{"id":1409,"date":"2026-10-26T02:00:00","date_gmt":"2026-10-25T17:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1409"},"modified":"2026-10-23T07:41:38","modified_gmt":"2026-10-22T22:41:38","slug":"qs-posix-fadvise-dontneed-page-boundary-20261023","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1409","title":{"rendered":"posix_fadvise\u306eDONTNEED\u3001\u7bc4\u56f2\u3092\u6307\u5b9a\u3057\u3066\u3082\u30ad\u30e3\u30c3\u30b7\u30e5\u89e3\u653e\u3092\u4fdd\u8a3c\u3067\u304d\u306a\u3044\u7406\u7531"},"content":{"rendered":"<p>\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u3092\u4e00\u5ea6\u3060\u3051\u8aad\u307f\u9032\u3081\u308b\u51e6\u7406\u3067\u306f\u3001\u8aad\u307f\u7d42\u308f\u3063\u305f\u90e8\u5206\u3088\u308a\u3082\u3001\u3053\u308c\u304b\u3089\u4f7f\u3046\u30c7\u30fc\u30bf\u3078\u30e1\u30e2\u30ea\u30fc\u3092\u56de\u3057\u305f\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002Linux\u3067\u4f7f\u3048\u308bposix_fadvise\u306eDONTNEED\u306f\u3001\u305d\u306e\u610f\u56f3\u3092\u30ab\u30fc\u30cd\u30eb\u3078\u4f1d\u3048\u308b\u65b9\u6cd5\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u6307\u5b9a\u3057\u305f\u30d0\u30a4\u30c8\u6570\u304c\u305d\u306e\u307e\u307e\u89e3\u653e\u91cf\u306b\u306a\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u7bc4\u56f2\u306e\u5883\u754c\u3001\u30da\u30fc\u30b8\u306e\u72b6\u614b\u3001\u51e6\u7406\u7d50\u679c\u3092\u5206\u3051\u308b\u3068\u3001\u3053\u306e\u6a5f\u80fd\u3092\u904e\u5927\u8a55\u4fa1\u305b\u305a\u306b\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<section 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\u30da\u30fc\u30b80\u30842\u3092\u4e38\u3054\u3068\u6368\u3066\u308c\u3070\u3001\u6307\u5b9a\u7bc4\u56f2\u306e\u5916\u306b\u3042\u308b\u90e8\u5206\u307e\u3067\u5dfb\u304d\u8fbc\u307f\u307e\u3059\u3002\u30d0\u30a4\u30c8\u7bc4\u56f2\u306e\u9014\u4e2d\u304b\u3089\u9014\u4e2d\u307e\u3067\u3092\u6307\u5b9a\u3067\u304d\u308b\u3053\u3068\u3068\u3001\u305d\u306e\u7aef\u306e\u30da\u30fc\u30b8\u3082\u4e38\u3054\u3068\u89e3\u653e\u5bfe\u8c61\u306b\u306a\u308b\u3053\u3068\u306f\u5225\u3067\u3059\u3002<\/p>\n<p>\u72ec\u81ea\u30e2\u30c7\u30eb\u3067\u306f\u3001\u5404\u30da\u30fc\u30b8\u306e\u958b\u59cb\u304c\u8981\u6c42\u306e\u958b\u59cb\u4ee5\u4e0a\u3067\u3042\u308a\u3001\u30da\u30fc\u30b8\u306e\u7d42\u7aef\u304c\u8981\u6c42\u306e\u7d42\u7aef\u4ee5\u4e0b\u3067\u3042\u308b\u3082\u306e\u3060\u3051\u3092\u6570\u3048\u3066\u3044\u307e\u3059\u3002\u540c\u30584096\u30d0\u30a4\u30c8\u306e\u9577\u3055\u3067\u3082\u30014096\u304b\u30898192\u672a\u6e80\u306a\u30891\u30da\u30fc\u30b8\u5168\u4f53\u304c\u5165\u308b\u4e00\u65b9\u30015000\u304b\u30899096\u672a\u6e80\u3067\u306f\u4e8c\u3064\u306e\u30da\u30fc\u30b8\u306b\u307e\u305f\u304c\u308a\u3001\u4e38\u3054\u3068\u5165\u308b\u30da\u30fc\u30b8\u306f0\u3067\u3059\u3002\u9577\u3055\u3060\u3051\u3067\u306f\u5019\u88dc\u6570\u3092\u5224\u65ad\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<figure><img 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style=\"width:100%;max-width:100%;height:auto\"><figcaption>\u30da\u30fc\u30b8\u30b5\u30a4\u30ba\u30924096\u30d0\u30a4\u30c8\u3068\u4eee\u5b9a\u3057\u305f\u72ec\u81ea\u306e\u7bc4\u56f2\u6bd4\u8f03\u3002\u5019\u88dc\u3068\u3057\u3066\u6570\u3048\u3089\u308c\u308b\u3053\u3068\u3068\u3001\u5b9f\u969b\u306b\u89e3\u653e\u3055\u308c\u305f\u3053\u3068\u3092\u5206\u3051\u308b\u3002<\/figcaption><\/figure>\n<h2>\u5883\u754c\u304c\u5408\u3063\u3066\u3044\u3066\u3082\u3001\u672a\u66f8\u304d\u51fa\u3057\u306e\u5909\u66f4\u306f\u6b8b\u308b<\/h2>\n<p>\u6b21\u306b\u30010\u4ee5\u4e0a12288\u672a\u6e80\u3092\u6307\u5b9a\u3059\u308b\u4f8b\u3092\u8003\u3048\u307e\u3059\u3002\u4eca\u5ea6\u306f\u4e09\u3064\u306e\u30da\u30fc\u30b8\u5168\u4f53\u304c\u5165\u308a\u3001\u7bc4\u56f2\u3060\u3051\u3092\u898b\u308c\u3070\u5019\u88dc\u306f3\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u30da\u30fc\u30b81\u306b\u5909\u66f4\u5f8c\u307e\u3060\u66f8\u304d\u51fa\u3055\u308c\u3066\u3044\u306a\u3044\u30c7\u30fc\u30bf\u304c\u3042\u308b\u3068\u4eee\u5b9a\u3059\u308c\u3070\u3001\u540c\u3058\u7d50\u8ad6\u306b\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u30de\u30cb\u30e5\u30a2\u30eb\u306b\u3088\u308b\u3068\u3001\u5b9f\u88c5\u304c\u305d\u306e\u7bc4\u56f2\u306edirty page\u3001\u3064\u307e\u308a\u66f8\u304d\u51fa\u3059\u3079\u304d\u5909\u66f4\u3092\u6301\u3064\u30da\u30fc\u30b8\u306e\u66f8\u304d\u623b\u3057\u3092\u8a66\u307f\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u4fdd\u8a3c\u3055\u308c\u307e\u305b\u3093\u3002\u672a\u66f8\u304d\u51fa\u3057\u306edirty page\u306f\u89e3\u653e\u3055\u308c\u307e\u305b\u3093\u3002[1] \u3053\u306e\u5236\u7d04\u3092\u72ec\u81ea\u30e2\u30c7\u30eb\u3078\u52a0\u3048\u308b\u3068\u3001\u4e09\u3064\u306e\u3046\u3061\u30da\u30fc\u30b81\u3092\u9664\u3044\u305f\u30da\u30fc\u30b80\u30682\u306e\u4e8c\u3064\u304c\u3001\u7bc4\u56f2\u3068\u672a\u66f8\u304d\u51fa\u3057\u72b6\u614b\u306e\u4e21\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5019\u88dc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u300c\u5019\u88dc2\u300d\u306f\u30012\u30da\u30fc\u30b8\u304c\u5b9f\u969b\u306b\u6d88\u3048\u305f\u3068\u3044\u3046\u89b3\u6e2c\u5024\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e2\u30c7\u30eb\u306f\u30da\u30fc\u30b8\u306e\u5883\u754c\u3068dirty\u72b6\u614b\u3060\u3051\u3092\u5165\u529b\u306b\u3057\u3066\u304a\u308a\u3001\u5b9f\u30ab\u30fc\u30cd\u30eb\u306e\u72b6\u614b\u3084\u4ed6\u306e\u51e6\u7406\u3092\u518d\u73fe\u3057\u3066\u3044\u306a\u3044\u305f\u3081\u3067\u3059\u3002\u8cc7\u6599\u306f\u66f8\u304d\u623b\u3057\u304c\u5fc5\u8981\u306a\u5834\u5408\u306efsync\u3084fdatasync\u306b\u3082\u89e6\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u66f8\u304d\u623b\u3057\u3092\u5f85\u3064\u51e6\u7406\u3092\u52a0\u3048\u308c\u3070\u3001\u5143\u306e\u51e6\u7406\u306e\u5f85\u3061\u6642\u9593\u3084\u30a8\u30e9\u30fc\u51e6\u7406\u3082\u8003\u3048\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u672c\u7a3f\u306e\u4f8b\u304b\u3089\u4e00\u5f8b\u306b\u8ffd\u52a0\u3059\u3079\u304d\u64cd\u4f5c\u3068\u306f\u6c7a\u3081\u3089\u308c\u307e\u305b\u3093\u3002<\/p>\n<h2>\u623b\u308a\u5024\u3068\u89e3\u653e\u91cf\u3092\u3001\u5225\u306e\u554f\u3044\u3068\u3057\u3066\u6271\u3046<\/h2>\n<p>posix_fadvise\u306f\u6210\u529f\u6642\u306b0\u3001\u30a8\u30e9\u30fc\u6642\u306b\u306f\u30a8\u30e9\u30fc\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\u3002[1\u3001RETURN VALUE] \u8fd4\u3059\u6570\u5b57\u306f\u89e3\u653e\u3057\u305f\u30d0\u30a4\u30c8\u6570\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u30020\u3060\u3063\u305f\u304b\u30899000\u30d0\u30a4\u30c8\u89e3\u653e\u3055\u308c\u305f\u3001\u3068\u8aad\u3093\u3060\u308a\u3001\u8fd4\u3055\u308c\u305f\u6570\u3092\u51e6\u7406\u6e08\u307f\u30d0\u30a4\u30c8\u6570\u3068\u3057\u3066\u8db3\u3057\u5408\u308f\u305b\u305f\u308a\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u78ba\u8a8d\u3057\u305f\u3044\u3053\u3068\u3092\u4e09\u6bb5\u968e\u306b\u3059\u308b\u3068\u6574\u7406\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u7b2c\u4e00\u306b\u3001\u547c\u3073\u51fa\u3057\u304c\u30a8\u30e9\u30fc\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u304b\u3002\u7b2c\u4e8c\u306b\u3001\u7bc4\u56f2\u306f\u3069\u306e\u30da\u30fc\u30b8\u3092\u4e38\u3054\u3068\u542b\u307f\u3001\u672a\u66f8\u304d\u51fa\u3057\u306e\u5909\u66f4\u3068\u3044\u3046\u5236\u7d04\u304c\u306a\u3044\u304b\u3002\u7b2c\u4e09\u306b\u3001\u5b9f\u969b\u306e\u5bfe\u8c61\u74b0\u5883\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u3084\u51e6\u7406\u6642\u9593\u304c\u3069\u3046\u5909\u308f\u3063\u305f\u304b\u3067\u3059\u3002\u672c\u7a3f\u306e\u8a08\u7b97\u304c\u6271\u3046\u306e\u306f\u7b2c\u4e8c\u6bb5\u968e\u306e\u4e00\u90e8\u3067\u3059\u3002\u7b2c\u4e00\u6bb5\u968e\u306e\u6210\u529f\u3092\u7b2c\u4e09\u6bb5\u968e\u306e\u6210\u679c\u306b\u7f6e\u304d\u63db\u3048\u307e\u305b\u3093\u3002<\/p>\n<p>\u307e\u305f\u3001\u7aef\u6570\u3092\u306a\u304f\u3059\u305f\u3081\u306b\u958b\u59cb\u3092\u524d\u3078\u3001\u7d42\u7aef\u3092\u5f8c\u308d\u3078\u5e83\u3052\u308c\u3070\u3001\u3082\u3068\u3082\u3068\u6307\u5b9a\u3057\u3066\u3044\u306a\u304b\u3063\u305f\u9818\u57df\u307e\u3067\u542b\u307e\u308c\u307e\u3059\u3002\u30da\u30fc\u30b8\u5883\u754c\u3078\u5408\u308f\u305b\u308b\u3053\u3068\u81ea\u4f53\u3092\u76ee\u7684\u306b\u305b\u305a\u3001\u305d\u306e\u8ffd\u52a0\u9818\u57df\u3082\u672c\u5f53\u306b\u8fd1\u304f\u4f7f\u308f\u306a\u3044\u306e\u304b\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u8aad\u307f\u7d42\u3048\u305f\u533a\u9593\u306e\u7ba1\u7406\u3068\u518d\u5229\u7528\u4e88\u5b9a\u3092\u5148\u306b\u5b9a\u3081\u3001\u305d\u308c\u306b\u5408\u3046\u7bc4\u56f2\u3067\u52a9\u8a00\u3059\u308b\u65b9\u304c\u3001\u5358\u306b\u5927\u304d\u306a\u6570\u5b57\u3092\u6307\u5b9a\u3059\u308b\u3088\u308a\u5224\u65ad\u306e\u6839\u62e0\u3092\u660e\u78ba\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u51fa\u5178<\/h2>\n<ol>\n<li>Linux man-pages 6.19, <a href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/posix_fadvise.2.html\">posix_fadvise(2)<\/a>\u3002\u30da\u30fc\u30b8\u65e5\u4ed82026\u5e742\u67088\u65e5\u3001HTML\u72482026\u5e749\u67089\u65e5\u3002DESCRIPTION\u3001POSIX_FADV_DONTNEED\u3001RETURN VALUE\u30022026\u5e7410\u670823\u65e5\u78ba\u8a8d\u30024096\u30d0\u30a4\u30c8\u3092\u4eee\u5b9a\u3057\u305f\u7bc4\u56f2\u4f8b\u3068\u56f3\u306f\u72ec\u81ea\u4f5c\u6210\u3002\u5b9f\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u89e3\u653e\u91cf\u3001\u5b9f\u6a5f\u6027\u80fd\u3001\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u306e\u6319\u52d5\u3092\u6e2c\u5b9a\u3057\u305f\u3082\u306e\u3067\u306f\u306a\u3044\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u3092\u4e00\u5ea6\u3060\u3051\u8aad\u307f\u9032\u3081\u308b\u51e6\u7406\u3067\u306f\u3001\u8aad\u307f\u7d42\u308f\u3063\u305f\u90e8\u5206\u3088\u308a\u3082\u3001\u3053\u308c\u304b\u3089\u4f7f\u3046\u30c7\u30fc\u30bf\u3078\u30e1\u30e2\u30ea\u30fc\u3092\u56de\u3057\u305f\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002Linux\u3067\u4f7f\u3048\u308bposix_fadvise\u306eDONTNEED\u306f\u3001\u305d\u306e\u610f\u56f3\u3092\u30ab\u30fc\u30cd\u30eb\u3078\u4f1d\u3048\u308b\u65b9\u6cd5\u3067 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1407,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[30],"tags":[244],"class_list":["post-1409","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-computing","tag-linux"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-posix-fadvise-dontneed-page-boundary-20261023-featured-2769987c9018.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1409","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1409"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1409\/revisions"}],"predecessor-version":[{"id":1410,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1409\/revisions\/1410"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1407"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1409"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1409"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}