a\u6784\u9020\u51fd\u6570\u6216\u8005\u6790\u6784\u51fd\u6570\u7ec4\u6210\uff0c\u5206\u522b\u7528\u4e8e\u521d\u59cb\u5316\u548c\u56de\u6536\u5185\u5b58\u3002slab\u5206\u914d\u5668\u628a\u5bf9\u8c61\u5206\u7ec4\u653e\u8fdb\u544a\u8bc9\u7f13\u5b58\uff0c\u5305\u542b\u9ad8\u901f\u7f13\u5b58\u7684\u4e3b\u5185\u5b58\u533a\u88ab\u5212\u5206\u4e3a\u591a\u4e2aslab,\u6bcf\u4e2aslab\u7531\u4e00\u4e2a\u6216\u8005\u591a\u4e2a\u8fde\u7eed\u7684\u9875\u7ec4\u6210\uff0c\u8fd9\u4e9b\u9875\u6846\u5305\u542b\u5df2\u5206\u914d\u5bf9\u8c61\u548c\u7a7a\u95f2\u5bf9\u8c61\u3002<\/p>\n

\u6bcf\u4e00\u4e2aslab\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2akmem_bufctl_t\u63cf\u8ff0\u7b26\uff0c\u6bcf\u4e2aslab\u7684\u5bf9\u8c61\u63cf\u8ff0\u7b26\u90fd\u5b58\u653e\u5728slab\u63cf\u8ff0\u7b26\u7684\u540e\u9762\u3002\u56e0\u6b64((kmem_bufctl_t*)(slab + 1)\u5c31\u6307\u5411slab\u7684kmem_bufctl_t\u63cf\u8ff0\u7b26\u5730\u5740\uff0c\u8bed\u53e5((kmem_bufctl_t*)(slab + 1)[i]\u5c31\u662f\u8bbf\u95ee\u7b2ci\u4e2a\u5bf9\u8c61\u7684\u7d22\u5f15\u3002<\/p>\n

\"\"
\n4\uff0cslab\u5206\u914d\u5668\u7528\u7684\u76f8\u5173\u6570\u636e\u7ed3\u6784
\n<\/strong>\u7528\u4e8e\u63cf\u8ff0\u548c\u7ba1\u7406cache\u7684\u6570\u636e\u7ed3\u6784\u662fstruct kmem_cache<\/p>\n

<\/code><\/pre>\n
    \n
  1. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> kmem_cache<\/span> {<\/span><\/div>\n<\/div>\n<\/li>\n
  2. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/* 1) per-cpu data, touched during every alloc\/free *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  3. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/*per-CPU\u6570\u636e\uff0c\u8bb0\u5f55\u4e86\u672c\u5730\u9ad8\u901f\u7f13\u5b58\u7684\u4fe1\u606f\uff0c\u4e5f\u7528\u4e8e\u8ddf\u8e2a\u6700\u8fd1\u91ca\u653e\u7684\u5bf9\u8c61\uff0c\u6bcf\u6b21\u5206\u914d\u548c\u91ca\u653e\u90fd\u8981\u76f4\u63a5\u8bbf\u95ee\u5b83*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  4. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> array_cache<\/span> *array<\/span>[NR_CPUS<\/span>];<\/span><\/div>\n<\/div>\n<\/li>\n
  5. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/* 2) Cache tunables. Protected by cache_chain_mutex *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  6. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> batchcount; \/*\u672c\u5730\u9ad8\u901f\u7f13\u5b58\u8f6c\u5165\u6216\u8f6c\u51fa\u7684\u5927\u6279\u5bf9\u8c61\u6570\u91cf*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  7. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> limit; \/*\u672c\u5730\u9ad8\u901f\u7f13\u5b58\u4e2d\u7a7a\u95f2\u5bf9\u8c61\u7684\u6700\u5927\u6570\u76ee*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  8. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> shared;<\/div>\n<\/div>\n<\/li>\n
  9. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  10. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> buffer_size;\/*\u7ba1\u7406\u5bf9\u8c61\u7684\u5927\u5c0f*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  11. \n
    \n
    <\/div>\n<\/div>\n
    \n
    u32 reciprocal_buffer_size;\/*buffer_size\u7684\u5012\u6570\u503c*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  12. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/* 3) touched by every alloc & free from the backend *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  13. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  14. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> flags; \/* \u9ad8\u901f\u7f13\u5b58\u7684\u6c38\u4e45\u6807\u8bc6*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  15. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> num; \/* \u4e00\u4e2aslab\u6240\u5305\u542b\u7684\u5bf9\u8c61\u6570\u76ee *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  16. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  17. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/* 4) cache_grow\/shrink *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  18. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/* order of pgs per slab (2^n) *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  19. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> gfporder; \/*\u4e00\u4e2aslab\u5305\u542b\u7684\u8fde\u7eed\u9875\u6846\u6570\u7684\u5bf9\u6570*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  20. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  21. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/* force GFP flags, e.g. GFP_DMA *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  22. \n
    \n
    <\/div>\n<\/div>\n
    \n
    gfp_t<\/span> gfpflags; \/*\u4e0e\u4f19\u4f34\u7cfb\u7edf\u4ea4\u4e92\u65f6\u6240\u63d0\u4f9b\u7684\u5206\u914d\u6807\u8bc6*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  23. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  24. \n
    \n
    <\/div>\n<\/div>\n
    \n
    size_t<\/span> colour; \/* \u989c\u8272\u7684\u4e2a\u6570*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  25. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> colour_off; \/* \u7740\u8272\u7684\u504f\u79fb\u91cf *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  26. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  27. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/*\u5982\u679c\u5c06slab\u63cf\u8ff0\u7b26\u5b58\u50a8\u5728\u5916\u90e8\uff0c\u8be5\u6307\u9488\u6307\u5411\u5b58\u50a8slab\u63cf\u8ff0\u7b26\u7684cache, <\/span><\/div>\n<\/div>\n<\/li>\n
  28. \n
    \n
    <\/div>\n<\/div>\n
    \n
     \u5426\u5219\u4e3aNULL*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  29. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> kmem_cache<\/span> *slabp_cache<\/span>;<\/span><\/div>\n<\/div>\n<\/li>\n
  30. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> slab_size; \/*slab\u7ba1\u7406\u533a\u7684\u5927\u5c0f*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  31. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> dflags; \/*\u52a8\u6001\u6807\u8bc6*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  32. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  33. \n
    \n
    <\/div>\n<\/div>\n
    \n
    void<\/span> (*ctor)(void<\/span> *obj); \/*\u521b\u5efa\u9ad8\u901f\u7f13\u5b58\u65f6\u7684\u6784\u9020\u51fd\u6570\u6307\u9488*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  34. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  35. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/* 5) cache creation\/removal *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  36. \n
    \n
    <\/div>\n<\/div>\n
    \n
    const<\/span> char<\/span> *name; \/*\u9ad8\u901f\u7f13\u5b58\u540d*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  37. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> list_head<\/span> next<\/span>;<\/span> \/*\u7528\u4e8e\u5c06\u9ad8\u901f\u7f13\u5b58\u94fe\u5165cache chain*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  38. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  39. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/* 6) statistics *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  40. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  41. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/*struct kmem_list3\u7528\u4e8e\u7ec4\u7ec7\u8be5\u9ad8\u901f\u7f13\u5b58\u4e2d\u7684slab*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  42. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> kmem_list3<\/span> *nodelists<\/span>[MAX_NUMNODES<\/span>];<\/span><\/div>\n<\/div>\n<\/li>\n
  43. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \/* <\/span><\/div>\n<\/div>\n<\/li>\n
  44. \n
    \n
    <\/div>\n<\/div>\n
    \n
     * Do not add fields after nodelists[] <\/span><\/div>\n<\/div>\n<\/li>\n
  45. \n
    \n
    <\/div>\n<\/div>\n
    \n
     *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  46. \n
    \n
    <\/div>\n<\/div>\n
    \n
    };<\/div>\n<\/div>\n<\/li>\n
  47. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  48. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> kmem_list3<\/span> {<\/span><\/div>\n<\/div>\n<\/li>\n
  49. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> list_head<\/span> slabs_partial<\/span>;<\/span>\/*slab\u94fe\u8868\uff0c\u5305\u542b\u7a7a\u95f2\u5bf9\u8c61\u548c\u5df2\u5206\u914d\u5bf9\u8c61\u7684slab\u63cf\u8ff0\u7b26*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  50. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> list_head<\/span> slabs_full<\/span>;<\/span> \/*slab\u94fe\u8868\uff0c\u53ea\u5305\u542b\u975e\u7a7a\u95f2\u7684slab\u63cf\u8ff0\u7b26*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  51. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> list_head<\/span> slabs_free<\/span>;<\/span> \/*slab\u94fe\u8868\uff0c\u53ea\u5305\u542b\u7a7a\u95f2\u7684slab\u63cf\u8ff0\u7b26*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  52. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> long<\/span> free_objects; \/*\u9ad8\u901f\u7f13\u5b58\u4e2d\u7a7a\u95f2\u5bf9\u8c61\u7684\u4e2a\u6570*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  53. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> free_limit; \/*\u7a7a\u95f2\u5bf9\u8c61\u7684\u4e0a\u9650*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  54. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> colour_next; \/*\u4e0b\u4e00\u4e2aslab\u4f7f\u7528\u7684\u989c\u8272*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  55. \n
    \n
    <\/div>\n<\/div>\n
    \n
    spinlock_t<\/span> list_lock;<\/div>\n<\/div>\n<\/li>\n
  56. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> array_cache<\/span> *shared<\/span>;<\/span> \/* shared per node *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  57. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> array_cache<\/span> **alien<\/span>;<\/span> \/* on other nodes *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  58. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> long<\/span> next_reap; \/* updated without locking *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  59. \n
    \n
    <\/div>\n<\/div>\n
    \n
    int<\/span> free_touched; \/* updated without locking *\/<\/span><\/div>\n<\/div>\n<\/li>\n
  60. \n
    \n
    <\/div>\n<\/div>\n
    \n
    };<\/div>\n<\/div>\n<\/li>\n
  61. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  62. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \u63cf\u8ff0\u548c\u7ba1\u7406\u5355\u4e2aslab\u7684\u7ed3\u6784\u662fstruct<\/span> slab<\/span><\/span><\/div>\n<\/div>\n<\/li>\n
  63. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> slab<\/span> {<\/div>\n<\/div>\n<\/li>\n
  64. \n
    \n
    <\/div>\n<\/div>\n
    \n
    struct<\/span> list_head<\/span> list<\/span>;<\/span> \/*\u7528\u4e8e\u5c06slab\u94fe\u5165kmem_list3\u7684\u94fe\u8868*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  65. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> long<\/span> colouroff;\/*\u8be5slab\u7684\u7740\u8272\u504f\u79fb*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  66. \n
    \n
    <\/div>\n<\/div>\n
    \n
    void<\/span> *s_mem; \/*\u6307\u5411slab\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5bf9\u8c61*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  67. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> int<\/span> inuse; \/*\u5df2\u5206\u914d\u51fa\u53bb\u7684\u5bf9\u8c61*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  68. \n
    \n
    <\/div>\n<\/div>\n
    \n
    kmem_bufctl_t<\/span> free<\/span>; \/*\u4e0b\u4e00\u4e2a\u7a7a\u95f2\u5bf9\u8c61\u7684\u4e0b\u6807*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  69. \n
    \n
    <\/div>\n<\/div>\n
    \n
    unsigned<\/span> short<\/span> nodeid; \/*\u8282\u70b9\u6807\u8bc6\u53f7*\/<\/span><\/div>\n<\/div>\n<\/li>\n
  70. \n
    \n
    <\/div>\n<\/div>\n
    \n
    };<\/div>\n<\/div>\n<\/li>\n<\/ol>\n
    <\/code><\/pre>\n
    \u5404\u4e2a\u6570\u636e\u7ed3\u6784\u4e4b\u95f4\u5173\u7cfb\uff1a<\/p>\n
    \"\"<\/p>\n
    slab\u63cf\u8ff0\u7b26\u53ef\u4ee5\u653e\u5728\u4ee5\u4e0b\u4e24\u4e2a\u5730\u65b9
    \n1\uff0c\u5916\u90e8slab\u63cf\u8ff0\u7b26\uff0c\u5b58\u5728\u666e\u901a\u7684\u9ad8\u901f\u7f13\u5b58
    \n2\uff0c\u5185\u90e8slab\u63cf\u8ff0\u7b26\uff0c\u4f4d\u4e8e\u5206\u914d\u7ed9slab\u7684\u7b2c\u4e00\u4e2a\u9875\u6846\u7684\u8d77\u59cb\u4f4d\u7f6e<\/p>\n
    struct kmem_cache\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2astruct array_cache\u6307\u9488\u6570\u7ec4\uff0c\u6570\u7ec4\u7684\u5143\u7d20\u4e2a\u6570\u5bf9\u5e94\u4e86\u7cfb\u7edf\u7684CPU\u6570\uff0c\u548c\u4f19\u4f34\u7cfb\u7edf\u4e2d\u7684\u6bcfCPU\u9875\u6846\u9ad8\u901f\u7f13\u5b58\u7c7b\u4f3c\uff0c\u8be5\u7ed3\u6784\u7528\u6765\u63cf\u8ff0\u6bcf\u4e2aCPU\u7684\u672c\u5730\u9ad8\u901f\u7f13\u5b58\uff0c\u5728\u6bcf\u4e2aarray_cache\u7684\u672b\u7aef\u90fd\u7528\u4e00\u4e2a\u6307\u9488\u6570\u7ec4\u8bb0\u5f55\u4e86slab\u4e2d\u7684\u7a7a\u95f2\u5bf9\u8c61\uff0c\u5206\u914d\u5bf9\u8c61\u65f6\uff0c\u91c7\u7528LIFO\u65b9\u5f0f\uff0c\u4e5f\u5c31\u662f\u5c06\u8be5\u6570\u7ec4\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u7d22\u5f15\u5bf9\u5e94\u7684\u5bf9\u8c61\u5206\u914d\u51fa\u53bb\uff0c\u4ee5\u4fdd\u8bc1\u8be5\u5bf9\u8c61\u8fd8\u9a7b\u7559\u5728\u9ad8\u901f\u7f13\u5b58\u4e2d\u7684\u53ef\u80fd\u6027\u3002\u5b9e\u9645\u4e0a\uff0c\u6bcf\u6b21\u5206\u914d\u5185\u5b58\u90fd\u662f\u76f4\u63a5\u4e0e\u672c\u5730CPU\u9ad8\u901f\u7f13\u5b58\u8fdb\u884c\u4ea4\u4e92\uff0c\u53ea\u6709\u5f53\u5176\u7a7a\u95f2\u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u624d\u4f1a\u4ecekmem_list\u4e2d\u7684slab\u4e2d\u5f15\u5165\u4e00\u90e8\u5206\u5bf9\u8c61\u5230\u672c\u5730\u9ad8\u901f\u7f13\u5b58\u4e2d\uff0c\u800ckmem_list\u4e2d\u7684\u7a7a\u95f2\u5bf9\u8c61\u4e5f\u4e0d\u8db3\u4e86\uff0c\u90a3\u4e48\u5c31\u8981\u4ece\u4f19\u4f34\u7cfb\u7edf\u4e2d\u5f15\u5165\u65b0\u7684\u9875\u6765\u5efa\u7acb\u65b0\u7684slab\u4e86\uff0c\u8fd9\u4e00\u70b9\u4e5f\u548c\u4f19\u4f34\u7cfb\u7edf\u7684
    \n\u6bcfCPU\u9875\u6846\u9ad8\u901f\u7f13\u5b58\u5f88\u7c7b\u4f3c\u3002<\/p>\n
    <\/code><\/pre>\n
      \n
    1. \n
      \n
      <\/div>\n<\/div>\n
      \n
      struct<\/span> array_cache<\/span> {<\/span><\/div>\n<\/div>\n<\/li>\n
    2. \n
      \n
      <\/div>\n<\/div>\n
      \n
      unsigned<\/span> int<\/span> avail;\/*\u672c\u5730\u9ad8\u901f\u7f13\u5b58\u4e2d\u53ef\u7528\u7684\u7a7a\u95f2\u5bf9\u8c61\u6570*\/<\/span><\/div>\n<\/div>\n<\/li>\n
    3. \n
      \n
      <\/div>\n<\/div>\n
      \n
      unsigned<\/span> int<\/span> limit;\/*\u7a7a\u95f2\u5bf9\u8c61\u7684\u4e0a\u9650*\/<\/span><\/div>\n<\/div>\n<\/li>\n
    4. \n
      \n
      <\/div>\n<\/div>\n
      \n
      unsigned<\/span> int<\/span> batchcount;\/*\u4e00\u6b21\u8f6c\u5165\u548c\u8f6c\u51fa\u7684\u5bf9\u8c61\u6570\u91cf*\/<\/span><\/div>\n<\/div>\n<\/li>\n
    5. \n
      \n
      <\/div>\n<\/div>\n
      \n
      unsigned<\/span> int<\/span> touched; \/*\u6807\u8bc6\u672c\u5730CPU\u6700\u8fd1\u662f\u5426\u88ab\u4f7f\u7528*\/<\/span><\/div>\n<\/div>\n<\/li>\n
    6. \n
      \n
      <\/div>\n<\/div>\n
      \n
      spinlock_t<\/span> lock;<\/div>\n<\/div>\n<\/li>\n
    7. \n
      \n
      <\/div>\n<\/div>\n
      \n
      void<\/span> *entry[]; \/*\u8fd9\u662f\u4e00\u4e2a\u4f2a\u6570\u7ec4\uff0c\u4fbf\u4e8e\u5bf9\u540e\u9762\u7528\u4e8e\u8ddf\u8e2a\u7a7a\u95f2\u5bf9\u8c61\u7684\u6307\u9488\u6570\u7ec4\u7684\u8bbf\u95ee <\/span><\/div>\n<\/div>\n<\/li>\n
    8. \n
      \n
      <\/div>\n<\/div>\n
      \n
       *\/<\/span><\/div>\n<\/div>\n<\/li>\n
    9. \n
      \n
      <\/div>\n<\/div>\n
      \n
      };<\/div>\n<\/div>\n<\/li>\n<\/ol>\n
      <\/code><\/pre>\n
      \u56e0\u6b64\uff0c\u5bf9\u8c61\u5206\u914d\u7684\u6b21\u5e8f\u4e3a\uff1a\uff081\uff09\u7279\u5b9a\u4e8eCPU\/\u8282\u70b9\u7684\u7f13\u5b58\u5217\u8868\u4e2d\u7684\u5bf9\u8c61\uff082\uff09\u5f53\u524d\u5df2\u7ecf\u5b58\u5728\u4e8eslab\u7f13\u5b58\u4e2d\u4e2d\u7684\u672a\u7528\u5bf9\u8c61\uff083\uff09\u4ece\u4f19\u4f34\u7cfb\u7edf\u83b7\u5f97\u5185\u5b58\uff0c\u7136\u540e\u521b\u5efa\u7684\u5bf9\u8c61<\/p>\n
      \u5bf9\u8c61\u5728slab\u4e2d\u4e0d\u662f\u8fde\u7eed\u6392\u5217\u7684\uff0c\u5176\u6392\u5217\u5982\u56fe\u6240\u793a:<\/p>\n
      \"\"<\/p>\n
      5,\u4f19\u4f34\u7cfb\u7edf slab\u5206\u914d\u5668\u7684\u5173\u7cfb<\/strong><\/p>\n
      \"\"
      \n\"\"<\/p>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"
      \u539f\u6587\u5730\u5740 http:\/\/blog.csd<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[119],"class_list":["post-4511","post","type-post","status-publish","format-standard","hentry","tag-03-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/4511","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=4511"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/4511\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=4511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=4511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=4511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}